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alpha_processing*: use WEBP_RESTRICT qualifier

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this helps both auto-vectorization in the C code and the optimized code
generation

Change-Id: Ide570d6be45125ffef7248bdc40e9eb08f00e832
This commit is contained in:
James Zern
2021-07-03 17:43:11 -07:00
parent a2e18f10eb
commit a1e5dae0f0
4 changed files with 54 additions and 37 deletions
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22
src/dsp/alpha_processing_sse2.c
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@ -16,11 +16,13 @@
#if defined(WEBP_USE_SSE2)
#include <emmintrin.h>
#include "src/utils/utils.h"
//------------------------------------------------------------------------------
static int DispatchAlpha_SSE2(const uint8_t* alpha, int alpha_stride,
int width, int height,
uint8_t* dst, int dst_stride) {
static int DispatchAlpha_SSE2(const uint8_t* WEBP_RESTRICT alpha,
int alpha_stride, int width, int height,
uint8_t* WEBP_RESTRICT dst, int dst_stride) {
// alpha_and stores an 'and' operation of all the alpha[] values. The final
// value is not 0xff if any of the alpha[] is not equal to 0xff.
uint32_t alpha_and = 0xff;
@ -72,9 +74,10 @@ static int DispatchAlpha_SSE2(const uint8_t* alpha, int alpha_stride,
return (alpha_and != 0xff);
}
static void DispatchAlphaToGreen_SSE2(const uint8_t* alpha, int alpha_stride,
int width, int height,
uint32_t* dst, int dst_stride) {
static void DispatchAlphaToGreen_SSE2(const uint8_t* WEBP_RESTRICT alpha,
int alpha_stride, int width, int height,
uint32_t* WEBP_RESTRICT dst,
int dst_stride) {
int i, j;
const __m128i zero = _mm_setzero_si128();
const int limit = width & ~15;
@ -98,9 +101,9 @@ static void DispatchAlphaToGreen_SSE2(const uint8_t* alpha, int alpha_stride,
}
}
static int ExtractAlpha_SSE2(const uint8_t* argb, int argb_stride,
static int ExtractAlpha_SSE2(const uint8_t* WEBP_RESTRICT argb, int argb_stride,
int width, int height,
uint8_t* alpha, int alpha_stride) {
uint8_t* WEBP_RESTRICT alpha, int alpha_stride) {
// alpha_and stores an 'and' operation of all the alpha[] values. The final
// value is not 0xff if any of the alpha[] is not equal to 0xff.
uint32_t alpha_and = 0xff;
@ -317,7 +320,8 @@ static void MultARGBRow_SSE2(uint32_t* const ptr, int width, int inverse) {
if (width > 0) WebPMultARGBRow_C(ptr + x, width, inverse);
}
static void MultRow_SSE2(uint8_t* const ptr, const uint8_t* const alpha,
static void MultRow_SSE2(uint8_t* WEBP_RESTRICT const ptr,
const uint8_t* WEBP_RESTRICT const alpha,
int width, int inverse) {
int x = 0;
if (!inverse) {