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decode: fix NEON inclusion (#714)

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The macro that checks for NEON support should be __ARM_NEON, not
__ARM_NEON__. [1]

AArch64 compilers define __ARM_NEON but not __ARM_NEON__.
AArch32 compilers currently seem to define both, but could be within their
rights to drop __ARM_NEON__ in future versions.

This change moves the check into the common/platform.h file, checks for
both forms, and sets BROTLI_TARGET_NEON if NEON support is available.

[1] Section 6.5.4 of the ARM C Language Extensions.
    (At the time of writing, the latest version was Release 2.1.)
This commit is contained in:
Stephen Kyle 2018-10-08 14:40:11 +01:00 committed by Eugene Kliuchnikov
parent c94c6f805c
commit cc7a74f15f
2 changed files with 6 additions and 2 deletions
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4
c/common/platform.h
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@ -203,6 +203,10 @@ OR:
#endif /* ARMv8 */
#if defined(__ARM_NEON__) || defined(__ARM_NEON)
#define BROTLI_TARGET_NEON
#endif
#if defined(__i386) || defined(_M_IX86)
#define BROTLI_TARGET_X86
#endif

4
c/dec/decode.c
View File

@ -6,7 +6,7 @@
#include <brotli/decode.h>
#if defined(__ARM_NEON__)
#if defined(BROTLI_TARGET_NEON)
#include <arm_neon.h>
#endif
@ -167,7 +167,7 @@ static BrotliDecoderErrorCode DecodeWindowBits(BrotliDecoderState* s,
}
static BROTLI_INLINE void memmove16(uint8_t* dst, uint8_t* src) {
#if defined(__ARM_NEON__)
#if defined(BROTLI_TARGET_NEON)
vst1q_u8(dst, vld1q_u8(src));
#else
uint32_t buffer[4];