From: Jakub Jelinek <jakub@redhat.com>
Date: Mon, 12 Oct 2009 13:35:03 +0000 (+0200)
Subject: re PR target/41680 (ICE in trunc_int_for_mode)
X-Git-Tag: releases/gcc-4.5.0~2961
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=821bdb23227503f21d8dc0e185bf1b10837b57a5;p=thirdparty%2Fgcc.git

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
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 14a918b36707..b79f323a11e6 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+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
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 43873c507eaf..22ea39cf79bf 100644
--- a/gcc/config/i386/i386.md
+++ b/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;
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 36d90f3c9004..11da3e73dd79 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+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
diff --git a/gcc/testsuite/g++.dg/torture/pr41680.C b/gcc/testsuite/g++.dg/torture/pr41680.C
new file mode 100644
index 000000000000..7faab0d5fbc7
--- /dev/null
+++ b/gcc/testsuite/g++.dg/torture/pr41680.C
@@ -0,0 +1,23 @@
+// 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);
+    }
+}