From: Richard Henderson <rth@redhat.com>
Date: Mon, 13 Dec 2004 02:34:14 +0000 (-0800)
Subject: re PR rtl-optimization/17186 (ICE in move_for_stack_reg, at reg-stack.c:1065)
X-Git-Tag: releases/gcc-3.4.4~423
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=088acc9597a3e54bf2bf7a227df8cf22e90fccce;p=thirdparty%2Fgcc.git

re PR rtl-optimization/17186 (ICE in move_for_stack_reg, at reg-stack.c:1065)

        PR rtl-opt/17186
        * reg-stack.c (move_for_stack_reg): Handle source register not
        live with a nan.

From-SVN: r92074
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5cb9677939bb..581e58e674eb 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2004-12-12  Richard Henderson  <rth@redhat.com>
+
+        PR rtl-opt/17186
+        * reg-stack.c (move_for_stack_reg): Handle source register not
+	live with a nan.
+
 2004-12-12  Richard Henderson  <rth@redhat.com>
 
         PR target/18932
diff --git a/gcc/reg-stack.c b/gcc/reg-stack.c
index 9a6c89bf310b..0f284ac5c53c 100644
--- a/gcc/reg-stack.c
+++ b/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.  */