diff options
Diffstat (limited to 'celt/x86')
-rw-r--r-- | celt/x86/x86cpu.h | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/celt/x86/x86cpu.h b/celt/x86/x86cpu.h index 2394b05e..44b3a597 100644 --- a/celt/x86/x86cpu.h +++ b/celt/x86/x86cpu.h @@ -44,18 +44,26 @@ int opus_select_arch(void); # endif -/*gcc appears to emit MOVDQA's to load the argument of an _mm_cvtepi16_epi32() - when optimizations are disabled, even though the actual PMOVSXWD instruction - takes an m64. Unlike a normal m64 reference, these require 16-byte alignment - and load 16 bytes instead of 8, possibly reading out of bounds. - - We can insert an explicit MOVQ using _mm_loadl_epi64(), which should have the - same semantics as an m64 reference in the PMOVSXWD instruction itself, but - gcc is not smart enough to optimize this out when optimizations ARE enabled.*/ +/*gcc appears to emit MOVDQA's to load the argument of an _mm_cvtepi8_epi32() + or _mm_cvtepi16_epi32() when optimizations are disabled, even though the + actual PMOVSXWD instruction takes an m32 or m64. Unlike a normal memory + reference, these require 16-byte alignment and load a full 16 bytes (instead + of 4 or 8), possibly reading out of bounds. + + We can insert an explicit MOVD or MOVQ using _mm_cvtsi32_si128() or + _mm_loadl_epi64(), which should have the same semantics as an m32 or m64 + reference in the PMOVSXWD instruction itself, but gcc is not smart enough to + optimize this out when optimizations ARE enabled.*/ # if !defined(__OPTIMIZE__) +# define OP_CVTEPI8_EPI32_M32(x) \ + (_mm_cvtepi8_epi32(_mm_cvtsi32_si128(*(int *)(x)))) + # define OP_CVTEPI16_EPI32_M64(x) \ (_mm_cvtepi16_epi32(_mm_loadl_epi64((__m128i *)(x)))) # else +# define OP_CVTEPI8_EPI32_M32(x) \ + (_mm_cvtepi8_epi32(*(__m128i *)(x))) + # define OP_CVTEPI16_EPI32_M64(x) \ (_mm_cvtepi16_epi32(*(__m128i *)(x))) # endif |