diff options
| author | Max Kellermann <max@duempel.org> | 2013-12-28 17:23:48 +0100 |
|---|---|---|
| committer | Max Kellermann <max@duempel.org> | 2013-12-28 17:24:54 +0100 |
| commit | f3bbe4bb1ffc94d7c06769a31c6e61e54949ed9e (patch) | |
| tree | c9c3646b97adf5723f37041ead02d7a27b3e6669 /src/pcm/Volume.cxx | |
| parent | 2a3a18a2832669eea2b56dcb44e42c0d3a7822b7 (diff) | |
pcm/Volume: remove optimized i386 assembly
This code is unable to dither. Until we implement that, let's remove
the code for now. i386 isn't relevant anymore anyway.
Diffstat (limited to 'src/pcm/Volume.cxx')
| -rw-r--r-- | src/pcm/Volume.cxx | 50 |
1 files changed, 0 insertions, 50 deletions
diff --git a/src/pcm/Volume.cxx b/src/pcm/Volume.cxx index 539ef1238..0ccfe03b5 100644 --- a/src/pcm/Volume.cxx +++ b/src/pcm/Volume.cxx @@ -42,56 +42,6 @@ pcm_volume_sample(typename Traits::value_type _sample, return PcmClamp<F, Traits>(sample); } -#ifdef __i386__ - -/** - * Optimized volume function for i386. Use the EDX:EAX 2*32 bit - * multiplication result instead of emulating 64 bit multiplication. - */ -static inline int32_t -pcm_volume_sample_24(int32_t sample, int32_t volume, gcc_unused int32_t dither) -{ - int32_t result; - - asm(/* edx:eax = sample * volume */ - "imul %2\n" - - /* "add %3, %1\n" dithering disabled for now, because we - have no overflow check - is dithering really important - here? */ - - /* eax = edx:eax / PCM_VOLUME_1 */ - "sal $22, %%edx\n" - "shr $10, %1\n" - "or %%edx, %1\n" - - : "=a"(result) - : "0"(sample), "r"(volume) /* , "r"(dither) */ - : "edx" - ); - - return result; -} - -template<> -inline int32_t -pcm_volume_sample<SampleFormat::S24_P32, - SampleTraits<SampleFormat::S24_P32>>(int32_t sample, - int volume) -{ - return pcm_volume_sample_24(sample, volume, pcm_volume_dither()); -} - -template<> -inline int32_t -pcm_volume_sample<SampleFormat::S32, - SampleTraits<SampleFormat::S32>>(int32_t sample, int volume) -{ - return pcm_volume_sample_24(sample, volume, pcm_volume_dither()); -} - -#endif - template<SampleFormat F, class Traits=SampleTraits<F>> static void pcm_volume_change(typename Traits::pointer_type dest, |