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| author | Jan Hubicka <jh@suse.cz> | 2023-01-16 15:40:45 +0100 |
|---|---|---|
| committer | Jan Hubicka <jh@suse.cz> | 2023-01-16 15:40:45 +0100 |
| commit | 967592488c64a86f37bef3dabebb56364f14acdd (patch) | |
| tree | 72305f531b58f0231308c35d9690a92b86a6b20c /gcc/ada/exp_ch6.adb | |
| parent | 6347bbec3efb625dfc8592fbb3099dc0364c5317 (diff) | |
| download | gcc-967592488c64a86f37bef3dabebb56364f14acdd.zip gcc-967592488c64a86f37bef3dabebb56364f14acdd.tar.gz gcc-967592488c64a86f37bef3dabebb56364f14acdd.tar.bz2 | |
Disable gather/scatter for zen4
this patch adds more tunes for zen4:
- new tunes for avx512 scater instructions.
In micro benchmarks these seems consistent loss compared to open-coded coe
- disable use of gather for zen4
While these are win for a micro benchmarks (based on TSVC), enabling gather
is a loss for parest. So for now it seems safe to keep it off.
- disable pass to avoid FMA chains for znver4 since fmadd was optimized and does not seem
to cause regressions.
* config/i386/i386.cc (ix86_vectorize_builtin_scatter): Guard scatter
by TARGET_USE_SCATTER.
* config/i386/i386.h (TARGET_USE_SCATTER_2PARTS,
TARGET_USE_SCATTER_4PARTS, TARGET_USE_SCATTER): New macros.
* config/i386/x86-tune.def (TARGET_USE_SCATTER_2PARTS,
TARGET_USE_SCATTER_4PARTS, TARGET_USE_SCATTER): New tunes.
(X86_TUNE_AVOID_256FMA_CHAINS, X86_TUNE_AVOID_512FMA_CHAINS): Disable
for znver4. (X86_TUNE_USE_GATHER): Disable for zen4.
Diffstat (limited to 'gcc/ada/exp_ch6.adb')
0 files changed, 0 insertions, 0 deletions