From: Alan Modra <amodra@gmail.com>
Date: Wed, 4 May 2016 00:11:32 +0000 (+0930)
Subject: Combine simplify_set WORD_REGISTER_OPERATIONS
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=343d0287f2e4f0360e2c0310b48f94d695ed0e4c;p=gcc.git

Combine simplify_set WORD_REGISTER_OPERATIONS

The comment says this test is supposed to prevent "a narrower
operation than requested", but it actually only allows a larger
subreg not one the same size.  Fix that.

	* combine.c (simplify_set): Correct WORD_REGISTER_OPERATIONS test.

From-SVN: r235852
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 79fb0f48598..77d81cc5719 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2016-05-04  Alan Modra  <amodra@gmail.com>
+
+	* combine.c (simplify_set): Correct WORD_REGISTER_OPERATIONS test.
+
 2016-05-04  Alan Modra  <amodra@gmail.com>
 
 	PR target/70866
diff --git a/gcc/combine.c b/gcc/combine.c
index 0ab3f97db69..3554f515582 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -6736,7 +6736,7 @@ simplify_set (rtx x)
 	       + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD))
       && (WORD_REGISTER_OPERATIONS
 	  || (GET_MODE_SIZE (GET_MODE (src))
-	      < GET_MODE_SIZE (GET_MODE (SUBREG_REG (src)))))
+	      <= GET_MODE_SIZE (GET_MODE (SUBREG_REG (src)))))
 #ifdef CANNOT_CHANGE_MODE_CLASS
       && ! (REG_P (dest) && REGNO (dest) < FIRST_PSEUDO_REGISTER
 	    && REG_CANNOT_CHANGE_MODE_P (REGNO (dest),