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Fix misaligned load/store. Also, these are little endian so merge the low order bytes first. Since this code _is_ portable, I can test it on x86 linux.

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This commit is contained in:
Steve Checkoway
2006-06-19 02:53:14 +00:00
parent e3627c7377
commit 7dbdc89b8c
1 changed files with 3 additions and 3 deletions
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stepmania/src/archutils/Darwin/VectorHelper.cpp
+3 -3
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@@ -406,7 +406,7 @@ void Vector::FastSoundWrite( int32_t *dest, const int16_t *src, unsigned size, s
if( size == 0 )
return;
ASSERT_M( (intptr_t(dest) & 0x7) == 0, ssprintf("dest = %p", dest) );
if( intptr_t(dest) & 0xF )
while( (intptr_t(dest) & 0xF) && size )
{
// Misaligned stores are slow.
*(dest++) += *(src++) * volume;
@@ -422,8 +422,8 @@ void Vector::FastSoundWrite( int32_t *dest, const int16_t *src, unsigned size, s
__m128i data = _mm_loadu_si128( (__m128i *)src );
__m128i hi = _mm_mulhi_epi16( data, vol );
__m128i low = _mm_mullo_epi16( data, vol );
__m128i result1 = _mm_unpacklo_epi16( hi, low );
__m128i result2 = _mm_unpackhi_epi16( hi, low );
__m128i result1 = _mm_unpacklo_epi16( low, hi );
__m128i result2 = _mm_unpackhi_epi16( low, hi );
result1 = _mm_add_epi32( result1, *(__m128i *)(dest + 0) );
result2 = _mm_add_epi32( result2, *(__m128i *)(dest + 4) );