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re PR rtl-optimization/88349 ([MIPS] Redundant store instructions generated start with r266385)

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2018-12-07  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/88349
	* ira-costs.c (record_operand_costs): Check bigger reg class on
	NO_REGS.

2018-12-07  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/88349
	* gcc.target/mips/pr88349.c: New.

From-SVN: r266894
This commit is contained in:
Vladimir Makarov 2018-12-07 16:08:17 +00:00 committed by Vladimir Makarov
parent 29f0d7d457
commit 66a0970a1f
4 changed files with 28 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2018-12-07 Vladimir Makarov <vmakarov@redhat.com>
PR rtl-optimization/88349
* ira-costs.c (record_operand_costs): Check bigger reg class on
NO_REGS.
2018-12-07 Richard Sandiford <richard.sandiford@arm.com>
* config/aarch64/aarch64-sve.md (*mul<mode>3, *v<optab><mode>3):

5
gcc/ira-costs.c
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@ -1327,8 +1327,9 @@ record_operand_costs (rtx_insn *insn, enum reg_class *pref)
fit the the hard reg class (e.g. DImode for AREG on
i386). Check this and use a bigger class to get the
right cost. */
if (! ira_hard_reg_in_set_p (other_regno, mode,
reg_class_contents[hard_reg_class]))
if (bigger_hard_reg_class != NO_REGS
&& ! ira_hard_reg_in_set_p (other_regno, mode,
reg_class_contents[hard_reg_class]))
hard_reg_class = bigger_hard_reg_class;
i = regno == (int) REGNO (src) ? 1 : 0;
for (k = cost_classes_ptr->num - 1; k >= 0; k--)

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2018-12-07 Vladimir Makarov <vmakarov@redhat.com>
PR rtl-optimization/88349
* gcc.target/mips/pr88349.c: New.
2018-12-07 Jakub Jelinek <jakub@redhat.com>
PR c++/86669

14
gcc/testsuite/gcc.target/mips/pr88349.c Normal file
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@ -0,0 +1,14 @@
/* { dg-do compile } */
/* { dg-options "-mel -mabi=32 -march=mips64r2 -fexpensive-optimizations" } */
/* { dg-skip-if "code quality test" { *-*-* } { "-O0" } { "" } } */
typedef int DI __attribute__((mode(DI)));
typedef int SI __attribute__((mode(SI)));
__attribute__((mips16)) SI
f (SI x, SI y)
{
return ((DI) x * y) >> 32;
}
/* { dg-final { scan-assembler-not "\tsw\t" } } */