[APX] i386: Use setzucc by default when APX-ZU enabled

When APX-ZU enabled, all legacy setcc can directly use zu sematic to
avoid potential partial-dependency.

gcc/ChangeLog:

	* config/i386/i386.md (*setcc_qi): Force output setzucc for
	reg operand[0].
	(*setcc_qi_slp): Likewise.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/apx-zu-3.c: New test.

Author: wwwhhhyyy

gcc/config/i386/i386.md

@@ -19880,7 +19880,13 @@
 	(match_operator:QI 1 "ix86_comparison_operator"
 	  [(reg FLAGS_REG) (const_int 0)]))]
   ""
-  "set%C1\t%0"
+{
+  if (REG_P (operands[0])
+      && TARGET_APX_ZU)
+    return "setzu%C1\t%0";
+  else
+    return "set%C1\t%0";
+}
   [(set_attr "type" "setcc")
    (set_attr "mode" "QI")])
 
@@ -19889,7 +19895,12 @@
 	(match_operator:QI 1 "ix86_comparison_operator"
 	  [(reg FLAGS_REG) (const_int 0)]))]
   ""
-  "set%C1\t%0"
+{
+  if (TARGET_APX_ZU)
+    return "setzu%C1\t%0";
+  else
+    return "set%C1\t%0";
+}
   [(set_attr "type" "setcc")
    (set_attr "mode" "QI")])
 

gcc/testsuite/gcc.target/i386/apx-zu-3.c

@@ -0,0 +1,8 @@
+/* { dg-do compile { target { ! ia32 } } } */
+/* { dg-options "-mapxf -march=x86-64 -O2" } */
+/* { dg-final { scan-assembler-times "setzune" 1} } */
+
+char foo0 (int a)
+{
+  return a == 0 ? 0 : 1;
+}