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[PR104447] LRA: Do not split non-alloc hard regs.

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LRA tried to split non-allocated hard reg for reload pseudos again and
again until number of assignment passes reaches the limit.  The patch fixes
this.

gcc/ChangeLog:

	PR rtl-optimization/104447
	* lra-constraints.cc (spill_hard_reg_in_range): Initiate ignore
	hard reg set by lra_no_alloc_regs.

gcc/testsuite/ChangeLog:

	PR rtl-optimization/104447
	* gcc.target/i386/pr104447.c: New.
This commit is contained in:
Vladimir N. Makarov 2022-02-17 11:31:50 -05:00
parent 6bbd8afee0
commit db69f666a7
2 changed files with 15 additions and 1 deletions
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2
gcc/lra-constraints.cc
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@ -6008,7 +6008,7 @@ spill_hard_reg_in_range (int regno, enum reg_class rclass, rtx_insn *from, rtx_i
HARD_REG_SET ignore; HARD_REG_SET ignore;
lra_assert (from != NULL && to != NULL); lra_assert (from != NULL && to != NULL);
CLEAR_HARD_REG_SET (ignore); ignore = lra_no_alloc_regs;
EXECUTE_IF_SET_IN_BITMAP (&lra_reg_info[regno].insn_bitmap, 0, uid, bi) EXECUTE_IF_SET_IN_BITMAP (&lra_reg_info[regno].insn_bitmap, 0, uid, bi)
{ {
lra_insn_recog_data_t id = lra_insn_recog_data[uid]; lra_insn_recog_data_t id = lra_insn_recog_data[uid];

14
gcc/testsuite/gcc.target/i386/pr104447.c Normal file
View file

@ -0,0 +1,14 @@
/* { dg-do compile } */
/* { dg-options "-O2 -pg" } */
int
bar (int x)
{
asm goto ("" : : "r" (x), "r" (x + 1), "r" (x + 2), "r" (x + 3), /* { dg-error "operand has impossible constraints" } */
"r" (x + 4), "r" (x + 5), "r" (x + 6), "r" (x + 7),
"r" (x + 8), "r" (x + 9), "r" (x + 10), "r" (x + 11),
"r" (x + 12), "r" (x + 13), "r" (x + 14), "r" (x + 15),
"r" (x + 16) : : lab);
lab:
return 0;
}