From: Jeff Law <law@redhat.com>
Date: Fri, 14 Jun 2002 14:44:33 +0000 (-0600)
Subject: rs6000.c (rs6000_frame_related): Avoid unwanted sharing of hard registers.
X-Git-Tag: releases/gcc-3.3.0~4328
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e56c446321eafc7f19e1d7cd0ef0fa2bdfe40b5f;p=thirdparty%2Fgcc.git

rs6000.c (rs6000_frame_related): Avoid unwanted sharing of hard registers.

        * rs6000.c (rs6000_frame_related): Avoid unwanted sharing
        of hard registers.

From-SVN: r54615
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b5303fc11c4b..0109f95e15af 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2002-06-13  Jeffrey Law  <law@redhat.com>
+
+	* rs6000.c (rs6000_frame_related): Avoid unwanted sharing
+	of hard registers.
+
 2002-06-14  Ulrich Weigand  <uweigand@de.ibm.com>
 
 	* Makefile.in (libgcc.mk): Depend on specs.
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 00f9aa76754f..d9501e6d74e5 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -8666,6 +8666,14 @@ rs6000_frame_related (insn, reg, val, reg2, rreg)
 {
   rtx real, temp;
 
+  /* copy_rtx will not make unique copies of registers, so we need to
+     ensure we don't have unwanted sharing here.  */
+  if (reg == reg2)
+    reg = gen_raw_REG (GET_MODE (reg), REGNO (reg));
+
+  if (reg == rreg)
+    reg = gen_raw_REG (GET_MODE (reg), REGNO (reg));
+
   real = copy_rtx (PATTERN (insn));
 
   real = replace_rtx (real, reg,