[gcc r12-7006] rs6000/testsuite: Return 0 for powerpc_altivec_ok on other targets

[gcc r12-7006] rs6000/testsuite: Return 0 for powerpc_altivec_ok on other targets

[Segher Boessenkool]

https://gcc.gnu.org/g:14d642df2b3f0d981fd7c0d3f832b26942c49b85

commit r12-7006-g14d642df2b3f0d981fd7c0d3f832b26942c49b85
Author: Segher Boessenkool <segher@kernel.crashing.org>
Date:   Wed Feb 2 20:15:46 2022 +0000

    rs6000/testsuite: Return 0 for powerpc_altivec_ok on other targets
    
    2022-02-02  Segher Boessenkool  <segher@kernel.crashing.org>
    
    gcc/testsuite/
            * lib/target-supports.exp (check_effective_target_powerpc_altivec_ok):
            Return 0 if the target is not Power.  Restructure and add some comments.

Diff:
---
 gcc/testsuite/lib/target-supports.exp | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index cffcdb5f049..4463cc8d7ed 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -6181,21 +6181,21 @@ proc check_effective_target_powerpc_sqrt { } {
 # Return 1 if this is a PowerPC target supporting -maltivec.
 
 proc check_effective_target_powerpc_altivec_ok { } {
-    if { ([istarget powerpc*-*-*]
-         && ![istarget powerpc-*-linux*paired*])
-	 || [istarget rs6000-*-*] } {
-	# AltiVec is not supported on AIX before 5.3.
-	if { [istarget powerpc*-*-aix4*]
-	     || [istarget powerpc*-*-aix5.1*] 
-	     || [istarget powerpc*-*-aix5.2*] } {
-	    return 0
-	}
-	return [check_no_compiler_messages powerpc_altivec_ok object {
-	    int dummy;
-	} "-maltivec"]
-    } else {
-	return 0
-    }
+    # Not PowerPC, then not ok
+    if { !([istarget powerpc*-*-*] || [istarget rs6000-*-*]) } { return 0 }
+
+    # Paired Single, then not ok
+    if { [istarget powerpc-*-linux*paired*] } { return 0 }
+
+    # AltiVec is not supported on AIX before 5.3.
+    if { [istarget powerpc*-*-aix4*]
+	 || [istarget powerpc*-*-aix5.1*]
+	 || [istarget powerpc*-*-aix5.2*] } { return 0 }
+
+    # Return true iff compiling with -maltivec does not error.
+    return [check_no_compiler_messages powerpc_altivec_ok object {
+	int dummy;
+    } "-maltivec"]
 }
 
 # Return 1 if this is a PowerPC target supporting -mpower8-vector