IBM Z: Fix testsuite useable_hw check

This fixes various issues with the useable_hw check in s390.exp.  The
check is supposed to verify whether a testcase can be run on the
current hardware.

- the test never returned true for -m31 because vzero is not available
  in ESA mode and -m31 defaults to -mesa
- the missing v0 clobber on the vzero instruction made the check fail
  if the stack pointer got saved in f0
- the lcbb instruction used for checking whether we are on a z13
  also requires vx.  Replace it with an instruction from the generic
  instruction set extensions.
- no support for z14 and z15 so far

gcc/testsuite/ChangeLog:

2019-11-05  Andreas Krebbel  <krebbel@linux.ibm.com>

	* gcc.target/s390/s390.exp
	(check_effective_target_s390_useable_hw): Add inline asm for z14
	and z15. Replace instruction for z13 with lochiz. Add register
	clobbers. Check also for __zarch__ when doing the __VX__ test.

From-SVN: r277830

gcc/testsuite/ChangeLog

+2019-11-05  Andreas Krebbel  <krebbel@linux.ibm.com>
+
+	* gcc.target/s390/s390.exp
+	(check_effective_target_s390_useable_hw): Add inline asm for z14
+	and z15. Replace instruction for z13 with lochiz. Add register
+	clobbers. Check also for __zarch__ when doing the __VX__ test.
+
 2019-11-05  Christophe Lyon  <christophe.lyon@linaro.org>
 
 	* gcc.target/arm/attr-crypto.c: Skip if -mpure-code is used.

gcc/testsuite/gcc.target/s390/s390.exp

@@ -87,18 +87,22 @@ proc check_effective_target_s390_useable_hw { } {
 	int main (void)
 	{
 	    asm (".machinemode zarch" : : );
-	#if __ARCH__ >= 11
-	    asm ("lcbb %%r2,0(%%r15),0" : : );
+	#if __ARCH__ >= 13
+	    asm ("ncrk %%r2,%%r2,%%r2" : : : "r2");
+	#elif __ARCH__ >= 12
+	    asm ("agh %%r2,0(%%r15)" : : : "r2");
+	#elif __ARCH__ >= 11
+	    asm ("lochiz %%r2,42" : : : "r2");
 	#elif __ARCH__ >= 10
-	    asm ("risbgn %%r2,%%r2,0,0,0" : : );
+	    asm ("risbgn %%r2,%%r2,0,0,0" : : : "r2");
 	#elif __ARCH__ >= 9
-	    asm ("sgrk %%r2,%%r2,%%r2" : : );
+	    asm ("sgrk %%r2,%%r2,%%r2" : : : "r2");
 	#elif __ARCH__ >= 8
-	    asm ("rosbg %%r2,%%r2,0,0,0" : : );
+	    asm ("rosbg %%r2,%%r2,0,0,0" : : : "r2");
 	#elif __ARCH__ >= 7
-	    asm ("nilf %%r2,0" : : );
+	    asm ("nilf %%r2,0" : : : "r2");
 	#elif __ARCH__ >= 6
-	    asm ("lay %%r2,0(%%r15)" : : );
+	    asm ("lay %%r2,0(%%r15)" : : : "r2");
 	#elif __ARCH__ >= 5
 	    asm ("tam" : : );
 	#endif
@@ -108,8 +112,8 @@ proc check_effective_target_s390_useable_hw { } {
 	    asm ("etnd %0" : "=d" (nd));
 	  }
 	#endif
-	#ifdef __VX__
-	    asm ("vzero %%v0" : : );
+	#if defined (__VX__) && defined (__zarch__)
+	    asm ("vzero %%v0" : : : "v0");
 	#endif
 	  return 0;
 	}