From: Uros Bizjak <ubizjak@gmail.com>
Date: Thu, 5 Aug 2010 12:03:36 +0000 (+0200)
Subject: expmed.c (expand_mult_const): Expand shift into temporary.
X-Git-Tag: releases/gcc-4.6.0~5228
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4caa21a13b14b333714d1f8dcce3adefe6fe910e;p=thirdparty%2Fgcc.git

expmed.c (expand_mult_const): Expand shift into temporary.

	* expmed.c (expand_mult_const) <case alg_shift>: Expand shift into
	temporary. Emit move from temporary to accum, so REG_EQUAL note will
	be attached to this insn in correct mode.

From-SVN: r162910
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3456501c8f91..0b0d41810576 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2010-08-05  Uros Bizjak  <ubizjak@gmail.com>
+
+	* expmed.c (expand_mult_const) <case alg_shift>: Expand shift into
+	temporary. Emit move from temporary to accum, so REG_EQUAL note will
+	be attached to this insn in correct mode.
+
 2010-08-05  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/i386.c (ix86_decompose_address): Check for SI_REG
diff --git a/gcc/expmed.c b/gcc/expmed.c
index ddace9f2e392..9aa5ff617c57 100644
--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -2904,9 +2904,11 @@ expand_mult_const (enum machine_mode mode, rtx op0, HOST_WIDE_INT val,
       switch (alg->op[opno])
 	{
 	case alg_shift:
-	  accum = expand_shift (LSHIFT_EXPR, mode, accum,
-				build_int_cst (NULL_TREE, log),
-				NULL_RTX, 0);
+	  tem = expand_shift (LSHIFT_EXPR, mode, accum,
+			      build_int_cst (NULL_TREE, log),
+			      NULL_RTX, 0);
+	  /* REG_EQUAL note will be attached to the following insn.  */
+	  emit_move_insn (accum, tem);
 	  val_so_far <<= log;
 	  break;