From: Segher Boessenkool <segher@kernel.crashing.org>
Date: Wed, 18 Oct 2017 21:15:24 +0000 (+0200)
Subject: ira: volatile asm's are not moveable (PR82602)
X-Git-Tag: releases/gcc-6.5.0~732
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6fb89e62a88e66d35b0114e653ebbef44fecaa42;p=thirdparty%2Fgcc.git

ira: volatile asm's are not moveable (PR82602)

A volatile asm statement can not be moved (relative to other volatile
asm, etc.), but IRA would do it nevertheless.  This patch fixes it.


	PR rtl-optimization/82602
	* ira.c (rtx_moveable_p): Return false for volatile asm.

From-SVN: r253871
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 07255baa87bf..eec164f9b98a 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2017-10-18  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	PR rtl-optimization/82602
+	* ira.c (rtx_moveable_p): Return false for volatile asm.
+
 2017-10-17  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/82549
diff --git a/gcc/ira.c b/gcc/ira.c
index 087ba6ab1f41..d4003150bdbd 100644
--- a/gcc/ira.c
+++ b/gcc/ira.c
@@ -4405,6 +4405,12 @@ rtx_moveable_p (rtx *loc, enum op_type type)
 	 for a reason.  */
       return false;
 
+    case ASM_OPERANDS:
+      /* The same is true for volatile asm: it has unknown side effects, it
+         cannot be moved at will.  */
+      if (MEM_VOLATILE_P (x))
+	return false;
+
     default:
       break;
     }