m68k.md (zero_extend?i?i2 expander): Use gen_lowpart instead of doing the change by hand.

	* m68k.md (zero_extend?i?i2 expander): Use gen_lowpart instead
	of doing the change by hand.

Co-Authored-By: Jan Hubicka <jh@suse.cz>

From-SVN: r44212

gcc/ChangeLog

+Fri Jul 20 22:14:49 CEST 2001  Roman Zippel  <zippel@linux-m68k.org>
+			       Jan Hubicka  <jh@suse.cz>
+
+	* m68k.md (zero_extend?i?i2 expander): Use gen_lowpart instead
+	of doing the change by hand.
+
 Fri Jul 20 21:59:42 CEST 2001  Jan Hubicka  <jh@suse.cz>
 
 	* rtlanal.c (set_noop_p): Return true for noop jumps.

gcc/config/m68k/m68k.md

@@ -1551,11 +1551,7 @@
   "
 {
   operands[1] = make_safe_from (operands[1], operands[0]);
-  if (GET_CODE (operands[0]) == SUBREG)
-    operands[2] = gen_rtx_SUBREG (HImode, SUBREG_REG (operands[0]),
-				  SUBREG_BYTE (operands[0]));
-  else
-    operands[2] = gen_rtx_SUBREG (HImode, operands[0], 0);
+  operands[2] = gen_lowpart (HImode, operands[0]);
 }")
 
 (define_expand "zero_extendqihi2"
@@ -1567,11 +1563,7 @@
   "
 {
   operands[1] = make_safe_from (operands[1], operands[0]);
-  if (GET_CODE (operands[0]) == SUBREG)
-    operands[2] = gen_rtx_SUBREG (QImode, SUBREG_REG (operands[0]),
-				  SUBREG_BYTE (operands[0]));
-  else
-    operands[2] = gen_rtx_SUBREG (QImode, operands[0], 0);
+  operands[2] = gen_lowpart (QImode, operands[0]);
 }")
 
 (define_expand "zero_extendqisi2"
@@ -1583,11 +1575,7 @@
   "
 {
   operands[1] = make_safe_from (operands[1], operands[0]);
-  if (GET_CODE (operands[0]) == SUBREG)
-    operands[2] = gen_rtx_SUBREG (QImode, SUBREG_REG (operands[0]),
-				  SUBREG_BYTE (operands[0]));
-  else
-    operands[2] = gen_rtx_SUBREG (QImode, operands[0], 0);
+  operands[2] = gen_lowpart (QImode, operands[0]);
 }")
 
 ;; Patterns to recognize zero-extend insns produced by the combiner.