From: Jeffrey A Law <law@cygnus.com>
Date: Tue, 13 Jul 1999 17:03:22 +0000 (+0000)
Subject: cse.c (cse_insn): Don't put hard register source into tables for the last insn of... 
X-Git-Tag: prereleases/gcc-2.95-test~38
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d440ca8d597141afa64c02748d6172e7fa7483e6;p=thirdparty%2Fgcc.git

cse.c (cse_insn): Don't put hard register source into tables for the last insn of a libcall.

        Wed Jun 16 20:29:00 1999  J"orn Rennecke <amylaar@cygnus.co.uk>
        * cse.c (cse_insn): Don't put hard register source into tables for
        the last insn of a libcall.
Bring over from mainline sources.  Fixes various sparc lapack problems.

From-SVN: r28088
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3d6f6f19a0f6..1b2618ef8271 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,9 @@
 Tue Jul 13 10:44:14 1999  Jeffrey A Law  (law@cygnus.com)
 
+	Wed Jun 16 20:29:00 1999  J"orn Rennecke <amylaar@cygnus.co.uk>
+	* cse.c (cse_insn): Don't put hard register source into tables for
+	the last insn of a libcall.
+
 	* rs6000.c (find_addr_reg): Do not select r0 as an address
 	register.
 
diff --git a/gcc/cse.c b/gcc/cse.c
index 5fc6c7889a24..605d18507539 100644
--- a/gcc/cse.c
+++ b/gcc/cse.c
@@ -7607,7 +7607,12 @@ cse_insn (insn, libcall_insn)
 	    enum machine_mode mode
 	      = GET_MODE (src) == VOIDmode ? GET_MODE (dest) : GET_MODE (src);
 
-	    if (sets[i].src_elt == 0)
+	    /* Don't put a hard register source into the table if this is
+	       the last insn of a libcall.  */
+	    if (sets[i].src_elt == 0
+		&& (GET_CODE (src) != REG
+		    || REGNO (src) >= FIRST_PSEUDO_REGISTER
+		    || ! find_reg_note (insn, REG_RETVAL, NULL_RTX)))
 	      {
 		register struct table_elt *elt;