Gcc 3.4.4 release.

1 files changed, 13 insertions, 2 deletions

diff --git a/contrib/gcc/reg-stack.c b/contrib/gcc/reg-stack.c
index 9a6c89b..0f284ac 100644
--- a/contrib/gcc/reg-stack.c
+++ b/contrib/gcc/reg-stack.c
@@ -1060,10 +1060,21 @@ move_for_stack_reg (rtx insn, stack regstack, rtx pat)
 	    if (regstack->reg[i] == REGNO (src))
 	      break;
 
-	  /* The source must be live, and the dest must be dead.  */
-	  if (i < 0 || get_hard_regnum (regstack, dest) >= FIRST_STACK_REG)
+	  /* The destination must be dead, or life analysis is borked.  */
+	  if (get_hard_regnum (regstack, dest) >= FIRST_STACK_REG)
 	    abort ();
 
+	  /* If the source is not live, this is yet another case of
+	     uninitialized variables.  Load up a NaN instead.  */
+	  if (i < 0)
+	    {
+	      PATTERN (insn) = pat
+	        = gen_rtx_SET (VOIDmode,
+			       FP_MODE_REG (REGNO (dest), SFmode), nan);
+	      INSN_CODE (insn) = -1;
+	      return move_for_stack_reg (insn, regstack, pat);
+	    }
+
 	  /* It is possible that the dest is unused after this insn.
 	     If so, just pop the src.  */