Hello,
I discussed this problem with Vlad in
http://gcc.gnu.org/ml/gcc/2011-05/msg00131.html. I propose the following
patch to fix it. Okay to commit?
Thanks
Hari
ChangeLog:
* ira.c (clarify_prohibited_class_mode_regs): It was running
beyond the end of REGNO_REG_CLASS array. Fixed.
Patch:
Index: gcc/ira.c
===================================================================
--- gcc/ira.c (revision 173654)
+++ gcc/ira.c (working copy)
@@ -1422,6 +1422,12 @@
if (TEST_HARD_REG_BIT (ira_prohibited_class_mode_regs[cl][j],
hard_regno))
continue;
nregs = hard_regno_nregs[hard_regno][j];
+ if (hard_regno + nregs >= FIRST_PSEUDO_REGISTER)
+ {
+ SET_HARD_REG_BIT (ira_prohibited_class_mode_regs[cl][j],
+ hard_regno);
+ continue;
+ }
pclass = ira_pressure_class_translate[REGNO_REG_CLASS
(hard_regno)];
for (nregs-- ;nregs >= 0; nregs--)
if (((enum reg_class) pclass