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| author | Ben Avison <bavison@riscosopen.org> | 2013-07-15 18:28:10 +0100 |
|---|---|---|
| committer | Martin Storsjö <martin@martin.st> | 2013-07-22 10:15:30 +0300 |
| commit | ce9ed10ac27b9cf32a6257e083ea2f052692d971 (patch) | |
| tree | 8162b562d4dd904d26cde28cd62ea3fa22d07537 | |
| parent | 41ef1d360bac65032aa32f6b43ae137666507ae5 (diff) | |
| download | ffmpeg-ce9ed10ac27b9cf32a6257e083ea2f052692d971.tar.gz | |
arm: Add VFP-accelerated version of int32_to_float_fmul_scalar
Before After
Mean StdDev Mean StdDev Change
This function 1175.0 4.4 366.2 18.3 +220.8%
Overall 19285.5 292.0 18420.5 489.1 +4.7%
Signed-off-by: Martin Storsjö <martin@martin.st>
| -rw-r--r-- | libavcodec/arm/fmtconvert_init_arm.c | 10 | ||||
| -rw-r--r-- | libavcodec/arm/fmtconvert_vfp.S | 38 |
2 files changed, 48 insertions, 0 deletions
diff --git a/libavcodec/arm/fmtconvert_init_arm.c b/libavcodec/arm/fmtconvert_init_arm.c index 4f36729b00..9aab7bbac7 100644 --- a/libavcodec/arm/fmtconvert_init_arm.c +++ b/libavcodec/arm/fmtconvert_init_arm.c @@ -28,6 +28,9 @@ void ff_int32_to_float_fmul_scalar_neon(float *dst, const int32_t *src, float mul, int len); +void ff_int32_to_float_fmul_scalar_vfp(float *dst, const int32_t *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); @@ -38,6 +41,13 @@ av_cold void ff_fmt_convert_init_arm(FmtConvertContext *c, AVCodecContext *avctx int cpu_flags = av_get_cpu_flags(); if (have_vfp(cpu_flags) && have_armv6(cpu_flags)) { + if (!have_vfpv3(cpu_flags)) { + // This function doesn't use anything armv6 specific in itself, + // but ff_float_to_int16_vfp which is in the same assembly source + // file does, thus the whole file requires armv6 to be built. + c->int32_to_float_fmul_scalar = ff_int32_to_float_fmul_scalar_vfp; + } + c->float_to_int16 = ff_float_to_int16_vfp; } diff --git a/libavcodec/arm/fmtconvert_vfp.S b/libavcodec/arm/fmtconvert_vfp.S index fb12de1368..349c198c96 100644 --- a/libavcodec/arm/fmtconvert_vfp.S +++ b/libavcodec/arm/fmtconvert_vfp.S @@ -1,5 +1,6 @@ /* * Copyright (c) 2008 Siarhei Siamashka <ssvb@users.sourceforge.net> + * Copyright (c) 2013 RISC OS Open Ltd <bavison@riscosopen.org> * * This file is part of Libav. * @@ -76,3 +77,40 @@ function ff_float_to_int16_vfp, export=1 vpop {d8-d11} pop {r4-r8,pc} endfunc + +/** + * ARM VFP optimised int32 to float conversion. + * Assume len is a multiple of 8, destination buffer is at least 4 bytes aligned + * (16 bytes alignment is best for BCM2835), little-endian. + */ +@ void ff_int32_to_float_fmul_scalar_vfp(float *dst, const int32_t *src, float mul, int len) +function ff_int32_to_float_fmul_scalar_vfp, export=1 +VFP tmp .req a4 +VFP len .req a3 +NOVFP tmp .req a3 +NOVFP len .req a4 +NOVFP vmov s0, a3 + ldr tmp, =0x03070000 @ RunFast mode, short vectors of length 8, stride 1 + fmrx ip, FPSCR + fmxr FPSCR, tmp +1: + vldmia a2!, {s8-s15} + vcvt.f32.s32 s8, s8 + vcvt.f32.s32 s9, s9 + vcvt.f32.s32 s10, s10 + vcvt.f32.s32 s11, s11 + vcvt.f32.s32 s12, s12 + vcvt.f32.s32 s13, s13 + vcvt.f32.s32 s14, s14 + vcvt.f32.s32 s15, s15 + vmul.f32 s8, s8, s0 + subs len, len, #8 + vstmia a1!, {s8-s11} + vstmia a1!, {s12-s15} + bne 1b + + fmxr FPSCR, ip + bx lr +endfunc + .unreq tmp + .unreq len |