From: Alexandre Oliva <aoliva@redhat.com>
Date: Fri, 1 Dec 2000 01:08:40 +0000 (+0000)
Subject: combine.c (try_combine): Disregard USEs when updating LOG_LINKS of subsequent insns.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=95ac07b0f4d9916c7a850e3b427cbc768819d742;p=gcc.git

combine.c (try_combine): Disregard USEs when updating LOG_LINKS of subsequent insns.

* combine.c (try_combine): Disregard USEs when updating LOG_LINKS
of subsequent insns.

From-SVN: r37905
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 44f8a1f5791..93b0f9de196 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2000-11-30  Alexandre Oliva  <aoliva@redhat.com>
+
+	* combine.c (try_combine): Disregard USEs when updating LOG_LINKS
+	of subsequent insns.
+
 2000-11-30  Richard Henderson  <rth@redhat.com>
 
 	* config/alpha/alpha.h (ASM_OUTPUT_MI_THUNK): Disable.
diff --git a/gcc/combine.c b/gcc/combine.c
index df773aacdd6..1946ba2d3a1 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -2553,7 +2553,8 @@ try_combine (i3, i2, i1, new_direct_jump_p)
     if (i3_subst_into_i2 && GET_CODE (PATTERN (i2)) == PARALLEL)
       {
 	for (i = 0; i < XVECLEN (PATTERN (i2), 0); i++)
-	  if (GET_CODE (SET_DEST (XVECEXP (PATTERN (i2), 0, i))) == REG
+	  if (GET_CODE (XVECEXP (PATTERN (i2), 0, i)) != USE
+	      && GET_CODE (SET_DEST (XVECEXP (PATTERN (i2), 0, i))) == REG
 	      && SET_DEST (XVECEXP (PATTERN (i2), 0, i)) != i2dest
 	      && ! find_reg_note (i2, REG_UNUSED,
 				  SET_DEST (XVECEXP (PATTERN (i2), 0, i))))