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Add WEBP_RESTRICT & use it in VP8BitReader

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Marking the `VP8BitReader` as `__restrict__` helps the compiler generate
better code avoiding issues related to aliasing (re-loads/stores).

Change-Id: Ib7178f57e27e5f40572efc3e567cdf994ea6d928
This commit is contained in:
Clement Courbet 2021-06-18 13:21:37 +00:00 committed by James Zern
parent f6d2924757
commit 3e26513656
2 changed files with 11 additions and 1 deletions
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2
src/utils/bit_reader_inl_utils.h
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@ -104,7 +104,7 @@ void VP8LoadNewBytes(VP8BitReader* const br) {
} }
// Read a bit with proba 'prob'. Speed-critical function! // Read a bit with proba 'prob'. Speed-critical function!
static WEBP_INLINE int VP8GetBit(VP8BitReader* const br, static WEBP_INLINE int VP8GetBit(VP8BitReader* WEBP_RESTRICT const br,
int prob, const char label[]) { int prob, const char label[]) {
// Don't move this declaration! It makes a big speed difference to store // Don't move this declaration! It makes a big speed difference to store
// 'range' *before* calling VP8LoadNewBytes(), even if this function doesn't // 'range' *before* calling VP8LoadNewBytes(), even if this function doesn't

10
src/utils/utils.h
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@ -25,6 +25,16 @@
#include "src/dsp/dsp.h" #include "src/dsp/dsp.h"
#include "src/webp/types.h" #include "src/webp/types.h"
//------------------------------------------------------------------------------
// restrict
#if defined(__GNUC__) || defined(__clang__)
#define WEBP_RESTRICT __restrict
#else
#define WEBP_RESTRICT
#endif
#ifdef __cplusplus #ifdef __cplusplus
extern "C" { extern "C" {
#endif #endif