Add ppc_ieee128_ok target-supports proc

  Add a target_supports entry to check that the __ieee128 keyword
is understood by the target.
Also add a dg-requires check to the existing pr92796 testcase.

    [testsuite]
	* lib/target-supports.exp (check_effective_target_ppc_ieee128_ok): New.
	* gcc.target/powerpc/pr92796.c: Add a require-effective-target
	statement for ppc_ieee128_ok.

1 files changed, 19 insertions, 0 deletions

diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index d3b2798df3e..fb177c54aa8 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -2250,6 +2250,25 @@ proc check_ppc_float128_hw_available { } {
     }]
 }
 
+# See if the __ieee128 keyword is understood.
+proc check_effective_target_ppc_ieee128_ok { } {
+    return [check_cached_effective_target ppc_ieee128_ok {
+	# disable on AIX.
+	if { [istarget *-*-aix*] } {
+	    expr 0
+	} else {
+	    set options "-mfloat128"
+	    check_runtime_nocache ppc_ieee128_ok {
+		int main()
+		{
+		  __ieee128 a;
+		  return 0;
+		}
+	    } $options
+	}
+    }]
+}
+
 # Return 1 if the target supports executing VSX instructions, 0
 # otherwise.  Cache the result.