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 --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" } } */
--
2.18.1
