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 .)
Bootstrapped and tested on aarch64-unknown-linux-gnu. Is this OK for trunk?
Thanks,
Di Zhao
gcc/ChangeLog:
* config/aarch64/aarch64.cc: Change fma_reassoc_width for ampere1
---
diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index d16565b5581..301c9f6c0cd 100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -1927,7 +1927,7 @@ static const struct tune_params ampere1_tunings =
"32:12", /* 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. */
--
2.25.1
