Separate format conversion DSP functions from DSPContext.

This will be beneficial for use with the audio conversion API without
requiring it to depend on all of dsputil.

Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit c73d99e672329c8f2df290736ffc474c360ac4ae)

8 files changed, 521 insertions, 434 deletions

diff --git a/libavcodec/arm/Makefile b/libavcodec/arm/Makefile
index 4c30e0ab9f..014456ee32 100644
--- a/libavcodec/arm/Makefile
+++ b/libavcodec/arm/Makefile
@@ -9,6 +9,7 @@ OBJS-$(CONFIG_H264PRED)                += arm/h264pred_init_arm.o
 OBJS                                   += arm/dsputil_init_arm.o        \
                                           arm/dsputil_arm.o             \
                                           arm/fft_init_arm.o            \
+                                          arm/fmtconvert_init_arm.o     \
                                           arm/jrevdct_arm.o             \
                                           arm/mpegvideo_arm.o           \
                                           arm/simple_idct_arm.o         \
@@ -22,8 +23,11 @@ OBJS-$(HAVE_ARMV6)                     += arm/dsputil_init_armv6.o      \
                                           arm/dsputil_armv6.o           \
                                           arm/simple_idct_armv6.o       \
 
+VFP-OBJS-$(HAVE_ARMV6)                 += arm/fmtconvert_vfp.o          \
+
 OBJS-$(HAVE_ARMVFP)                    += arm/dsputil_vfp.o             \
                                           arm/dsputil_init_vfp.o        \
+                                          $(VFP-OBJS-yes)
 
 OBJS-$(HAVE_IWMMXT)                    += arm/dsputil_iwmmxt.o          \
                                           arm/mpegvideo_iwmmxt.o        \
@@ -52,6 +56,7 @@ NEON-OBJS-$(CONFIG_VP6_DECODER)        += arm/vp56dsp_neon.o            \
 
 OBJS-$(HAVE_NEON)                      += arm/dsputil_init_neon.o       \
                                           arm/dsputil_neon.o            \
+                                          arm/fmtconvert_neon.o         \
                                           arm/int_neon.o                \
                                           arm/mpegvideo_neon.o          \
                                           arm/simple_idct_neon.o        \
diff --git a/libavcodec/arm/dsputil_init_neon.c b/libavcodec/arm/dsputil_init_neon.c
index 67982048f9..76ae632273 100644
--- a/libavcodec/arm/dsputil_init_neon.c
+++ b/libavcodec/arm/dsputil_init_neon.c
@@ -153,8 +153,6 @@ void ff_sv_fmul_scalar_4_neon(float *dst, const float **vp, float mul,
                               int len);
 void ff_butterflies_float_neon(float *v1, float *v2, int len);
 float ff_scalarproduct_float_neon(const float *v1, const float *v2, int len);
-void ff_int32_to_float_fmul_scalar_neon(float *dst, const int *src,
-                                        float mul, int len);
 void ff_vector_fmul_reverse_neon(float *dst, const float *src0,
                                  const float *src1, int len);
 void ff_vector_fmul_add_neon(float *dst, const float *src0, const float *src1,
@@ -162,8 +160,6 @@ void ff_vector_fmul_add_neon(float *dst, const float *src0, const float *src1,
 
 void ff_vector_clipf_neon(float *dst, const float *src, float min, float max,
                           int len);
-void ff_float_to_int16_neon(int16_t *, const float *, long);
-void ff_float_to_int16_interleave_neon(int16_t *, const float **, long, int);
 
 void ff_vorbis_inverse_coupling_neon(float *mag, float *ang, int blocksize);
 
@@ -308,7 +304,6 @@ void ff_dsputil_init_neon(DSPContext *c, AVCodecContext *avctx)
     c->vector_fmul_scalar         = ff_vector_fmul_scalar_neon;
     c->butterflies_float          = ff_butterflies_float_neon;
     c->scalarproduct_float        = ff_scalarproduct_float_neon;
-    c->int32_to_float_fmul_scalar = ff_int32_to_float_fmul_scalar_neon;
     c->vector_fmul_reverse        = ff_vector_fmul_reverse_neon;
     c->vector_fmul_add            = ff_vector_fmul_add_neon;
     c->vector_clipf               = ff_vector_clipf_neon;
@@ -319,11 +314,6 @@ void ff_dsputil_init_neon(DSPContext *c, AVCodecContext *avctx)
     c->sv_fmul_scalar[0] = ff_sv_fmul_scalar_2_neon;
     c->sv_fmul_scalar[1] = ff_sv_fmul_scalar_4_neon;
 
-    if (!(avctx->flags & CODEC_FLAG_BITEXACT)) {
-        c->float_to_int16            = ff_float_to_int16_neon;
-        c->float_to_int16_interleave = ff_float_to_int16_interleave_neon;
-    }
-
     if (CONFIG_VORBIS_DECODER)
         c->vorbis_inverse_coupling = ff_vorbis_inverse_coupling_neon;
 
diff --git a/libavcodec/arm/dsputil_init_vfp.c b/libavcodec/arm/dsputil_init_vfp.c
index 76ef6b4171..bd52315934 100644
--- a/libavcodec/arm/dsputil_init_vfp.c
+++ b/libavcodec/arm/dsputil_init_vfp.c
@@ -25,13 +25,9 @@ void ff_vector_fmul_vfp(float *dst, const float *src0,
                         const float *src1, int len);
 void ff_vector_fmul_reverse_vfp(float *dst, const float *src0,
                                 const float *src1, int len);
-void ff_float_to_int16_vfp(int16_t *dst, const float *src, long len);
 
 void ff_dsputil_init_vfp(DSPContext* c, AVCodecContext *avctx)
 {
     c->vector_fmul = ff_vector_fmul_vfp;
     c->vector_fmul_reverse = ff_vector_fmul_reverse_vfp;
-#if HAVE_ARMV6
-    c->float_to_int16 = ff_float_to_int16_vfp;
-#endif
 }
diff --git a/libavcodec/arm/dsputil_neon.S b/libavcodec/arm/dsputil_neon.S
index 8329f6cc57..05a911502b 100644
--- a/libavcodec/arm/dsputil_neon.S
+++ b/libavcodec/arm/dsputil_neon.S
@@ -400,343 +400,6 @@ function ff_add_pixels_clamped_neon, export=1
         bx              lr
 endfunc
 
-function ff_float_to_int16_neon, export=1
-        subs            r2,  r2,  #8
-        vld1.64         {d0-d1},  [r1,:128]!
-        vcvt.s32.f32    q8,  q0,  #16
-        vld1.64         {d2-d3},  [r1,:128]!
-        vcvt.s32.f32    q9,  q1,  #16
-        beq             3f
-        bics            ip,  r2,  #15
-        beq             2f
-1:      subs            ip,  ip,  #16
-        vshrn.s32       d4,  q8,  #16
-        vld1.64         {d0-d1},  [r1,:128]!
-        vcvt.s32.f32    q0,  q0,  #16
-        vshrn.s32       d5,  q9,  #16
-        vld1.64         {d2-d3},  [r1,:128]!
-        vcvt.s32.f32    q1,  q1,  #16
-        vshrn.s32       d6,  q0,  #16
-        vst1.64         {d4-d5},  [r0,:128]!
-        vshrn.s32       d7,  q1,  #16
-        vld1.64         {d16-d17},[r1,:128]!
-        vcvt.s32.f32    q8,  q8,  #16
-        vld1.64         {d18-d19},[r1,:128]!
-        vcvt.s32.f32    q9,  q9,  #16
-        vst1.64         {d6-d7},  [r0,:128]!
-        bne             1b
-        ands            r2,  r2,  #15
-        beq             3f
-2:      vld1.64         {d0-d1},  [r1,:128]!
-        vshrn.s32       d4,  q8,  #16
-        vcvt.s32.f32    q0,  q0,  #16
-        vld1.64         {d2-d3},  [r1,:128]!
-        vshrn.s32       d5,  q9,  #16
-        vcvt.s32.f32    q1,  q1,  #16
-        vshrn.s32       d6,  q0,  #16
-        vst1.64         {d4-d5},  [r0,:128]!
-        vshrn.s32       d7,  q1,  #16
-        vst1.64         {d6-d7},  [r0,:128]!
-        bx              lr
-3:      vshrn.s32       d4,  q8,  #16
-        vshrn.s32       d5,  q9,  #16
-        vst1.64         {d4-d5},  [r0,:128]!
-        bx              lr
-endfunc
-
-function ff_float_to_int16_interleave_neon, export=1
-        cmp             r3, #2
-        ldrlt           r1, [r1]
-        blt             ff_float_to_int16_neon
-        bne             4f
-
-        ldr             r3, [r1]
-        ldr             r1, [r1, #4]
-
-        subs            r2,  r2,  #8
-        vld1.64         {d0-d1},  [r3,:128]!
-        vcvt.s32.f32    q8,  q0,  #16
-        vld1.64         {d2-d3},  [r3,:128]!
-        vcvt.s32.f32    q9,  q1,  #16
-        vld1.64         {d20-d21},[r1,:128]!
-        vcvt.s32.f32    q10, q10, #16
-        vld1.64         {d22-d23},[r1,:128]!
-        vcvt.s32.f32    q11, q11, #16
-        beq             3f
-        bics            ip,  r2,  #15
-        beq             2f
-1:      subs            ip,  ip,  #16
-        vld1.64         {d0-d1},  [r3,:128]!
-        vcvt.s32.f32    q0,  q0,  #16
-        vsri.32         q10, q8,  #16
-        vld1.64         {d2-d3},  [r3,:128]!
-        vcvt.s32.f32    q1,  q1,  #16
-        vld1.64         {d24-d25},[r1,:128]!
-        vcvt.s32.f32    q12, q12, #16
-        vld1.64         {d26-d27},[r1,:128]!
-        vsri.32         q11, q9,  #16
-        vst1.64         {d20-d21},[r0,:128]!
-        vcvt.s32.f32    q13, q13, #16
-        vst1.64         {d22-d23},[r0,:128]!
-        vsri.32         q12, q0,  #16
-        vld1.64         {d16-d17},[r3,:128]!
-        vsri.32         q13, q1,  #16
-        vst1.64         {d24-d25},[r0,:128]!
-        vcvt.s32.f32    q8,  q8,  #16
-        vld1.64         {d18-d19},[r3,:128]!
-        vcvt.s32.f32    q9,  q9,  #16
-        vld1.64         {d20-d21},[r1,:128]!
-        vcvt.s32.f32    q10, q10, #16
-        vld1.64         {d22-d23},[r1,:128]!
-        vcvt.s32.f32    q11, q11, #16
-        vst1.64         {d26-d27},[r0,:128]!
-        bne             1b
-        ands            r2,  r2,  #15
-        beq             3f
-2:      vsri.32         q10, q8,  #16
-        vld1.64         {d0-d1},  [r3,:128]!
-        vcvt.s32.f32    q0,  q0,  #16
-        vld1.64         {d2-d3},  [r3,:128]!
-        vcvt.s32.f32    q1,  q1,  #16
-        vld1.64         {d24-d25},[r1,:128]!
-        vcvt.s32.f32    q12, q12, #16
-        vsri.32         q11, q9,  #16
-        vld1.64         {d26-d27},[r1,:128]!
-        vcvt.s32.f32    q13, q13, #16
-        vst1.64         {d20-d21},[r0,:128]!
-        vsri.32         q12, q0,  #16
-        vst1.64         {d22-d23},[r0,:128]!
-        vsri.32         q13, q1,  #16
-        vst1.64         {d24-d27},[r0,:128]!
-        bx              lr
-3:      vsri.32         q10, q8,  #16
-        vsri.32         q11, q9,  #16
-        vst1.64         {d20-d23},[r0,:128]!
-        bx              lr
-
-4:      push            {r4-r8,lr}
-        cmp             r3,  #4
-        lsl             ip,  r3,  #1
-        blt             4f
-
-        @ 4 channels
-5:      ldmia           r1!, {r4-r7}
-        mov             lr,  r2
-        mov             r8,  r0
-        vld1.64         {d16-d17},[r4,:128]!
-        vcvt.s32.f32    q8,  q8,  #16
-        vld1.64         {d18-d19},[r5,:128]!
-        vcvt.s32.f32    q9,  q9,  #16
-        vld1.64         {d20-d21},[r6,:128]!
-        vcvt.s32.f32    q10, q10, #16
-        vld1.64         {d22-d23},[r7,:128]!
-        vcvt.s32.f32    q11, q11, #16
-6:      subs            lr,  lr,  #8
-        vld1.64         {d0-d1},  [r4,:128]!
-        vcvt.s32.f32    q0,  q0,  #16
-        vsri.32         q9,  q8,  #16
-        vld1.64         {d2-d3},  [r5,:128]!
-        vcvt.s32.f32    q1,  q1,  #16
-        vsri.32         q11, q10, #16
-        vld1.64         {d4-d5},  [r6,:128]!
-        vcvt.s32.f32    q2,  q2,  #16
-        vzip.32         d18, d22
-        vld1.64         {d6-d7},  [r7,:128]!
-        vcvt.s32.f32    q3,  q3,  #16
-        vzip.32         d19, d23
-        vst1.64         {d18},    [r8], ip
-        vsri.32         q1,  q0,  #16
-        vst1.64         {d22},    [r8], ip
-        vsri.32         q3,  q2,  #16
-        vst1.64         {d19},    [r8], ip
-        vzip.32         d2,  d6
-        vst1.64         {d23},    [r8], ip
-        vzip.32         d3,  d7
-        beq             7f
-        vld1.64         {d16-d17},[r4,:128]!
-        vcvt.s32.f32    q8,  q8,  #16
-        vst1.64         {d2},     [r8], ip
-        vld1.64         {d18-d19},[r5,:128]!
-        vcvt.s32.f32    q9,  q9,  #16
-        vst1.64         {d6},     [r8], ip
-        vld1.64         {d20-d21},[r6,:128]!
-        vcvt.s32.f32    q10, q10, #16
-        vst1.64         {d3},     [r8], ip
-        vld1.64         {d22-d23},[r7,:128]!
-        vcvt.s32.f32    q11, q11, #16
-        vst1.64         {d7},     [r8], ip
-        b               6b
-7:      vst1.64         {d2},     [r8], ip
-        vst1.64         {d6},     [r8], ip
-        vst1.64         {d3},     [r8], ip
-        vst1.64         {d7},     [r8], ip
-        subs            r3,  r3,  #4
-        popeq           {r4-r8,pc}
-        cmp             r3,  #4
-        add             r0,  r0,  #8
-        bge             5b
-
-        @ 2 channels
-4:      cmp             r3,  #2
-        blt             4f
-        ldmia           r1!, {r4-r5}
-        mov             lr,  r2
-        mov             r8,  r0
-        tst             lr,  #8
-        vld1.64         {d16-d17},[r4,:128]!
-        vcvt.s32.f32    q8,  q8,  #16
-        vld1.64         {d18-d19},[r5,:128]!
-        vcvt.s32.f32    q9,  q9,  #16
-        vld1.64         {d20-d21},[r4,:128]!
-        vcvt.s32.f32    q10, q10, #16
-        vld1.64         {d22-d23},[r5,:128]!
-        vcvt.s32.f32    q11, q11, #16
-        beq             6f
-        subs            lr,  lr,  #8
-        beq             7f
-        vsri.32         d18, d16, #16
-        vsri.32         d19, d17, #16
-        vld1.64         {d16-d17},[r4,:128]!
-        vcvt.s32.f32    q8,  q8,  #16
-        vst1.32         {d18[0]}, [r8], ip
-        vsri.32         d22, d20, #16
-        vst1.32         {d18[1]}, [r8], ip
-        vsri.32         d23, d21, #16
-        vst1.32         {d19[0]}, [r8], ip
-        vst1.32         {d19[1]}, [r8], ip
-        vld1.64         {d18-d19},[r5,:128]!
-        vcvt.s32.f32    q9,  q9,  #16
-        vst1.32         {d22[0]}, [r8], ip
-        vst1.32         {d22[1]}, [r8], ip
-        vld1.64         {d20-d21},[r4,:128]!
-        vcvt.s32.f32    q10, q10, #16
-        vst1.32         {d23[0]}, [r8], ip
-        vst1.32         {d23[1]}, [r8], ip
-        vld1.64         {d22-d23},[r5,:128]!
-        vcvt.s32.f32    q11, q11, #16
-6:      subs            lr,  lr,  #16
-        vld1.64         {d0-d1},  [r4,:128]!
-        vcvt.s32.f32    q0,  q0,  #16
-        vsri.32         d18, d16, #16
-        vld1.64         {d2-d3},  [r5,:128]!
-        vcvt.s32.f32    q1,  q1,  #16
-        vsri.32         d19, d17, #16
-        vld1.64         {d4-d5},  [r4,:128]!
-        vcvt.s32.f32    q2,  q2,  #16
-        vld1.64         {d6-d7},  [r5,:128]!
-        vcvt.s32.f32    q3,  q3,  #16
-        vst1.32         {d18[0]}, [r8], ip
-        vsri.32         d22, d20, #16
-        vst1.32         {d18[1]}, [r8], ip
-        vsri.32         d23, d21, #16
-        vst1.32         {d19[0]}, [r8], ip
-        vsri.32         d2,  d0,  #16
-        vst1.32         {d19[1]}, [r8], ip
-        vsri.32         d3,  d1,  #16
-        vst1.32         {d22[0]}, [r8], ip
-        vsri.32         d6,  d4,  #16
-        vst1.32         {d22[1]}, [r8], ip
-        vsri.32         d7,  d5,  #16
-        vst1.32         {d23[0]}, [r8], ip
-        vst1.32         {d23[1]}, [r8], ip
-        beq             6f
-        vld1.64         {d16-d17},[r4,:128]!
-        vcvt.s32.f32    q8,  q8,  #16
-        vst1.32         {d2[0]},  [r8], ip
-        vst1.32         {d2[1]},  [r8], ip
-        vld1.64         {d18-d19},[r5,:128]!
-        vcvt.s32.f32    q9,  q9,  #16
-        vst1.32         {d3[0]},  [r8], ip
-        vst1.32         {d3[1]},  [r8], ip
-        vld1.64         {d20-d21},[r4,:128]!
-        vcvt.s32.f32    q10, q10, #16
-        vst1.32         {d6[0]},  [r8], ip
-        vst1.32         {d6[1]},  [r8], ip
-        vld1.64         {d22-d23},[r5,:128]!
-        vcvt.s32.f32    q11, q11, #16
-        vst1.32         {d7[0]},  [r8], ip
-        vst1.32         {d7[1]},  [r8], ip
-        bgt             6b
-6:      vst1.32         {d2[0]},  [r8], ip
-        vst1.32         {d2[1]},  [r8], ip
-        vst1.32         {d3[0]},  [r8], ip
-        vst1.32         {d3[1]},  [r8], ip
-        vst1.32         {d6[0]},  [r8], ip
-        vst1.32         {d6[1]},  [r8], ip
-        vst1.32         {d7[0]},  [r8], ip
-        vst1.32         {d7[1]},  [r8], ip
-        b               8f
-7:      vsri.32         d18, d16, #16
-        vsri.32         d19, d17, #16
-        vst1.32         {d18[0]}, [r8], ip
-        vsri.32         d22, d20, #16
-        vst1.32         {d18[1]}, [r8], ip
-        vsri.32         d23, d21, #16
-        vst1.32         {d19[0]}, [r8], ip
-        vst1.32         {d19[1]}, [r8], ip
-        vst1.32         {d22[0]}, [r8], ip
-        vst1.32         {d22[1]}, [r8], ip
-        vst1.32         {d23[0]}, [r8], ip
-        vst1.32         {d23[1]}, [r8], ip
-8:      subs            r3,  r3,  #2
-        add             r0,  r0,  #4
-        popeq           {r4-r8,pc}
-
-        @ 1 channel
-4:      ldr             r4,  [r1],#4
-        tst             r2,  #8
-        mov             lr,  r2
-        mov             r5,  r0
-        vld1.64         {d0-d1},  [r4,:128]!
-        vcvt.s32.f32    q0,  q0,  #16
-        vld1.64         {d2-d3},  [r4,:128]!
-        vcvt.s32.f32    q1,  q1,  #16
-        bne             8f
-6:      subs            lr,  lr,  #16
-        vld1.64         {d4-d5},  [r4,:128]!
-        vcvt.s32.f32    q2,  q2,  #16
-        vld1.64         {d6-d7},  [r4,:128]!
-        vcvt.s32.f32    q3,  q3,  #16
-        vst1.16         {d0[1]},  [r5,:16], ip
-        vst1.16         {d0[3]},  [r5,:16], ip
-        vst1.16         {d1[1]},  [r5,:16], ip
-        vst1.16         {d1[3]},  [r5,:16], ip
-        vst1.16         {d2[1]},  [r5,:16], ip
-        vst1.16         {d2[3]},  [r5,:16], ip
-        vst1.16         {d3[1]},  [r5,:16], ip
-        vst1.16         {d3[3]},  [r5,:16], ip
-        beq             7f
-        vld1.64         {d0-d1},  [r4,:128]!
-        vcvt.s32.f32    q0,  q0,  #16
-        vld1.64         {d2-d3},  [r4,:128]!
-        vcvt.s32.f32    q1,  q1,  #16
-7:      vst1.16         {d4[1]},  [r5,:16], ip
-        vst1.16         {d4[3]},  [r5,:16], ip
-        vst1.16         {d5[1]},  [r5,:16], ip
-        vst1.16         {d5[3]},  [r5,:16], ip
-        vst1.16         {d6[1]},  [r5,:16], ip
-        vst1.16         {d6[3]},  [r5,:16], ip
-        vst1.16         {d7[1]},  [r5,:16], ip
-        vst1.16         {d7[3]},  [r5,:16], ip
-        bgt             6b
-        pop             {r4-r8,pc}
-8:      subs            lr,  lr,  #8
-        vst1.16         {d0[1]},  [r5,:16], ip
-        vst1.16         {d0[3]},  [r5,:16], ip
-        vst1.16         {d1[1]},  [r5,:16], ip
-        vst1.16         {d1[3]},  [r5,:16], ip
-        vst1.16         {d2[1]},  [r5,:16], ip
-        vst1.16         {d2[3]},  [r5,:16], ip
-        vst1.16         {d3[1]},  [r5,:16], ip
-        vst1.16         {d3[3]},  [r5,:16], ip
-        popeq           {r4-r8,pc}
-        vld1.64         {d0-d1},  [r4,:128]!
-        vcvt.s32.f32    q0,  q0,  #16
-        vld1.64         {d2-d3},  [r4,:128]!
-        vcvt.s32.f32    q1,  q1,  #16
-        b               6b
-endfunc
-
 function ff_vector_fmul_neon, export=1
         subs            r3,  r3,  #8
         vld1.64         {d0-d3},  [r1,:128]!
@@ -1050,34 +713,6 @@ NOVFP   vmov.32         r0,  d0[0]
         bx              lr
 endfunc
 
-function ff_int32_to_float_fmul_scalar_neon, export=1
-VFP     vdup.32         q0,  d0[0]
-VFP     len     .req    r2
-NOVFP   vdup.32         q0,  r2
-NOVFP   len     .req    r3
-
-        vld1.32         {q1},[r1,:128]!
-        vcvt.f32.s32    q3,  q1
-        vld1.32         {q2},[r1,:128]!
-        vcvt.f32.s32    q8,  q2
-1:      subs            len, len, #8
-        pld             [r1, #16]
-        vmul.f32        q9,  q3,  q0
-        vmul.f32        q10, q8,  q0
-        beq             2f
-        vld1.32         {q1},[r1,:128]!
-        vcvt.f32.s32    q3,  q1
-        vld1.32         {q2},[r1,:128]!
-        vcvt.f32.s32    q8,  q2
-        vst1.32         {q9}, [r0,:128]!
-        vst1.32         {q10},[r0,:128]!
-        b               1b
-2:      vst1.32         {q9}, [r0,:128]!
-        vst1.32         {q10},[r0,:128]!
-        bx              lr
-        .unreq  len
-endfunc
-
 function ff_vector_fmul_reverse_neon, export=1
         add             r2,  r2,  r3,  lsl #2
         sub             r2,  r2,  #32
diff --git a/libavcodec/arm/dsputil_vfp.S b/libavcodec/arm/dsputil_vfp.S
index a65b69e20a..197d500819 100644
--- a/libavcodec/arm/dsputil_vfp.S
+++ b/libavcodec/arm/dsputil_vfp.S
@@ -131,58 +131,3 @@ function ff_vector_fmul_reverse_vfp, export=1
         vpop            {d8-d15}
         bx              lr
 endfunc
-
-#if HAVE_ARMV6
-/**
- * ARM VFP optimized float to int16 conversion.
- * Assume that len is a positive number and is multiple of 8, destination
- * buffer is at least 4 bytes aligned (8 bytes alignment is better for
- * performance), little endian byte sex
- */
-@ void ff_float_to_int16_vfp(int16_t *dst, const float *src, int len)
-function ff_float_to_int16_vfp, export=1
-        push            {r4-r8,lr}
-        vpush           {d8-d11}
-        vldmia          r1!, {s16-s23}
-        vcvt.s32.f32    s0,  s16
-        vcvt.s32.f32    s1,  s17
-        vcvt.s32.f32    s2,  s18
-        vcvt.s32.f32    s3,  s19
-        vcvt.s32.f32    s4,  s20
-        vcvt.s32.f32    s5,  s21
-        vcvt.s32.f32    s6,  s22
-        vcvt.s32.f32    s7,  s23
-1:
-        subs            r2,  r2,  #8
-        vmov            r3,  r4,  s0, s1
-        vmov            r5,  r6,  s2, s3
-        vmov            r7,  r8,  s4, s5
-        vmov            ip,  lr,  s6, s7
-        vldmiagt        r1!, {s16-s23}
-        ssat            r4,  #16, r4
-        ssat            r3,  #16, r3
-        ssat            r6,  #16, r6
-        ssat            r5,  #16, r5
-        pkhbt           r3,  r3,  r4, lsl #16
-        pkhbt           r4,  r5,  r6, lsl #16
-        vcvtgt.s32.f32  s0,  s16
-        vcvtgt.s32.f32  s1,  s17
-        vcvtgt.s32.f32  s2,  s18
-        vcvtgt.s32.f32  s3,  s19
-        vcvtgt.s32.f32  s4,  s20
-        vcvtgt.s32.f32  s5,  s21
-        vcvtgt.s32.f32  s6,  s22
-        vcvtgt.s32.f32  s7,  s23
-        ssat            r8,  #16, r8
-        ssat            r7,  #16, r7
-        ssat            lr,  #16, lr
-        ssat            ip,  #16, ip
-        pkhbt           r5,  r7,  r8, lsl #16
-        pkhbt           r6,  ip,  lr, lsl #16
-        stmia           r0!, {r3-r6}
-        bgt             1b
-
-        vpop            {d8-d11}
-        pop             {r4-r8,pc}
-endfunc
-#endif
diff --git a/libavcodec/arm/fmtconvert_init_arm.c b/libavcodec/arm/fmtconvert_init_arm.c
new file mode 100644
index 0000000000..4b6e3939f5
--- /dev/null
+++ b/libavcodec/arm/fmtconvert_init_arm.c
@@ -0,0 +1,48 @@
+/*
+ * ARM optimized Format Conversion Utils
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdint.h>
+
+#include "libavcodec/avcodec.h"
+#include "libavcodec/fmtconvert.h"
+
+void ff_int32_to_float_fmul_scalar_neon(float *dst, const int *src,
+                                        float mul, int len);
+
+void ff_float_to_int16_neon(int16_t *dst, const float *src, long len);
+void ff_float_to_int16_interleave_neon(int16_t *, const float **, long, int);
+
+void ff_float_to_int16_vfp(int16_t *dst, const float *src, long len);
+
+void ff_fmt_convert_init_arm(FmtConvertContext *c, AVCodecContext *avctx)
+{
+    if (HAVE_ARMVFP && HAVE_ARMV6) {
+        c->float_to_int16 = ff_float_to_int16_vfp;
+    }
+
+    if (HAVE_NEON) {
+        c->int32_to_float_fmul_scalar = ff_int32_to_float_fmul_scalar_neon;
+
+        if (!(avctx->flags & CODEC_FLAG_BITEXACT)) {
+            c->float_to_int16            = ff_float_to_int16_neon;
+            c->float_to_int16_interleave = ff_float_to_int16_interleave_neon;
+        }
+    }
+}
diff --git a/libavcodec/arm/fmtconvert_neon.S b/libavcodec/arm/fmtconvert_neon.S
new file mode 100644
index 0000000000..359e57e40b
--- /dev/null
+++ b/libavcodec/arm/fmtconvert_neon.S
@@ -0,0 +1,391 @@
+/*
+ * ARM NEON optimised Format Conversion Utils
+ * Copyright (c) 2008 Mans Rullgard <mans@mansr.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+#include "asm.S"
+
+        preserve8
+        .text
+
+function ff_float_to_int16_neon, export=1
+        subs            r2,  r2,  #8
+        vld1.64         {d0-d1},  [r1,:128]!
+        vcvt.s32.f32    q8,  q0,  #16
+        vld1.64         {d2-d3},  [r1,:128]!
+        vcvt.s32.f32    q9,  q1,  #16
+        beq             3f
+        bics            ip,  r2,  #15
+        beq             2f
+1:      subs            ip,  ip,  #16
+        vshrn.s32       d4,  q8,  #16
+        vld1.64         {d0-d1},  [r1,:128]!
+        vcvt.s32.f32    q0,  q0,  #16
+        vshrn.s32       d5,  q9,  #16
+        vld1.64         {d2-d3},  [r1,:128]!
+        vcvt.s32.f32    q1,  q1,  #16
+        vshrn.s32       d6,  q0,  #16
+        vst1.64         {d4-d5},  [r0,:128]!
+        vshrn.s32       d7,  q1,  #16
+        vld1.64         {d16-d17},[r1,:128]!
+        vcvt.s32.f32    q8,  q8,  #16
+        vld1.64         {d18-d19},[r1,:128]!
+        vcvt.s32.f32    q9,  q9,  #16
+        vst1.64         {d6-d7},  [r0,:128]!
+        bne             1b
+        ands            r2,  r2,  #15
+        beq             3f
+2:      vld1.64         {d0-d1},  [r1,:128]!
+        vshrn.s32       d4,  q8,  #16
+        vcvt.s32.f32    q0,  q0,  #16
+        vld1.64         {d2-d3},  [r1,:128]!
+        vshrn.s32       d5,  q9,  #16
+        vcvt.s32.f32    q1,  q1,  #16
+        vshrn.s32       d6,  q0,  #16
+        vst1.64         {d4-d5},  [r0,:128]!
+        vshrn.s32       d7,  q1,  #16
+        vst1.64         {d6-d7},  [r0,:128]!
+        bx              lr
+3:      vshrn.s32       d4,  q8,  #16
+        vshrn.s32       d5,  q9,  #16
+        vst1.64         {d4-d5},  [r0,:128]!
+        bx              lr
+endfunc
+
+function ff_float_to_int16_interleave_neon, export=1
+        cmp             r3, #2
+        ldrlt           r1, [r1]
+        blt             ff_float_to_int16_neon
+        bne             4f
+
+        ldr             r3, [r1]
+        ldr             r1, [r1, #4]
+
+        subs            r2,  r2,  #8
+        vld1.64         {d0-d1},  [r3,:128]!
+        vcvt.s32.f32    q8,  q0,  #16
+        vld1.64         {d2-d3},  [r3,:128]!
+        vcvt.s32.f32    q9,  q1,  #16
+        vld1.64         {d20-d21},[r1,:128]!
+        vcvt.s32.f32    q10, q10, #16
+        vld1.64         {d22-d23},[r1,:128]!
+        vcvt.s32.f32    q11, q11, #16
+        beq             3f
+        bics            ip,  r2,  #15
+        beq             2f
+1:      subs            ip,  ip,  #16
+        vld1.64         {d0-d1},  [r3,:128]!
+        vcvt.s32.f32    q0,  q0,  #16
+        vsri.32         q10, q8,  #16
+        vld1.64         {d2-d3},  [r3,:128]!
+        vcvt.s32.f32    q1,  q1,  #16
+        vld1.64         {d24-d25},[r1,:128]!
+        vcvt.s32.f32    q12, q12, #16
+        vld1.64         {d26-d27},[r1,:128]!
+        vsri.32         q11, q9,  #16
+        vst1.64         {d20-d21},[r0,:128]!
+        vcvt.s32.f32    q13, q13, #16
+        vst1.64         {d22-d23},[r0,:128]!
+        vsri.32         q12, q0,  #16
+        vld1.64         {d16-d17},[r3,:128]!
+        vsri.32         q13, q1,  #16
+        vst1.64         {d24-d25},[r0,:128]!
+        vcvt.s32.f32    q8,  q8,  #16
+        vld1.64         {d18-d19},[r3,:128]!
+        vcvt.s32.f32    q9,  q9,  #16
+        vld1.64         {d20-d21},[r1,:128]!
+        vcvt.s32.f32    q10, q10, #16
+        vld1.64         {d22-d23},[r1,:128]!
+        vcvt.s32.f32    q11, q11, #16
+        vst1.64         {d26-d27},[r0,:128]!
+        bne             1b
+        ands            r2,  r2,  #15
+        beq             3f
+2:      vsri.32         q10, q8,  #16
+        vld1.64         {d0-d1},  [r3,:128]!
+        vcvt.s32.f32    q0,  q0,  #16
+        vld1.64         {d2-d3},  [r3,:128]!
+        vcvt.s32.f32    q1,  q1,  #16
+        vld1.64         {d24-d25},[r1,:128]!
+        vcvt.s32.f32    q12, q12, #16
+        vsri.32         q11, q9,  #16
+        vld1.64         {d26-d27},[r1,:128]!
+        vcvt.s32.f32    q13, q13, #16
+        vst1.64         {d20-d21},[r0,:128]!
+        vsri.32         q12, q0,  #16
+        vst1.64         {d22-d23},[r0,:128]!
+        vsri.32         q13, q1,  #16
+        vst1.64         {d24-d27},[r0,:128]!
+        bx              lr
+3:      vsri.32         q10, q8,  #16
+        vsri.32         q11, q9,  #16
+        vst1.64         {d20-d23},[r0,:128]!
+        bx              lr
+
+4:      push            {r4-r8,lr}
+        cmp             r3,  #4
+        lsl             ip,  r3,  #1
+        blt             4f
+
+        @ 4 channels
+5:      ldmia           r1!, {r4-r7}
+        mov             lr,  r2
+        mov             r8,  r0
+        vld1.64         {d16-d17},[r4,:128]!
+        vcvt.s32.f32    q8,  q8,  #16
+        vld1.64         {d18-d19},[r5,:128]!
+        vcvt.s32.f32    q9,  q9,  #16
+        vld1.64         {d20-d21},[r6,:128]!
+        vcvt.s32.f32    q10, q10, #16
+        vld1.64         {d22-d23},[r7,:128]!
+        vcvt.s32.f32    q11, q11, #16
+6:      subs            lr,  lr,  #8
+        vld1.64         {d0-d1},  [r4,:128]!
+        vcvt.s32.f32    q0,  q0,  #16
+        vsri.32         q9,  q8,  #16
+        vld1.64         {d2-d3},  [r5,:128]!
+        vcvt.s32.f32    q1,  q1,  #16
+        vsri.32         q11, q10, #16
+        vld1.64         {d4-d5},  [r6,:128]!
+        vcvt.s32.f32    q2,  q2,  #16
+        vzip.32         d18, d22
+        vld1.64         {d6-d7},  [r7,:128]!
+        vcvt.s32.f32    q3,  q3,  #16
+        vzip.32         d19, d23
+        vst1.64         {d18},    [r8], ip
+        vsri.32         q1,  q0,  #16
+        vst1.64         {d22},    [r8], ip
+        vsri.32         q3,  q2,  #16
+        vst1.64         {d19},    [r8], ip
+        vzip.32         d2,  d6
+        vst1.64         {d23},    [r8], ip
+        vzip.32         d3,  d7
+        beq             7f
+        vld1.64         {d16-d17},[r4,:128]!
+        vcvt.s32.f32    q8,  q8,  #16
+        vst1.64         {d2},     [r8], ip
+        vld1.64         {d18-d19},[r5,:128]!
+        vcvt.s32.f32    q9,  q9,  #16
+        vst1.64         {d6},     [r8], ip
+        vld1.64         {d20-d21},[r6,:128]!
+        vcvt.s32.f32    q10, q10, #16
+        vst1.64         {d3},     [r8], ip
+        vld1.64         {d22-d23},[r7,:128]!
+        vcvt.s32.f32    q11, q11, #16
+        vst1.64         {d7},     [r8], ip
+        b               6b
+7:      vst1.64         {d2},     [r8], ip
+        vst1.64         {d6},     [r8], ip
+        vst1.64         {d3},     [r8], ip
+        vst1.64         {d7},     [r8], ip
+        subs            r3,  r3,  #4
+        popeq           {r4-r8,pc}
+        cmp             r3,  #4
+        add             r0,  r0,  #8
+        bge             5b
+
+        @ 2 channels
+4:      cmp             r3,  #2
+        blt             4f
+        ldmia           r1!, {r4-r5}
+        mov             lr,  r2
+        mov             r8,  r0
+        tst             lr,  #8
+        vld1.64         {d16-d17},[r4,:128]!
+        vcvt.s32.f32    q8,  q8,  #16
+        vld1.64         {d18-d19},[r5,:128]!
+        vcvt.s32.f32    q9,  q9,  #16
+        vld1.64         {d20-d21},[r4,:128]!
+        vcvt.s32.f32    q10, q10, #16
+        vld1.64         {d22-d23},[r5,:128]!
+        vcvt.s32.f32    q11, q11, #16
+        beq             6f
+        subs            lr,  lr,  #8
+        beq             7f
+        vsri.32         d18, d16, #16
+        vsri.32         d19, d17, #16
+        vld1.64         {d16-d17},[r4,:128]!
+        vcvt.s32.f32    q8,  q8,  #16
+        vst1.32         {d18[0]}, [r8], ip
+        vsri.32         d22, d20, #16
+        vst1.32         {d18[1]}, [r8], ip
+        vsri.32         d23, d21, #16
+        vst1.32         {d19[0]}, [r8], ip
+        vst1.32         {d19[1]}, [r8], ip
+        vld1.64         {d18-d19},[r5,:128]!
+        vcvt.s32.f32    q9,  q9,  #16
+        vst1.32         {d22[0]}, [r8], ip
+        vst1.32         {d22[1]}, [r8], ip
+        vld1.64         {d20-d21},[r4,:128]!
+        vcvt.s32.f32    q10, q10, #16
+        vst1.32         {d23[0]}, [r8], ip
+        vst1.32         {d23[1]}, [r8], ip
+        vld1.64         {d22-d23},[r5,:128]!
+        vcvt.s32.f32    q11, q11, #16
+6:      subs            lr,  lr,  #16
+        vld1.64         {d0-d1},  [r4,:128]!
+        vcvt.s32.f32    q0,  q0,  #16
+        vsri.32         d18, d16, #16
+        vld1.64         {d2-d3},  [r5,:128]!
+        vcvt.s32.f32    q1,  q1,  #16
+        vsri.32         d19, d17, #16
+        vld1.64         {d4-d5},  [r4,:128]!
+        vcvt.s32.f32    q2,  q2,  #16
+        vld1.64         {d6-d7},  [r5,:128]!
+        vcvt.s32.f32    q3,  q3,  #16
+        vst1.32         {d18[0]}, [r8], ip
+        vsri.32         d22, d20, #16
+        vst1.32         {d18[1]}, [r8], ip
+        vsri.32         d23, d21, #16
+        vst1.32         {d19[0]}, [r8], ip
+        vsri.32         d2,  d0,  #16
+        vst1.32         {d19[1]}, [r8], ip
+        vsri.32         d3,  d1,  #16
+        vst1.32         {d22[0]}, [r8], ip
+        vsri.32         d6,  d4,  #16
+        vst1.32         {d22[1]}, [r8], ip
+        vsri.32         d7,  d5,  #16
+        vst1.32         {d23[0]}, [r8], ip
+        vst1.32         {d23[1]}, [r8], ip
+        beq             6f
+        vld1.64         {d16-d17},[r4,:128]!
+        vcvt.s32.f32    q8,  q8,  #16
+        vst1.32         {d2[0]},  [r8], ip
+        vst1.32         {d2[1]},  [r8], ip
+        vld1.64         {d18-d19},[r5,:128]!
+        vcvt.s32.f32    q9,  q9,  #16
+        vst1.32         {d3[0]},  [r8], ip
+        vst1.32         {d3[1]},  [r8], ip
+        vld1.64         {d20-d21},[r4,:128]!
+        vcvt.s32.f32    q10, q10, #16
+        vst1.32         {d6[0]},  [r8], ip
+        vst1.32         {d6[1]},  [r8], ip
+        vld1.64         {d22-d23},[r5,:128]!
+        vcvt.s32.f32    q11, q11, #16
+        vst1.32         {d7[0]},  [r8], ip
+        vst1.32         {d7[1]},  [r8], ip
+        bgt             6b
+6:      vst1.32         {d2[0]},  [r8], ip
+        vst1.32         {d2[1]},  [r8], ip
+        vst1.32         {d3[0]},  [r8], ip
+        vst1.32         {d3[1]},  [r8], ip
+        vst1.32         {d6[0]},  [r8], ip
+        vst1.32         {d6[1]},  [r8], ip
+        vst1.32         {d7[0]},  [r8], ip
+        vst1.32         {d7[1]},  [r8], ip
+        b               8f
+7:      vsri.32         d18, d16, #16
+        vsri.32         d19, d17, #16
+        vst1.32         {d18[0]}, [r8], ip
+        vsri.32         d22, d20, #16
+        vst1.32         {d18[1]}, [r8], ip
+        vsri.32         d23, d21, #16
+        vst1.32         {d19[0]}, [r8], ip
+        vst1.32         {d19[1]}, [r8], ip
+        vst1.32         {d22[0]}, [r8], ip
+        vst1.32         {d22[1]}, [r8], ip
+        vst1.32         {d23[0]}, [r8], ip
+        vst1.32         {d23[1]}, [r8], ip
+8:      subs            r3,  r3,  #2
+        add             r0,  r0,  #4
+        popeq           {r4-r8,pc}
+
+        @ 1 channel
+4:      ldr             r4,  [r1],#4
+        tst             r2,  #8
+        mov             lr,  r2
+        mov             r5,  r0
+        vld1.64         {d0-d1},  [r4,:128]!
+        vcvt.s32.f32    q0,  q0,  #16
+        vld1.64         {d2-d3},  [r4,:128]!
+        vcvt.s32.f32    q1,  q1,  #16
+        bne             8f
+6:      subs            lr,  lr,  #16
+        vld1.64         {d4-d5},  [r4,:128]!
+        vcvt.s32.f32    q2,  q2,  #16
+        vld1.64         {d6-d7},  [r4,:128]!
+        vcvt.s32.f32    q3,  q3,  #16
+        vst1.16         {d0[1]},  [r5,:16], ip
+        vst1.16         {d0[3]},  [r5,:16], ip
+        vst1.16         {d1[1]},  [r5,:16], ip
+        vst1.16         {d1[3]},  [r5,:16], ip
+        vst1.16         {d2[1]},  [r5,:16], ip
+        vst1.16         {d2[3]},  [r5,:16], ip
+        vst1.16         {d3[1]},  [r5,:16], ip
+        vst1.16         {d3[3]},  [r5,:16], ip
+        beq             7f
+        vld1.64         {d0-d1},  [r4,:128]!
+        vcvt.s32.f32    q0,  q0,  #16
+        vld1.64         {d2-d3},  [r4,:128]!
+        vcvt.s32.f32    q1,  q1,  #16
+7:      vst1.16         {d4[1]},  [r5,:16], ip
+        vst1.16         {d4[3]},  [r5,:16], ip
+        vst1.16         {d5[1]},  [r5,:16], ip
+        vst1.16         {d5[3]},  [r5,:16], ip
+        vst1.16         {d6[1]},  [r5,:16], ip
+        vst1.16         {d6[3]},  [r5,:16], ip
+        vst1.16         {d7[1]},  [r5,:16], ip
+        vst1.16         {d7[3]},  [r5,:16], ip
+        bgt             6b
+        pop             {r4-r8,pc}
+8:      subs            lr,  lr,  #8
+        vst1.16         {d0[1]},  [r5,:16], ip
+        vst1.16         {d0[3]},  [r5,:16], ip
+        vst1.16         {d1[1]},  [r5,:16], ip
+        vst1.16         {d1[3]},  [r5,:16], ip
+        vst1.16         {d2[1]},  [r5,:16], ip
+        vst1.16         {d2[3]},  [r5,:16], ip
+        vst1.16         {d3[1]},  [r5,:16], ip
+        vst1.16         {d3[3]},  [r5,:16], ip
+        popeq           {r4-r8,pc}
+        vld1.64         {d0-d1},  [r4,:128]!
+        vcvt.s32.f32    q0,  q0,  #16
+        vld1.64         {d2-d3},  [r4,:128]!
+        vcvt.s32.f32    q1,  q1,  #16
+        b               6b
+endfunc
+
+function ff_int32_to_float_fmul_scalar_neon, export=1
+VFP     vdup.32         q0,  d0[0]
+VFP     len     .req    r2
+NOVFP   vdup.32         q0,  r2
+NOVFP   len     .req    r3
+
+        vld1.32         {q1},[r1,:128]!
+        vcvt.f32.s32    q3,  q1
+        vld1.32         {q2},[r1,:128]!
+        vcvt.f32.s32    q8,  q2
+1:      subs            len, len, #8
+        pld             [r1, #16]
+        vmul.f32        q9,  q3,  q0
+        vmul.f32        q10, q8,  q0
+        beq             2f
+        vld1.32         {q1},[r1,:128]!
+        vcvt.f32.s32    q3,  q1
+        vld1.32         {q2},[r1,:128]!
+        vcvt.f32.s32    q8,  q2
+        vst1.32         {q9}, [r0,:128]!
+        vst1.32         {q10},[r0,:128]!
+        b               1b
+2:      vst1.32         {q9}, [r0,:128]!
+        vst1.32         {q10},[r0,:128]!
+        bx              lr
+        .unreq  len
+endfunc
diff --git a/libavcodec/arm/fmtconvert_vfp.S b/libavcodec/arm/fmtconvert_vfp.S
new file mode 100644
index 0000000000..1d19e7758b
--- /dev/null
+++ b/libavcodec/arm/fmtconvert_vfp.S
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2008 Siarhei Siamashka <ssvb@users.sourceforge.net>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+#include "asm.S"
+
+        .syntax unified
+
+/**
+ * ARM VFP optimized float to int16 conversion.
+ * Assume that len is a positive number and is multiple of 8, destination
+ * buffer is at least 4 bytes aligned (8 bytes alignment is better for
+ * performance), little endian byte sex
+ */
+@ void ff_float_to_int16_vfp(int16_t *dst, const float *src, int len)
+function ff_float_to_int16_vfp, export=1
+        push            {r4-r8,lr}
+        vpush           {d8-d11}
+        vldmia          r1!, {s16-s23}
+        vcvt.s32.f32    s0,  s16
+        vcvt.s32.f32    s1,  s17
+        vcvt.s32.f32    s2,  s18
+        vcvt.s32.f32    s3,  s19
+        vcvt.s32.f32    s4,  s20
+        vcvt.s32.f32    s5,  s21
+        vcvt.s32.f32    s6,  s22
+        vcvt.s32.f32    s7,  s23
+1:
+        subs            r2,  r2,  #8
+        vmov            r3,  r4,  s0, s1
+        vmov            r5,  r6,  s2, s3
+        vmov            r7,  r8,  s4, s5
+        vmov            ip,  lr,  s6, s7
+        vldmiagt        r1!, {s16-s23}
+        ssat            r4,  #16, r4
+        ssat            r3,  #16, r3
+        ssat            r6,  #16, r6
+        ssat            r5,  #16, r5
+        pkhbt           r3,  r3,  r4, lsl #16
+        pkhbt           r4,  r5,  r6, lsl #16
+        vcvtgt.s32.f32  s0,  s16
+        vcvtgt.s32.f32  s1,  s17
+        vcvtgt.s32.f32  s2,  s18
+        vcvtgt.s32.f32  s3,  s19
+        vcvtgt.s32.f32  s4,  s20
+        vcvtgt.s32.f32  s5,  s21
+        vcvtgt.s32.f32  s6,  s22
+        vcvtgt.s32.f32  s7,  s23
+        ssat            r8,  #16, r8
+        ssat            r7,  #16, r7
+        ssat            lr,  #16, lr
+        ssat            ip,  #16, ip
+        pkhbt           r5,  r7,  r8, lsl #16
+        pkhbt           r6,  ip,  lr, lsl #16
+        stmia           r0!, {r3-r6}
+        bgt             1b
+
+        vpop            {d8-d11}
+        pop             {r4-r8,pc}
+endfunc