From: John David Anglin <dave.anglin@nrc-cnrc.gc.ca>
Date: Tue, 22 Jan 2008 19:39:39 +0000 (+0000)
Subject: re PR middle-end/33436 (Bad constant output with TARGET_ASM_ALIGNED_DI_OP)
X-Git-Tag: prereleases/gcc-4.2.3-rc1~12
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2ae691e46445023e4ff6986d307ebdf05f1fa345;p=thirdparty%2Fgcc.git

re PR middle-end/33436 (Bad constant output with TARGET_ASM_ALIGNED_DI_OP)

	PR middle-end/33436
	* expr.c (emit_group_load_1): Split constant double when destination
	length is half source length.

From-SVN: r131739
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4c52209fc4d5..1c3d9d110e78 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,12 @@
+2008-01-22  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
+
+	Backport:
+	2007-09-27  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
+
+	PR middle-end/33436
+	* expr.c (emit_group_load_1): Split constant double when destination
+	length is half source length.
+
 2008-01-22  Richard Guenther  <rguenther@suse.de>
 
 	PR middle-end/34739
diff --git a/gcc/expr.c b/gcc/expr.c
index 7ca1819088cf..9ef151eeb0c2 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -1739,8 +1739,25 @@ emit_group_load_1 (rtx *tmps, rtx dst, rtx orig_src, tree type, int ssize)
       else if (CONSTANT_P (src) && GET_MODE (dst) != BLKmode
                && XVECLEN (dst, 0) > 1)
         tmps[i] = simplify_gen_subreg (mode, src, GET_MODE(dst), bytepos);
-      else if (CONSTANT_P (src)
-	       || (REG_P (src) && GET_MODE (src) == mode))
+      else if (CONSTANT_P (src))
+	{
+	  HOST_WIDE_INT len = (HOST_WIDE_INT) bytelen;
+
+	  if (len == ssize)
+	    tmps[i] = src;
+	  else
+	    {
+	      rtx first, second;
+
+	      gcc_assert (2 * len == ssize);
+	      split_double (src, &first, &second);
+	      if (i)
+		tmps[i] = second;
+	      else
+		tmps[i] = first;
+	    }
+	}
+      else if (REG_P (src) && GET_MODE (src) == mode)
 	tmps[i] = src;
       else
 	tmps[i] = extract_bit_field (src, bytelen * BITS_PER_UNIT,