[PATCH] rs6000: Add target supports for "future" system

[Bill Schmidt]

Hi,

This patch from Mike Meissner adds procs to target-supports.exp to support 
-mcpu=future.

Tested in conjunction with the next patch (test cases) with no problems.
Is this okay for trunk?

Thanks,
Bill


2019-05-29  Michael Meissner  <meiss...@linux.ibm.com>

        * lib/target-supports.exp (check_powerpc_future_hw_available):
        New.
        (check_effective_target_powerpc_future_ok): New.


diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index 3bd6e815715..982ec8ccc09 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -2140,6 +2140,25 @@ proc check_p9modulo_hw_available { } {
     }]
 }
 
+
+# Return 1 if the target supports executing FUTURE instructions, 0 otherwise.
+# Cache the result.  It is assumed that if a simulator does not support the
+# FUTURE instructions, that it will generate an error and this test will fail.
+
+proc check_powerpc_future_hw_available { } {
+    return [check_cached_effective_target powerpc_future_hw_available {
+       check_runtime_nocache powerpc_future_hw_available {
+           int main()
+           {
+               /* Set e first and use +r to check if pli actually works.  */
+               long e = -1;
+               asm ("pli %0,%1" : "+r" (e) : "n" (0x12345));
+               return (e == 0x12345);
+           }
+       } "-mfuture"
+    }]
+}
+
 # Return 1 if the target supports executing __float128 on PowerPC via software
 # emulation, 0 otherwise.  Cache the result.
 
@@ -5123,6 +5142,24 @@ proc check_effective_target_powerpc_p9modulo_ok { } {
     }
 }
 
+# Return 1 if this is a PowerPC target supporting -mfuture.
+# Limit this to 64-bit linux systems for now until other
+# targets support FUTURE.
+
+proc check_effective_target_powerpc_future_ok { } {
+    if { ([istarget powerpc64*-*-linux*]) } {
+       return [check_no_compiler_messages powerpc_future_ok object {
+           int main (void) {
+               long e;
+               asm ("pli %0,%1" : "=r" (e) : "n" (0x12345));
+               return e;
+           }
+       } "-mfuture"]
+    } else {
+       return 0
+    }
+}
+
 # Return 1 if this is a PowerPC target supporting -mfloat128 via either
 # software emulation on power7/power8 systems or hardware support on power9.