From: Ulrich Weigand <uweigand@de.ibm.com>
Date: Fri, 28 Mar 2014 12:42:40 +0000 (+0000)
Subject: rs6000.c (fusion_gpr_load_p): Refuse optimization if it would clobber the stack point... 
X-Git-Tag: upstream/12.2.0~64070
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bd302a183af5190fb504174099a9085c3859bc93;p=platform%2Fupstream%2Fgcc.git

rs6000.c (fusion_gpr_load_p): Refuse optimization if it would clobber the stack pointer, even temporarily.

	* config/rs6000/rs6000.c (fusion_gpr_load_p): Refuse optimization
	if it would clobber the stack pointer, even temporarily.

From-SVN: r208895
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index faca258..82f387c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2014-03-28  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>
+
+	* config/rs6000/rs6000.c (fusion_gpr_load_p): Refuse optimization
+	if it would clobber the stack pointer, even temporarily.
+
 2014-03-28  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* mode-switching.c: Make small adjustments to the top comment.
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index cd85257..d9606a1 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -32523,6 +32523,11 @@ fusion_gpr_load_p (rtx *operands, bool peep2_p)
 
       if (!peep2_reg_dead_p (2, addis_reg))
 	return false;
+
+      /* If the target register being loaded is the stack pointer, we must
+         avoid loading any other value into it, even temporarily.  */
+      if (REG_P (target) && REGNO (target) == STACK_POINTER_REGNUM)
+	return false;
     }
 
   base_reg = XEXP (addr, 0);