[PATCH] Fix PR middle-end/52140, ICE on valid code

[Peter Bergner]

The following patch fixes an ICE when we try and generate a compare of
decimal float variables when we are not compiling for a cpu with dfp
hardware support.  This is a regression from gcc 4.4.  The patch below
bootstrapped and regression tested with no regressions on trunk, 4.6
and 4.5.  Is this ok everywhere?

I'll note that there seem to be a few other places that need this change,
but they aren't needed to fix this ICE, so I left them for a 4.8. cleanup.

Peter


gcc/
        PR middle-end/52140
        * dojump.c (do_compare_rtx_and_jump): Use SCALAR_FLOAT_MODE_P.

gcc/testsuite/
        PR middle-end/52140
        * gcc.dg/dfp/pr52140.c: New test.

Index: gcc/dojump.c
===================================================================
--- gcc/dojump.c        (revision 184032)
+++ gcc/dojump.c        (working copy)
@@ -1049,7 +1049,7 @@ do_compare_rtx_and_jump (rtx op0, rtx op
     }
   else
     {
-      if (GET_MODE_CLASS (mode) == MODE_FLOAT
+      if (SCALAR_FLOAT_MODE_P (mode)
          && ! can_compare_p (code, mode, ccp_jump)
          && can_compare_p (swap_condition (code), mode, ccp_jump))
        {
@@ -1060,7 +1060,7 @@ do_compare_rtx_and_jump (rtx op0, rtx op
          op1 = tmp;
        }
 
-      else if (GET_MODE_CLASS (mode) == MODE_FLOAT
+      else if (SCALAR_FLOAT_MODE_P (mode)
               && ! can_compare_p (code, mode, ccp_jump)
 
               /* Never split ORDERED and UNORDERED.  These must be 
implemented.  */
Index: gcc/testsuite/gcc.dg/dfp/pr52140.c
===================================================================
--- gcc/testsuite/gcc.dg/dfp/pr52140.c  (revision 0)
+++ gcc/testsuite/gcc.dg/dfp/pr52140.c  (revision 0)
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "-O1" } */
+
+/* This used to result in an ICE.  */
+
+int
+foo (_Decimal64 x, _Decimal64 y)
+{
+  return (x < y) || (x > y);
+}