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| author | Wilco Dijkstra <wdijkstr@arm.com> | 2020-01-20 13:09:15 +0000 |
|---|---|---|
| committer | Wilco Dijkstra <wdijkstr@arm.com> | 2020-01-20 13:09:15 +0000 |
| commit | 35e58efb7a86a66c6e93dac3d197eef95963582d (patch) | |
| tree | 2e988921f4237c1436c07732430a00cba4bc521e | |
| parent | 7387153ca14a75fc96a0d58e3d2613ef96e15813 (diff) | |
| download | gcc-35e58efb7a86a66c6e93dac3d197eef95963582d.zip gcc-35e58efb7a86a66c6e93dac3d197eef95963582d.tar.gz gcc-35e58efb7a86a66c6e93dac3d197eef95963582d.tar.bz2 | |
[AArch64] Set SLOW_BYTE_ACCESS
Contrary to all documentation, SLOW_BYTE_ACCESS simply means accessing
bitfields by their declared type, which results in better codegeneration.
gcc/
* config/aarch64/aarch64.h (SLOW_BYTE_ACCESS): Set to 1.
| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/config/aarch64/aarch64.h | 10 |
2 files changed, 6 insertions, 8 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index f955514..ce26404 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,7 @@ +2020-01-20 Wilco Dijkstra <wdijkstr@arm.com> + + * config/aarch64/aarch64.h (SLOW_BYTE_ACCESS): Set to 1. + 2020-01-20 Richard Sandiford <richard.sandiford@arm.com> * config/aarch64/aarch64-sve-builtins-base.cc diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h index eac2d62..342fe29 100644 --- a/gcc/config/aarch64/aarch64.h +++ b/gcc/config/aarch64/aarch64.h @@ -1006,14 +1006,8 @@ typedef struct if given data not on the nominal alignment. */ #define STRICT_ALIGNMENT TARGET_STRICT_ALIGN -/* Define this macro to be non-zero if accessing less than a word of - memory is no faster than accessing a word of memory, i.e., if such - accesses require more than one instruction or if there is no - difference in cost. - Although there's no difference in instruction count or cycles, - in AArch64 we don't want to expand to a sub-word to a 64-bit access - if we don't have to, for power-saving reasons. */ -#define SLOW_BYTE_ACCESS 0 +/* Enable wide bitfield accesses for more efficient bitfield code. */ +#define SLOW_BYTE_ACCESS 1 #define NO_FUNCTION_CSE 1 |