diff mbox series

Increase move cost between mask and gpr.

Message ID 20220520045958.70516-1-hongtao.liu@intel.com
State New
Headers show
Series Increase move cost between mask and gpr. | expand

Commit Message

liuhongt May 20, 2022, 4:59 a.m. UTC 
kmovd only uses port5 which is often the bottleneck of
performance. Also from latency perspective, spill and reload mostly
could be STLF or even MRN which only take 1 cycle.

So the patch increase move cost between gpr and mask to be the same as
gpr <-> sse register.

Bootstrapped and regtested on x86_64-pc-linux-gnu{-m32,}.
Ready to push to trunk.

gcc/ChangeLog:

	* config/i386/x86-tune-costs.h (skylake_cost): Increase gpr
	<-> mask cost from 5 to 6.
	(icelake_cost): Ditto.

gcc/testsuite/ChangeLog:
	* gcc.target/i386/spill_to_mask-1.c: New test.
---
 gcc/config/i386/x86-tune-costs.h                | 4 ++--
 gcc/testsuite/gcc.target/i386/spill_to_mask-1.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/gcc/config/i386/x86-tune-costs.h b/gcc/config/i386/x86-tune-costs.h
index 017ffa69958..05cbd49ec87 100644
--- a/gcc/config/i386/x86-tune-costs.h
+++ b/gcc/config/i386/x86-tune-costs.h
@@ -1866,7 +1866,7 @@  struct processor_costs skylake_cost = {
   {8, 8, 8, 12, 24},			/* cost of storing SSE registers
 					   in 32,64,128,256 and 512-bit */
   6, 6,				/* SSE->integer and integer->SSE moves */
-  5, 5,				/* mask->integer and integer->mask moves */
+  6, 6,				/* mask->integer and integer->mask moves */
   {8, 8, 8},				/* cost of loading mask register
 					   in QImode, HImode, SImode.  */
   {6, 6, 6},				/* cost if storing mask register
@@ -1992,7 +1992,7 @@  struct processor_costs icelake_cost = {
   {8, 8, 8, 12, 24},			/* cost of storing SSE registers
 					   in 32,64,128,256 and 512-bit */
   6, 6,				/* SSE->integer and integer->SSE moves */
-  5, 5,				/* mask->integer and integer->mask moves */
+  6, 6,				/* mask->integer and integer->mask moves */
   {8, 8, 8},				/* cost of loading mask register
 					   in QImode, HImode, SImode.  */
   {6, 6, 6},				/* cost if storing mask register
diff --git a/gcc/testsuite/gcc.target/i386/spill_to_mask-1.c b/gcc/testsuite/gcc.target/i386/spill_to_mask-1.c
index 94d6764fc56..be19239a685 100644
--- a/gcc/testsuite/gcc.target/i386/spill_to_mask-1.c
+++ b/gcc/testsuite/gcc.target/i386/spill_to_mask-1.c
@@ -120,7 +120,7 @@  void foo (DTYPE in[16], DTYPE out[8], const DTYPE C[16])
     out[7] += h;
 }
 
-/* { dg-final { scan-assembler "kmovd" } } */
+/* { dg-final { scan-assembler "kmovd" { xfail *-*-* } } } */
 /* { dg-final { scan-assembler-not "knot" } } */
 /* { dg-final { scan-assembler-not "kxor" } } */
 /* { dg-final { scan-assembler-not "kor" } } */