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LRA: Implement commutative operands exchange for combining secondary memory reload and original insn

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The patch implements trying commutative operands exchange for
combining secondary memory reload and original insn.

        PR rtl-optimization/109052

gcc/ChangeLog:

	* lra-constraints.cc: (combine_reload_insn): New function.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/pr109052-2.c: New.
This commit is contained in:
Vladimir N. Makarov 2023-03-31 11:04:44 -04:00
parent a35e8042fb
commit e9910e002d
2 changed files with 27 additions and 1 deletions
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18
gcc/lra-constraints.cc
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@ -5061,7 +5061,23 @@ combine_reload_insn (rtx_insn *from, rtx_insn *to)
curr_insn = to;
curr_id = lra_get_insn_recog_data (curr_insn);
curr_static_id = curr_id->insn_static_data;
ok_p = !curr_insn_transform (true);
for (bool swapped_p = false;;)
{
ok_p = !curr_insn_transform (true);
if (ok_p || curr_static_id->commutative < 0)
break;
swap_operands (curr_static_id->commutative);
if (lra_dump_file != NULL)
{
fprintf (lra_dump_file,
" Swapping %scombined insn operands:\n",
swapped_p ? "back " : "");
dump_insn_slim (lra_dump_file, to);
}
if (swapped_p)
break;
swapped_p = true;
}
curr_insn = saved_insn;
curr_id = lra_get_insn_recog_data (curr_insn);
curr_static_id = curr_id->insn_static_data;

10
gcc/testsuite/gcc.target/i386/pr109052-2.c Normal file
View File

@ -0,0 +1,10 @@
/* { dg-do compile { target { ! ia32 } } } */
/* { dg-options "-O2 -mfpmath=both -mavx -fno-math-errno" } */
double foo (double a, double b)
{
double z = __builtin_fmod (a, 3.14);
return z * b;
}
/* { dg-final { scan-assembler-not "vmulsd\[ \t]\+%xmm\[0-9]\+, %xmm\[0-9]\+, %xmm\[0-9]\+"} } */