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patch to fix PR59959

Message ID 52EAC3A3.6030500@redhat.com
State New
Headers show

Commit Message

Vladimir Makarov Jan. 30, 2014, 9:26 p.m. UTC 
The following patch fixes

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59959

  The patch was successfully bootstrapped and tested on x86/x86-64 and
ppc64.

Committed as rev. 207323.

2014-01-30  Vladimir Makarov  <vmakarov@redhat.com>

        PR rtl-optimization/59959
        * lra-constrains.c (simplify_operand_subreg): Assign NO_REGS to
          any reload of register whose subreg is invalid.
diff mbox

Patch

Index: lra-constraints.c
===================================================================
--- lra-constraints.c	(revision 207322)
+++ lra-constraints.c	(working copy)
@@ -1293,11 +1293,8 @@  simplify_operand_subreg (int nop, enum m
     {
       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
+      if (REG_P (reg))
+	/* There is a 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;