re PR target/41680 (ICE in trunc_int_for_mode)

	PR target/41680
	* config/i386/i386.md (split after *testqi_ext_3_rex64): Only narrow
	paradoxical subregs to prevent partial register stalls if the inner
	mode is integer mode.

	* g++.dg/torture/pr41680.C: New test.

From-SVN: r152665

gcc/ChangeLog

+2009-10-12  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/41680
+	* config/i386/i386.md (split after *testqi_ext_3_rex64): Only narrow
+	paradoxical subregs to prevent partial register stalls if the inner
+	mode is integer mode.
+
 2009-10-12  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/i386.md (*setcc_<mode>_2): Do not use ix86_expand_clear

gcc/config/i386/i386.md

@@ -8571,7 +8571,8 @@
   else if (GET_CODE (val) == SUBREG
 	   && (submode = GET_MODE (SUBREG_REG (val)),
 	       GET_MODE_BITSIZE (mode) > GET_MODE_BITSIZE (submode))
-	   && pos + len <= GET_MODE_BITSIZE (submode))
+	   && pos + len <= GET_MODE_BITSIZE (submode)
+	   && GET_MODE_CLASS (submode) == MODE_INT)
     {
       /* Narrow a paradoxical subreg to prevent partial register stalls.  */
       mode = submode;

gcc/testsuite/ChangeLog

+2009-10-12  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/41680
+	* g++.dg/torture/pr41680.C: New test.
+
 2009-10-12  Dodji Seketeli  <dodji@redhat.com>
 
 	PR c++/41570

gcc/testsuite/g++.dg/torture/pr41680.C

+// PR target/41680
+// { dg-do compile }
+
+extern void baz (float);
+
+inline bool
+bar (float x)
+{
+  union { float f; int i; } u;
+  u.f = x;
+  return (u.i & 1);
+}
+
+void
+foo (float *x)
+{
+  for (int i = 0; i < 10; i++)
+    {
+      float f = x[i];
+      if (!bar (f))
+	baz (f);
+    }
+}