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i386: Restore Skylake SImode hard register store cost

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On Skylake, we should move integer register to SSE register without
going through memory.  This patch restores Skylake SImode hard register
store cost to 6.

gcc/

	PR target/90878
	* config/i386/x86-tune-costs.h (skylake_cost): Restore SImode
	hard register store cost to 6.

gcc/testsuite/

	PR target/90878
	* gcc.target/i386/pr90878.c: New test.

From-SVN: r275906
This commit is contained in:
H.J. Lu 2019-09-18 19:50:45 +00:00 committed by H.J. Lu
parent 101a0841b6
commit 7706f2f312
4 changed files with 37 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2019-09-18 H.J. Lu <hongjiu.lu@intel.com>
PR target/90878
* config/i386/x86-tune-costs.h (skylake_cost): Restore SImode
hard register store cost to 6.
2019-09-18 H.J. Lu <hongjiu.lu@intel.com>
PR target/91446

2
gcc/config/i386/x86-tune-costs.h
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@ -1594,7 +1594,7 @@ struct processor_costs skylake_cost = {
{4, 4, 4}, /* cost of loading integer registers
in QImode, HImode and SImode.
Relative to reg-reg move (2). */
{6, 6, 3}, /* cost of storing integer registers */
{6, 6, 6}, /* cost of storing integer registers */
2, /* cost of reg,reg fld/fst */
{6, 6, 8}, /* cost of loading fp registers
in SFmode, DFmode and XFmode */

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2019-09-18 H.J. Lu <hongjiu.lu@intel.com>
PR target/90878
* gcc.target/i386/pr90878.c: New test.
2019-09-18 H.J. Lu <hongjiu.lu@intel.com>
PR target/91446

25
gcc/testsuite/gcc.target/i386/pr90878.c Normal file
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@ -0,0 +1,25 @@
/* { dg-do compile } */
/* { dg-options "-O2 -march=skylake" } */
union ieee754_float
{
float f;
struct
{
unsigned int mantissa:23;
unsigned int exponent:8;
unsigned int negative:1;
} ieee;
};
double
foo (float f)
{
union ieee754_float u;
u.f = f;
u.ieee.negative = 0;
return u.f;
}
/* { dg-final { scan-assembler-not "vcvtss2sd\[^\\n\]*\\\(%.sp\\\)" } } */