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re PR rtl-optimization/59915 (LRA ICE - Repeated looping over subreg reloads (gcc.c-torture/compile/simd-3.c))

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2014-01-23  Vladimir Makarov  <vmakarov@redhat.com>

	PR regression/59915
	* lra-constraints.c (simplify_operand_subreg): Spill pseudo if
	there is a danger of looping.

From-SVN: r207007
This commit is contained in:
Vladimir Makarov 2014-01-23 20:06:28 +00:00 • committed by Vladimir Makarov
parent f04dda3093
commit 6e23f29678
2 changed files with 20 additions and 3 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2014-01-23 Vladimir Makarov <vmakarov@redhat.com>
PR regression/59915
* lra-constraints.c (simplify_operand_subreg): Spill pseudo if
there is a danger of looping.
2014-01-23 Pat Haugen <pthaugen@us.ibm.com>
* config/rs6000/rs6000.c (rs6000_option_override_internal): Don't

17
gcc/lra-constraints.c
View file

@ -1291,9 +1291,20 @@ simplify_operand_subreg (int nop, enum machine_mode reg_mode)
&& ! LRA_SUBREG_P (operand))
|| CONSTANT_P (reg) || GET_CODE (reg) == PLUS || MEM_P (reg))
{
/* The class will be defined later in curr_insn_transform. */
enum reg_class rclass
= (enum reg_class) targetm.preferred_reload_class (reg, ALL_REGS);
enum reg_class rclass;
if (REG_P (reg)
&& curr_insn_set != NULL_RTX
&& (REG_P (SET_SRC (curr_insn_set))
|| GET_CODE (SET_SRC (curr_insn_set)) == SUBREG))
/* There is big probability that we will get the same class
for the new pseudo and we will get the same insn which
means infinite looping. So spill the new pseudo. */
rclass = NO_REGS;
else
/* The class will be defined later in curr_insn_transform. */
rclass
= (enum reg_class) targetm.preferred_reload_class (reg, ALL_REGS);
if (get_reload_reg (curr_static_id->operand[nop].type, reg_mode, reg,
rclass, "subreg reg", &new_reg))