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* [PATCH] Change fma_reassoc_width tuning for ampere1
@ 2023-06-20  3:58 Di Zhao OS
  2023-06-22 14:17 ` Richard Sandiford
  0 siblings, 1 reply; 5+ messages in thread
From: Di Zhao OS @ 2023-06-20  3:58 UTC (permalink / raw)
  To: gcc-patches

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



^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2023-07-29 14:22 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-06-20  3:58 [PATCH] Change fma_reassoc_width tuning for ampere1 Di Zhao OS
2023-06-22 14:17 ` Richard Sandiford
2023-06-22 14:23   ` Philipp Tomsich
2023-06-26 14:27     ` Richard Sandiford
2023-07-29 14:22       ` Di Zhao OS

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