From: Richard Sandiford <rdsandiford@googlemail.com>
Date: Wed, 28 Nov 2012 21:45:03 +0000 (+0000)
Subject: re PR tree-optimization/55052 (vect-widening tests are failing and giving wrong results)
X-Git-Tag: releases/gcc-4.8.0~1716
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=373b9e782b20f12f8d62a258b68e25f9e249124a;p=thirdparty%2Fgcc.git

re PR tree-optimization/55052 (vect-widening tests are failing and giving wrong results)

gcc/
	PR rtl-optimization/55052
	* simplify-rtx.c (simplify_subreg): Restore SCALAR_INT_MODE_P check.

From-SVN: r193909
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 83edb9b19650..b4febea6753a 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2012-11-28  Richard Sandiford  <rdsandiford@googlemail.com>
+
+	PR rtl-optimization/55052
+	* simplify-rtx.c (simplify_subreg): Restore SCALAR_INT_MODE_P check.
+
 2012-11-28  David Edelsohn  <dje.gcc@gmail.com>
 
 	* target.def (use_blocks_for_decl_p): New hook.
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index 46d9e8a1ede4..f26f0083cf6d 100644
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -5875,7 +5875,7 @@ simplify_subreg (enum machine_mode outermode, rtx op,
 
   /* A SUBREG resulting from a zero extension may fold to zero if
      it extracts higher bits that the ZERO_EXTEND's source bits.  */
-  if (GET_CODE (op) == ZERO_EXTEND)
+  if (GET_CODE (op) == ZERO_EXTEND && SCALAR_INT_MODE_P (innermode))
     {
       unsigned int bitpos = subreg_lsb_1 (outermode, innermode, byte);
       if (bitpos >= GET_MODE_PRECISION (GET_MODE (XEXP (op, 0))))