[gcc(refs/users/meissner/heads/work250-sha)] Add future test support.

https://gcc.gnu.org/g:9bd3f592c580b402f7b25c7c7e734418ed1985b3

commit 9bd3f592c580b402f7b25c7c7e734418ed1985b3
Author: Michael Meissner <[email protected]>
Date:   Thu Jun 25 21:29:59 2026 -0400

    Add future test support.
    
    2026-06-25  Michael Meissner  <[email protected]>
    
    gcc/testsuite/
    
            * lib/target-supports.exp (check_effective_target_powerpc_future_ok):
            New target support.

Diff:
---
 gcc/testsuite/lib/target-supports.exp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index cab72c8a9e10..695bda9fefd5 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -8282,6 +8282,19 @@ proc check_htm_hw_available { } {
 	}
     }]
 }
+
+# Return 1 if this is a PowerPC target supporting -mcpu=future
+
+proc check_effective_target_powerpc_future_ok { } {
+    return [check_no_compiler_messages powerpc_future_ok object {
+	unsigned long a, b, c;
+	int main (void) {
+	    asm ("subdus %0,%1,%2" : "=r" (a) : "r" (b), "r" (c));
+	    return 0;
+	}
+    } "-mcpu=future"]
+}
+
 # Return 1 if this is a PowerPC target supporting -mcpu=cell.
 
 proc check_effective_target_powerpc_ppu_ok { } {