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

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
c117dddc · Kazu Hirata · Kazu Hirata · 5053bdf8 · c117dddc · c117dddc
Commit c117dddc authored Feb 09, 2003 by Kazu Hirata Committed by Kazu Hirata Feb 09, 2003
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gcc/ChangeLog
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gcc/optabs.c
+8 -0

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--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
 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.

--- 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)