From: Jeff Law <law@gcc.gnu.org>
Date: Mon, 22 Dec 1997 08:55:43 +0000 (-0700)
Subject: haifa-sched.c (create_reg_dead_note): Detect and handle another case where we kill... 
X-Git-Tag: prereleases/egcs-1.0.1-prerelease~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8cf3875bbc4bfac9a14375c3001d7c442b2a7b6f;p=thirdparty%2Fgcc.git

haifa-sched.c (create_reg_dead_note): Detect and handle another case where we kill more regs after sched than were...

        * haifa-sched.c (create_reg_dead_note): Detect and handle another
        case where we kill more regs after sched than were killed before
        sched.
        * sched.c (create_reg_dead_note): Similarly.

[[Split portion of a mixed commit.]]

From-SVN: r17182.1
---

diff --git a/gcc/haifa-sched.c b/gcc/haifa-sched.c
index 59a1190ccb04..706e585490b3 100644
--- a/gcc/haifa-sched.c
+++ b/gcc/haifa-sched.c
@@ -4462,6 +4462,23 @@ create_reg_dead_note (reg, insn)
       while (reg_note_regs < regs_killed)
 	{
 	  link = XEXP (link, 1);
+
+	  /* LINK might be zero if we killed more registers after scheduling
+	     than before, and the last hard register we kill is actually
+	     multiple hard regs. 
+
+	     This is normal for interblock scheduling, so deal with it in
+	     that case, else abort.  */
+	  if (link == NULL_RTX && current_nr_blocks <= 1)
+	    abort ();
+	  else if (link == NULL_RTX)
+	    {
+	      link = rtx_alloc (EXPR_LIST);
+	      PUT_REG_NOTE_KIND (link, REG_DEAD);
+	      XEXP (link, 0) = gen_rtx (REG, word_mode, 0);
+	      XEXP (link, 1) = NULL_RTX;
+	    }
+	     
 	  reg_note_regs += (REGNO (XEXP (link, 0)) >= FIRST_PSEUDO_REGISTER ? 1
 			    : HARD_REGNO_NREGS (REGNO (XEXP (link, 0)),
 						GET_MODE (XEXP (link, 0))));
diff --git a/gcc/sched.c b/gcc/sched.c
index b81532425742..6e9f95645c62 100644
--- a/gcc/sched.c
+++ b/gcc/sched.c
@@ -2208,6 +2208,12 @@ create_reg_dead_note (reg, insn)
 					   GET_MODE (XEXP (link, 0))));
       while (reg_note_regs < regs_killed)
 	{
+	  /* LINK might be zero if we killed more registers after scheduling
+	     than before, and the last hard register we kill is actually
+	     multiple hard regs.  */
+	  if (link == NULL_RTX)
+	    abort ();
+  
 	  link = XEXP (link, 1);
 	  reg_note_regs += (REGNO (XEXP (link, 0)) >= FIRST_PSEUDO_REGISTER ? 1
 			    : HARD_REGNO_NREGS (REGNO (XEXP (link, 0)),