From: Kazu Hirata <kazu@cs.umass.edu>
Date: Sun, 9 Feb 2003 04:25:16 +0000 (+0000)
Subject: optabs.c (expand_unop): Widen clz properly when clz is done via libcall.
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c117dddced81bbf9d3f8276395a9ca9b3c51caa5;p=platform%2Fupstream%2Fgcc.git

optabs.c (expand_unop): Widen clz properly when clz is done via libcall.

	* optabs.c (expand_unop): Widen clz properly when clz is done
	via libcall.

From-SVN: r62595
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 6541d71..91d46e4 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,10 @@
 2003-02-08  Kazu Hirata  <kazu@cs.umass.edu>
 
+	* optabs.c (expand_unop): Widen clz properly when clz is done
+	via libcall.
+
+2003-02-08  Kazu Hirata  <kazu@cs.umass.edu>
+
 	* config/h8300/clzsi2.c: Replace "GNU CC" with "GCC".
 	* config/h8300/crti.asm: Likewise.
 	* config/h8300/crtn.asm: Likewise.
diff --git a/gcc/optabs.c b/gcc/optabs.c
index 6fcdb1d..226b199 100644
--- a/gcc/optabs.c
+++ b/gcc/optabs.c
@@ -2722,6 +2722,14 @@ expand_unop (mode, unoptab, op0, target, unsignedp)
 	      temp = expand_unop (wider_mode, unoptab, xop0, NULL_RTX,
 				  unsignedp);
 
+	      /* If we are generating clz using wider mode, adjust the
+		 result.  */
+	      if (unoptab == clz_optab && temp != 0)
+		temp = expand_binop (wider_mode, sub_optab, temp,
+				     GEN_INT (GET_MODE_BITSIZE (wider_mode)
+					      - GET_MODE_BITSIZE (mode)),
+				     target, true, OPTAB_DIRECT);
+
 	      if (temp)
 		{
 		  if (class != MODE_INT)