From: Segher Boessenkool <segher@kernel.crashing.org>
Date: Wed, 18 Oct 2017 21:08:18 +0000 (+0200)
Subject: ira: volatile asm's are not moveable (PR82602)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9d0d0a5a1312edb8c32160c5645cf72841efa12d;p=gcc.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: r253869
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9ddb3fc5724..a139a824d35 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.
+
 2017-10-18  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/82580
diff --git a/gcc/ira.c b/gcc/ira.c
index 046ce3bc495..8c93d3df518 100644
--- a/gcc/ira.c
+++ b/gcc/ira.c
@@ -4400,6 +4400,12 @@ 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;
     }