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Revert "platform: fix unaligned 64-bit accesses on AArch32 (#699)" (#701)

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This reverts commit 6d027d1648.
This commit is contained in:
Eugene Kliuchnikov 2018-07-24 17:32:13 +02:00 committed by GitHub
parent 6d027d1648
commit 8a073bd9e2
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 10 additions and 35 deletions
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45
c/common/platform.h
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@ -187,14 +187,7 @@ OR:
#if (defined(__ARM_ARCH) && (__ARM_ARCH == 8)) || \
defined(__aarch64__) || defined(__ARM64_ARCH_8__)
#define BROTLI_TARGET_ARMV8_ANY
#if defined(__ARM_32BIT_STATE)
#define BROTLI_TARGET_ARMV8_32
#elif defined(__ARM_64BIT_STATE)
#define BROTLI_TARGET_ARMV8_64
#endif
#define BROTLI_TARGET_ARMV8
#endif /* ARMv8 */
#if defined(__i386) || defined(_M_IX86)
@ -217,7 +210,7 @@ OR:
#define BROTLI_64_BITS 1
#elif defined(BROTLI_BUILD_32_BIT)
#define BROTLI_64_BITS 0
#elif defined(BROTLI_TARGET_X64) || defined(BROTLI_TARGET_ARMV8_64) || \
#elif defined(BROTLI_TARGET_X64) || defined(BROTLI_TARGET_ARMV8) || \
defined(BROTLI_TARGET_POWERPC64) || defined(BROTLI_TARGET_RISCV64)
#define BROTLI_64_BITS 1
#else
@ -268,7 +261,7 @@ OR:
#if defined(BROTLI_BUILD_PORTABLE)
#define BROTLI_ALIGNED_READ (!!1)
#elif defined(BROTLI_TARGET_X86) || defined(BROTLI_TARGET_X64) || \
defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8_ANY) || \
defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8) || \
defined(BROTLI_TARGET_RISCV64)
/* Allow unaligned read only for white-listed CPUs. */
#define BROTLI_ALIGNED_READ (!!0)
@ -313,33 +306,15 @@ static BROTLI_INLINE void BrotliUnalignedWrite64(void* p, uint64_t v) {
}
#else /* BROTLI_64_BITS */
/* Avoid emitting LDRD / STRD, which require properly aligned address. */
#if BROTLI_GNUC_HAS_ATTRIBUTE(aligned, 2, 7, 0)
typedef __attribute__((aligned(1))) uint64_t unaligned_uint64_t;
static BROTLI_INLINE uint64_t BrotliUnalignedRead64(const void* p) {
return (uint64_t) ((unaligned_uint64_t*) p)[0];
const uint32_t* dwords = (const uint32_t*)p;
return dwords[0] | ((uint64_t)dwords[1] << 32);
}
static BROTLI_INLINE void BrotliUnalignedWrite64(void* p, uint64_t v) {
unaligned_uint64_t* dwords = (unaligned_uint64_t*) p;
dwords[0] = (unaligned_uint64_t) v;
uint32_t* dwords = (uint32_t *)p;
dwords[0] = (uint32_t)v;
dwords[1] = (uint32_t)(v >> 32);
}
#else /* BROTLI_GNUC_HAS_ATTRIBUTE(aligned, 2, 7, 0) */
/* Alternative way to avoid LDRD/STRD is use volatile pointers. See:
* http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka16346.html
*/
static BROTLI_INLINE uint64_t BrotliUnalignedRead64(const void* p) {
return (uint64_t) *((volatile uint32_t*) p)
| ((uint64_t) *((volatile uint32_t*) p+1) << 32);
}
static BROTLI_INLINE void BrotliUnalignedWrite64(void* p, uint64_t v) {
*((volatile uint32_t*) p) = (uint32_t) v;
*((volatile uint32_t*) p+1) = (uint32_t) (v >> 32);
}
#endif /* BROTLI_GNUC_HAS_ATTRIBUTE(aligned, 2, 7, 0) */
#endif /* BROTLI_64_BITS */
#endif /* BROTLI_ALIGNED_READ */
@ -425,7 +400,7 @@ static BROTLI_INLINE void BROTLI_UNALIGNED_STORE64LE(void* p, uint64_t v) {
#define BROTLI_IS_CONSTANT(x) (!!0)
#endif
#if defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8_ANY)
#if defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8)
#define BROTLI_HAS_UBFX (!!1)
#else
#define BROTLI_HAS_UBFX (!!0)
@ -452,7 +427,7 @@ static BROTLI_INLINE void BrotliDump(const char* f, int l, const char* fn) {
/* TODO: add appropriate icc/sunpro/arm/ibm/ti checks. */
#if (BROTLI_GNUC_VERSION_CHECK(3, 0, 0) || defined(__llvm__)) && \
!defined(BROTLI_BUILD_NO_RBIT)
#if defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8_ANY)
#if defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8)
/* TODO: detect ARMv6T2 and enable this code for it. */
static BROTLI_INLINE brotli_reg_t BrotliRBit(brotli_reg_t input) {
brotli_reg_t output;