Rename libavcodec/i386/ --> libavcodec/x86/.

It contains optimizations that are not specific to i386 and
libavutil uses this naming scheme already.

Originally committed as revision 16270 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 202 insertions, 0 deletions

diff --git a/libavcodec/x86/fft_sse.c b/libavcodec/x86/fft_sse.c
new file mode 100644
index 0000000000..deced3b929
--- /dev/null
+++ b/libavcodec/x86/fft_sse.c
@@ -0,0 +1,202 @@
+/*
+ * FFT/MDCT transform with SSE optimizations
+ * Copyright (c) 2008 Loren Merritt
+ *
+ * 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 "libavutil/x86_cpu.h"
+#include "libavcodec/dsputil.h"
+
+static const int m1m1m1m1[4] __attribute__((aligned(16))) =
+    { 1 << 31, 1 << 31, 1 << 31, 1 << 31 };
+
+void ff_fft_dispatch_sse(FFTComplex *z, int nbits);
+void ff_fft_dispatch_interleave_sse(FFTComplex *z, int nbits);
+
+void ff_fft_calc_sse(FFTContext *s, FFTComplex *z)
+{
+    int n = 1 << s->nbits;
+
+    ff_fft_dispatch_interleave_sse(z, s->nbits);
+
+    if(n <= 16) {
+        x86_reg i = -8*n;
+        __asm__ volatile(
+            "1: \n"
+            "movaps     (%0,%1), %%xmm0 \n"
+            "movaps      %%xmm0, %%xmm1 \n"
+            "unpcklps 16(%0,%1), %%xmm0 \n"
+            "unpckhps 16(%0,%1), %%xmm1 \n"
+            "movaps      %%xmm0,   (%0,%1) \n"
+            "movaps      %%xmm1, 16(%0,%1) \n"
+            "add $32, %0 \n"
+            "jl 1b \n"
+            :"+r"(i)
+            :"r"(z+n)
+            :"memory"
+        );
+    }
+}
+
+void ff_fft_permute_sse(FFTContext *s, FFTComplex *z)
+{
+    int n = 1 << s->nbits;
+    int i;
+    for(i=0; i<n; i+=2) {
+        __asm__ volatile(
+            "movaps %2, %%xmm0 \n"
+            "movlps %%xmm0, %0 \n"
+            "movhps %%xmm0, %1 \n"
+            :"=m"(s->tmp_buf[s->revtab[i]]),
+             "=m"(s->tmp_buf[s->revtab[i+1]])
+            :"m"(z[i])
+        );
+    }
+    memcpy(z, s->tmp_buf, n*sizeof(FFTComplex));
+}
+
+void ff_imdct_half_sse(MDCTContext *s, FFTSample *output, const FFTSample *input)
+{
+    av_unused x86_reg i, j, k, l;
+    long n = 1 << s->nbits;
+    long n2 = n >> 1;
+    long n4 = n >> 2;
+    long n8 = n >> 3;
+    const uint16_t *revtab = s->fft.revtab + n8;
+    const FFTSample *tcos = s->tcos;
+    const FFTSample *tsin = s->tsin;
+    FFTComplex *z = (FFTComplex *)output;
+
+    /* pre rotation */
+    for(k=n8-2; k>=0; k-=2) {
+        __asm__ volatile(
+            "movaps     (%2,%1,2), %%xmm0 \n" // { z[k].re,    z[k].im,    z[k+1].re,  z[k+1].im  }
+            "movaps  -16(%2,%0,2), %%xmm1 \n" // { z[-k-2].re, z[-k-2].im, z[-k-1].re, z[-k-1].im }
+            "movaps        %%xmm0, %%xmm2 \n"
+            "shufps $0x88, %%xmm1, %%xmm0 \n" // { z[k].re,    z[k+1].re,  z[-k-2].re, z[-k-1].re }
+            "shufps $0x77, %%xmm2, %%xmm1 \n" // { z[-k-1].im, z[-k-2].im, z[k+1].im,  z[k].im    }
+            "movlps       (%3,%1), %%xmm4 \n"
+            "movlps       (%4,%1), %%xmm5 \n"
+            "movhps     -8(%3,%0), %%xmm4 \n" // { cos[k],     cos[k+1],   cos[-k-2],  cos[-k-1]  }
+            "movhps     -8(%4,%0), %%xmm5 \n" // { sin[k],     sin[k+1],   sin[-k-2],  sin[-k-1]  }
+            "movaps        %%xmm0, %%xmm2 \n"
+            "movaps        %%xmm1, %%xmm3 \n"
+            "mulps         %%xmm5, %%xmm0 \n" // re*sin
+            "mulps         %%xmm4, %%xmm1 \n" // im*cos
+            "mulps         %%xmm4, %%xmm2 \n" // re*cos
+            "mulps         %%xmm5, %%xmm3 \n" // im*sin
+            "subps         %%xmm0, %%xmm1 \n" // -> re
+            "addps         %%xmm3, %%xmm2 \n" // -> im
+            "movaps        %%xmm1, %%xmm0 \n"
+            "unpcklps      %%xmm2, %%xmm1 \n" // { z[k],    z[k+1]  }
+            "unpckhps      %%xmm2, %%xmm0 \n" // { z[-k-2], z[-k-1] }
+            ::"r"(-4*k), "r"(4*k),
+              "r"(input+n4), "r"(tcos+n8), "r"(tsin+n8)
+        );
+#ifdef ARCH_X86_64
+        // if we have enough regs, don't let gcc make the luts latency-bound
+        // but if not, latency is faster than spilling
+        __asm__("movlps %%xmm0, %0 \n"
+            "movhps %%xmm0, %1 \n"
+            "movlps %%xmm1, %2 \n"
+            "movhps %%xmm1, %3 \n"
+            :"=m"(z[revtab[-k-2]]),
+             "=m"(z[revtab[-k-1]]),
+             "=m"(z[revtab[ k  ]]),
+             "=m"(z[revtab[ k+1]])
+        );
+#else
+        __asm__("movlps %%xmm0, %0" :"=m"(z[revtab[-k-2]]));
+        __asm__("movhps %%xmm0, %0" :"=m"(z[revtab[-k-1]]));
+        __asm__("movlps %%xmm1, %0" :"=m"(z[revtab[ k  ]]));
+        __asm__("movhps %%xmm1, %0" :"=m"(z[revtab[ k+1]]));
+#endif
+    }
+
+    ff_fft_dispatch_sse(z, s->fft.nbits);
+
+    /* post rotation + reinterleave + reorder */
+
+#define CMUL(j,xmm0,xmm1)\
+        "movaps   (%2,"#j",2), %%xmm6 \n"\
+        "movaps 16(%2,"#j",2), "#xmm0"\n"\
+        "movaps        %%xmm6, "#xmm1"\n"\
+        "movaps        "#xmm0",%%xmm7 \n"\
+        "mulps      (%3,"#j"), %%xmm6 \n"\
+        "mulps      (%4,"#j"), "#xmm0"\n"\
+        "mulps      (%4,"#j"), "#xmm1"\n"\
+        "mulps      (%3,"#j"), %%xmm7 \n"\
+        "subps         %%xmm6, "#xmm0"\n"\
+        "addps         %%xmm7, "#xmm1"\n"
+
+    j = -n2;
+    k = n2-16;
+    __asm__ volatile(
+        "1: \n"
+        CMUL(%0, %%xmm0, %%xmm1)
+        CMUL(%1, %%xmm4, %%xmm5)
+        "shufps    $0x1b, %%xmm1, %%xmm1 \n"
+        "shufps    $0x1b, %%xmm5, %%xmm5 \n"
+        "movaps   %%xmm4, %%xmm6 \n"
+        "unpckhps %%xmm1, %%xmm4 \n"
+        "unpcklps %%xmm1, %%xmm6 \n"
+        "movaps   %%xmm0, %%xmm2 \n"
+        "unpcklps %%xmm5, %%xmm0 \n"
+        "unpckhps %%xmm5, %%xmm2 \n"
+        "movaps   %%xmm6,   (%2,%1,2) \n"
+        "movaps   %%xmm4, 16(%2,%1,2) \n"
+        "movaps   %%xmm0,   (%2,%0,2) \n"
+        "movaps   %%xmm2, 16(%2,%0,2) \n"
+        "sub $16, %1 \n"
+        "add $16, %0 \n"
+        "jl 1b \n"
+        :"+&r"(j), "+&r"(k)
+        :"r"(z+n8), "r"(tcos+n8), "r"(tsin+n8)
+        :"memory"
+    );
+}
+
+void ff_imdct_calc_sse(MDCTContext *s, FFTSample *output, const FFTSample *input)
+{
+    x86_reg j, k;
+    long n = 1 << s->nbits;
+    long n4 = n >> 2;
+
+    ff_imdct_half_sse(s, output+n4, input);
+
+    j = -n;
+    k = n-16;
+    __asm__ volatile(
+        "movaps %4, %%xmm7 \n"
+        "1: \n"
+        "movaps       (%2,%1), %%xmm0 \n"
+        "movaps       (%3,%0), %%xmm1 \n"
+        "shufps $0x1b, %%xmm0, %%xmm0 \n"
+        "shufps $0x1b, %%xmm1, %%xmm1 \n"
+        "xorps         %%xmm7, %%xmm0 \n"
+        "movaps        %%xmm1, (%3,%1) \n"
+        "movaps        %%xmm0, (%2,%0) \n"
+        "sub $16, %1 \n"
+        "add $16, %0 \n"
+        "jl 1b \n"
+        :"+r"(j), "+r"(k)
+        :"r"(output+n4), "r"(output+n4*3),
+         "m"(*m1m1m1m1)
+    );
+}
+