Commit 3c56688a authored by Erik de Castro Lopo's avatar Erik de Castro Lopo
Browse files

libFLAC/stream_encoder_intrin_*.c: Refactor abs calculation

Patch-from: lvqcl <lvqcl.mail@gmail.com>
parent 6ec64d3c
......@@ -43,6 +43,17 @@
#include <stdlib.h> /* for abs() */
#include <emmintrin.h> /* SSE2 */
#include "FLAC/assert.h"
#include "share/compat.h"
FLAC__SSE_TARGET("sse2")
static inline __m128i local_abs_epi32(__m128i val)
{
__m128i mask = _mm_srai_epi32(val, 31);
val = _mm_xor_si128(val, mask);
val = _mm_sub_epi32(val, mask);
return val;
}
FLAC__SSE_TARGET("sse2")
void FLAC__precompute_partition_info_sums_intrin_sse2(const FLAC__int32 residual[], FLAC__uint64 abs_residual_partition_sums[],
......@@ -71,25 +82,19 @@ void FLAC__precompute_partition_info_sums_intrin_sse2(const FLAC__int32 residual
/* assumption: residual[] is properly aligned so (residual + e1) is properly aligned too and _mm_loadu_si128() is fast */
for( ; residual_sample < e1; residual_sample++) {
__m128i mm_res = _mm_cvtsi32_si128(residual[residual_sample]);
__m128i mm_mask = _mm_srai_epi32(mm_res, 31);
mm_res = _mm_xor_si128(mm_res, mm_mask);
mm_res = _mm_sub_epi32(mm_res, mm_mask); /* abs(INT_MIN) is undefined, but if the residual is INT_MIN we have bigger problems */
mm_res = local_abs_epi32(mm_res);
mm_sum = _mm_add_epi32(mm_sum, mm_res);
}
for( ; residual_sample < e3; residual_sample+=4) {
__m128i mm_res = _mm_loadu_si128((const __m128i*)(residual+residual_sample));
__m128i mm_mask = _mm_srai_epi32(mm_res, 31);
mm_res = _mm_xor_si128(mm_res, mm_mask);
mm_res = _mm_sub_epi32(mm_res, mm_mask);
mm_res = local_abs_epi32(mm_res);
mm_sum = _mm_add_epi32(mm_sum, mm_res);
}
for( ; residual_sample < end; residual_sample++) {
__m128i mm_res = _mm_cvtsi32_si128(residual[residual_sample]);
__m128i mm_mask = _mm_srai_epi32(mm_res, 31);
mm_res = _mm_xor_si128(mm_res, mm_mask);
mm_res = _mm_sub_epi32(mm_res, mm_mask);
mm_res = local_abs_epi32(mm_res);
mm_sum = _mm_add_epi32(mm_sum, mm_res);
}
......@@ -109,26 +114,20 @@ void FLAC__precompute_partition_info_sums_intrin_sse2(const FLAC__int32 residual
for( ; residual_sample < e1; residual_sample++) {
__m128i mm_res = _mm_cvtsi32_si128(residual[residual_sample]); /* 0 0 0 r0 */
__m128i mm_mask = _mm_srai_epi32(mm_res, 31);
mm_res = _mm_xor_si128(mm_res, mm_mask);
mm_res = _mm_sub_epi32(mm_res, mm_mask); /* 0 0 0 |r0| == 00 |r0_64| */
mm_res = local_abs_epi32(mm_res); /* 0 0 0 |r0| == 00 |r0_64| */
mm_sum = _mm_add_epi64(mm_sum, mm_res);
}
for( ; residual_sample < e3; residual_sample+=2) {
__m128i mm_res = _mm_loadl_epi64((const __m128i*)(residual+residual_sample)); /* 0 0 r1 r0 */
__m128i mm_mask = _mm_srai_epi32(mm_res, 31);
mm_res = _mm_xor_si128(mm_res, mm_mask);
mm_res = _mm_sub_epi32(mm_res, mm_mask); /* 0 0 |r1| |r0| */
mm_res = local_abs_epi32(mm_res); /* 0 0 |r1| |r0| */
mm_res = _mm_shuffle_epi32(mm_res, _MM_SHUFFLE(3,1,2,0)); /* 0 |r1| 0 |r0| == |r1_64| |r0_64| */
mm_sum = _mm_add_epi64(mm_sum, mm_res);
}
for( ; residual_sample < end; residual_sample++) {
__m128i mm_res = _mm_cvtsi32_si128(residual[residual_sample]);
__m128i mm_mask = _mm_srai_epi32(mm_res, 31);
mm_res = _mm_xor_si128(mm_res, mm_mask);
mm_res = _mm_sub_epi32(mm_res, mm_mask);
mm_res = local_abs_epi32(mm_res);
mm_sum = _mm_add_epi64(mm_sum, mm_res);
}
......
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