From: Roland McGrath <mcgrathr@google.com>
Date: Tue, 24 Jul 2012 11:53:14 +0000 (+0000)
Subject: arm.c (arm_get_frame_offsets): Don't use fixed regs for stack alignment padding.
X-Git-Tag: releases/gcc-4.8.0~4303
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e2a6dd68afec2aad9db7b7fa438846c02c5a245e;p=thirdparty%2Fgcc.git

arm.c (arm_get_frame_offsets): Don't use fixed regs for stack alignment padding.

2012-07-24  Roland McGrath  <mcgrathr@google.com>

	* arm.c (arm_get_frame_offsets): Don't use fixed regs for
	stack alignment padding.

From-SVN: r189807
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 08722afb81be..ecb96a5ce300 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2012-07-24  Roland McGrath  <mcgrathr@google.com>
+
+	* arm.c (arm_get_frame_offsets): Don't use fixed regs for 
+	stack alignment padding.
+
 2012-07-24  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/53961
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 376274a6cef6..ca84604ddea6 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -16178,7 +16178,11 @@ arm_get_frame_offsets (void)
 	  else
 	    for (i = 4; i <= (TARGET_THUMB1 ? LAST_LO_REGNUM : 11); i++)
 	      {
-		if ((offsets->saved_regs_mask & (1 << i)) == 0)
+		/* Avoid fixed registers; they may be changed at
+		   arbitrary times so it's unsafe to restore them
+		   during the epilogue.  */
+		if (!fixed_regs[i]
+		    && (offsets->saved_regs_mask & (1 << i)) == 0)
 		  {
 		    reg = i;
 		    break;