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* [gcc r14-2033] Change fma_reassoc_width tuning for ampere1
@ 2023-06-22 14:17 Richard Sandiford
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From: Richard Sandiford @ 2023-06-22 14:17 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:4ced8363622b31910cda61796a28fe2cbf70faa7
commit r14-2033-g4ced8363622b31910cda61796a28fe2cbf70faa7
Author: Di Zhao OS <dizhao@os.amperecomputing.com>
Date: Thu Jun 22 15:16:57 2023 +0100
Change fma_reassoc_width tuning for ampere1
This patch enables reassociation of floating-point additions on ampere1.
This brings about 1% overall benefit on spec2017 fprate cases. (There
are minor regressions in 510.parest_r and 508.namd_r, analyzed here:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110279 .)
gcc/ChangeLog:
* config/aarch64/aarch64.cc: Change fma_reassoc_width for ampere1.
Diff:
---
gcc/config/aarch64/aarch64.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index b99f12c99e9..644ebdebc0e 100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -1929,7 +1929,7 @@ static const struct tune_params ampere1_tunings =
"32:16", /* loop_align. */
2, /* int_reassoc_width. */
4, /* fp_reassoc_width. */
- 1, /* fma_reassoc_width. */
+ 4, /* fma_reassoc_width. */
2, /* vec_reassoc_width. */
2, /* min_div_recip_mul_sf. */
2, /* min_div_recip_mul_df. */
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2023-06-22 14:17 [gcc r14-2033] Change fma_reassoc_width tuning for ampere1 Richard Sandiford
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