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re PR rtl-optimization/55122 (ICE: maximum number of LRA constraint passes is achieved (15))

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2012-11-07  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/55122
	* lra-constraints.c (match_reload): Sync values for dead input
	pseudos.

2012-11-07  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/55122
	* gcc.dg/pr55122.c: New test.

From-SVN: r193310
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Vladimir Makarov 2012-11-07 22:11:08 +00:00 • committed by Vladimir Makarov
parent 49f20f70ef
commit 350c0fe7ea
4 changed files with 43 additions and 0 deletions
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6
gcc/ChangeLog
View file

@ -1,3 +1,9 @@
2012-11-07 Vladimir Makarov <vmakarov@redhat.com>
PR rtl-optimization/55122
* lra-constraints.c (match_reload): Sync values for dead input
pseudos.
2012-11-07 Richard Henderson <rth@redhat.com>
* trans-mem.c (pass_ipa_tm): Don't use TODO_update_ssa.

18
gcc/lra-constraints.c
View file

@ -682,6 +682,11 @@ match_reload (signed char out, signed char *ins, enum reg_class goal_class,
new_out_reg = gen_lowpart_SUBREG (outmode, reg);
else
new_out_reg = gen_rtx_SUBREG (outmode, reg, 0);
/* If the input reg is dying here, we can use the same hard
register for REG and IN_RTX. */
if (REG_P (in_rtx)
&& find_regno_note (curr_insn, REG_DEAD, REGNO (in_rtx)))
lra_reg_info[REGNO (reg)].val = lra_reg_info[REGNO (in_rtx)].val;
}
else
{
@ -698,6 +703,19 @@ match_reload (signed char out, signed char *ins, enum reg_class goal_class,
it at the end of LRA work. */
clobber = emit_clobber (new_out_reg);
LRA_TEMP_CLOBBER_P (PATTERN (clobber)) = 1;
if (GET_CODE (in_rtx) == SUBREG)
{
rtx subreg_reg = SUBREG_REG (in_rtx);
/* If SUBREG_REG is dying here and sub-registers IN_RTX
and NEW_IN_REG are similar, we can use the same hard
register for REG and SUBREG_REG. */
if (REG_P (subreg_reg) && GET_MODE (subreg_reg) == outmode
&& SUBREG_BYTE (in_rtx) == SUBREG_BYTE (new_in_reg)
&& find_regno_note (curr_insn, REG_DEAD, REGNO (subreg_reg)))
lra_reg_info[REGNO (reg)].val
= lra_reg_info[REGNO (subreg_reg)].val;
}
}
}
else

5
gcc/testsuite/ChangeLog
View file

@ -1,3 +1,8 @@
2012-11-07 Vladimir Makarov <vmakarov@redhat.com>
PR rtl-optimization/55122
* gcc.dg/pr55122.c: New test.
2012-11-07 David Edelsohn <dje.gcc@gmail.com>
* gcc.target/powerpc/pr46728-[1234578].c: Tighten regex to ignore

14
gcc/testsuite/gcc.dg/pr55122.c Normal file
View file

@ -0,0 +1,14 @@
/* PR rtl-optimization/55122 */
/* { dg-do compile } */
/* { dg-options "-O3" } */
int i, a;
unsigned long long b;
void f(void)
{
for(i = 0; i < 15; i++)
b *= b;
b *= a ? 0 : b;
}