From: Richard Kenner <kenner@gcc.gnu.org>
Date: Thu, 10 Dec 1992 17:45:01 +0000 (-0500)
Subject: (get_last_value): Never use value from later insn, even if reg is only
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4090a6b33d502fbee5098555aca7d907e464f204;p=gcc.git

(get_last_value): Never use value from later insn, even if reg is only
set once.

From-SVN: r2856
---

diff --git a/gcc/combine.c b/gcc/combine.c
index 8d1a845ffef..9632ab294a2 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -8803,12 +8803,11 @@ get_last_value (x)
     return 0;
 
   /* If the value was set in a later insn that the ones we are processing,
-     we can't use it, but make a quick check to see if the previous insn
-     set it to something.  This is commonly the case when the same pseudo
-     is used by repeated insns.  */
+     we can't use it even if the register was only set once, but make a quick
+     check to see if the previous insn set it to something.  This is commonly
+     the case when the same pseudo is used by repeated insns.  */
 
-  if (reg_n_sets[regno] != 1
-      && INSN_CUID (reg_last_set[regno]) >= subst_low_cuid)
+  if (INSN_CUID (reg_last_set[regno]) >= subst_low_cuid)
     {
       rtx insn, set;