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Allow endian-aware optimizations only on whitelisted CPUs.

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This commit is contained in:
Garret Rieger
2017-07-19 17:34:24 -07:00
parent 12141fdaf2
commit 4f659ddbad
3 changed files with 21 additions and 6 deletions
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src/store_bytes.h
+6 -4
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@@ -22,6 +22,8 @@
#include <stddef.h>
#include <string.h>
#include "./port.h"
namespace woff2 {
inline size_t StoreU32(uint8_t* dst, size_t offset, uint32_t x) {
@@ -33,10 +35,10 @@ inline size_t StoreU32(uint8_t* dst, size_t offset, uint32_t x) {
}
inline size_t Store16(uint8_t* dst, size_t offset, int x) {
#if (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__))
#if defined(WOFF_LITTLE_ENDIAN)
*reinterpret_cast<uint16_t*>(dst + offset) =
((x & 0xFF) << 8) | ((x & 0xFF00) >> 8);
#elif (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))
#elif defined(WOFF_BIG_ENDIAN)
*reinterpret_cast<uint16_t*>(dst + offset) = static_cast<uint16_t>(x);
#else
dst[offset] = x >> 8;
@@ -53,11 +55,11 @@ inline void StoreU32(uint32_t val, size_t* offset, uint8_t* dst) {
}
inline void Store16(int val, size_t* offset, uint8_t* dst) {
#if (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__))
#if defined(WOFF_LITTLE_ENDIAN)
*reinterpret_cast<uint16_t*>(dst + *offset) =
((val & 0xFF) << 8) | ((val & 0xFF00) >> 8);
*offset += 2;
#elif (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))
#elif defined(WOFF_BIG_ENDIAN)
*reinterpret_cast<uint16_t*>(dst + *offset) = static_cast<uint16_t>(val);
*offset += 2;
#else