From: Jan Hubicka <jh@suse.cz>
Date: Thu, 20 Jun 2002 14:46:34 +0000 (+0200)
Subject: combine.c (gen_lowpart_for_combine): Avoid calling of simplify_gen_subreg on VOIDmode.
X-Git-Tag: releases/gcc-3.1.1~124
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=309d5638767cff53e98bd1c403a24ab8e240b004;p=thirdparty%2Fgcc.git

combine.c (gen_lowpart_for_combine): Avoid calling of simplify_gen_subreg on VOIDmode.


	* combine.c (gen_lowpart_for_combine): Avoid calling of
	simplify_gen_subreg on VOIDmode.

	* combine.c (subst): Be prepared for simplify_subreg to return VOIDmode.

From-SVN: r54833
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4a2f57fb6cd5..e917679fa0c0 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+Thu Jun 20 16:41:40 CEST 2002  Jan Hubicka  <jh@suse.cz>
+
+	* combine.c (gen_lowpart_for_combine): Avoid calling of
+	simplify_gen_subreg on VOIDmode.
+
+	* combine.c (subst): Be prepared for simplify_subreg to return VOIDmode.
+
 2002-06-20  Richard Henderson  <rth@redhat.com>
 
 	* c-common.c (c_common_get_alias_set): Correctly handle characters.
diff --git a/gcc/combine.c b/gcc/combine.c
index 44bcdee6c190..acaf3b15869a 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -3539,11 +3539,12 @@ subst (x, from, to, in_dest, unique_copy)
 
 	      if (GET_CODE (new) == CONST_INT && GET_CODE (x) == SUBREG)
 		{
-		  x = simplify_subreg (GET_MODE (x), new,
+		  enum machine_mode mode = GET_MODE (x);
+		  x = simplify_subreg (mode, new,
 				       GET_MODE (SUBREG_REG (x)),
 				       SUBREG_BYTE (x));
 		  if (! x)
-		    abort ();
+		    x = gen_rtx_CLOBBER (mode, const0_rtx);
 		}
 	      else if (GET_CODE (new) == CONST_INT
 		       && GET_CODE (x) == ZERO_EXTEND)
@@ -9846,6 +9847,12 @@ gen_lowpart_for_combine (mode, x)
       int offset = 0;
       rtx res;
 
+      /* We can't handle VOIDmodes.  We can get here when generating vector
+	 modes since these, unlike integral and floating point modes are not
+	 handled earlier.  */
+      if (GET_MODE (x) == VOIDmode)
+	return gen_rtx_CLOBBER (GET_MODE (x), const0_rtx);
+
       offset = subreg_lowpart_offset (mode, GET_MODE (x));
       res = simplify_gen_subreg (mode, x, GET_MODE (x), offset);
       if (res)