From: Eric Andersen <andersen@codepoet.org>
Date: Thu, 30 Jan 2003 19:39:51 +0000 (-0000)
Subject: Fix for an optimization bug that shows up on xscale.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4508ca9bf6b3bac49379555d310e9443051c6c0b;p=buildroot.git

Fix for an optimization bug that shows up on xscale.
Problem report and patch from
    http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=8896
---

diff --git a/sources/gcc-3.2.1-arm-xscale.patch b/sources/gcc-3.2.1-arm-xscale.patch
new file mode 100644
index 0000000000..0d5588e3c0
--- /dev/null
+++ b/sources/gcc-3.2.1-arm-xscale.patch
@@ -0,0 +1,21 @@
+--- gcc-3.2.1/gcc/reload1.c.orig	2002-10-10 09:40:20.000000000 -0600
++++ gcc-3.2.1/gcc/reload1.c	2003-01-30 12:15:05.000000000 -0700
+@@ -8674,7 +8674,9 @@
+ 	 ... (MEM (PLUS (REGZ) (REGY)))... .
+ 
+ 	 First, check that we have (set (REGX) (PLUS (REGX) (REGY)))
+-	 and that we know all uses of REGX before it dies.  */
++	 and that we know all uses of REGX before it dies. 
++	 Also, explicitly check that REGX != REGY; our life information
++	 does not yet show whether REGY changes in this insn.  */
+       set = single_set (insn);
+       if (set != NULL_RTX
+ 	  && GET_CODE (SET_DEST (set)) == REG
+@@ -8684,6 +8686,7 @@
+ 	  && GET_CODE (SET_SRC (set)) == PLUS
+ 	  && GET_CODE (XEXP (SET_SRC (set), 1)) == REG
+ 	  && rtx_equal_p (XEXP (SET_SRC (set), 0), SET_DEST (set))
++	  && !rtx_equal_p (XEXP (SET_SRC (set), 1), SET_DEST (set))
+ 	  && last_label_ruid < reg_state[REGNO (SET_DEST (set))].use_ruid)
+ 	{
+ 	  rtx reg = SET_DEST (set);