[gcc r12-8052] Disable float128 tests on VxWorks, PR target/104253.

[gcc r12-8052] Disable float128 tests on VxWorks, PR target/104253.

[Michael Meissner]

https://gcc.gnu.org/g:45fb78c9c456ace1d914c836d15af38ae345b902

commit r12-8052-g45fb78c9c456ace1d914c836d15af38ae345b902
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Thu Apr 7 18:25:17 2022 -0400

    Disable float128 tests on VxWorks, PR target/104253.
    
    In PR target/104253, it was pointed out the that test case added as part
    of fixing the PR does not work on VxWorks because float128 is not
    supported on that system.  I have modified the three tests for float128 so
    that they are manually excluded on VxWorks systems.  In looking at the
    code, I also added checks in check_effective_target_ppc_ieee128_ok to
    disable the systems that will never support VSX instructions which are
    required for float128 support (eabi, eabispe, darwin).
    
    2022-04-07   Michael Meissner  <meissner@linux.ibm.com>
    
    gcc/testsuite/
            PR target/104253
            * lib/target-supports.exp (check_ppc_float128_sw_available): Do
            not run float128 tests on VxWorks.
            (check_ppc_float128_hw_available): Likewise.
            (check_effective_target_ppc_ieee128_ok): Likewise.

Diff:
---
 gcc/testsuite/lib/target-supports.exp | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index ff8edbd3e17..90b90095682 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -2318,8 +2318,9 @@ proc check_ppc_mma_hw_available { } {
 proc check_ppc_float128_sw_available { } {
     return [check_cached_effective_target ppc_float128_sw_available {
 	# Some simulators are known to not support VSX/power8/power9
-	# instructions.	For now, disable on Darwin.
-	if { [istarget powerpc-*-eabi]
+	# instructions.	For now, disable on Darwin and VxWorks.
+	if { [istarget *-*-vxworks*]
+	     || [istarget powerpc-*-eabi]
 	     || [istarget powerpc*-*-eabispe]
 	     || [istarget *-*-darwin*]} {
 	    expr 0
@@ -2345,7 +2346,8 @@ proc check_ppc_float128_hw_available { } {
     return [check_cached_effective_target ppc_float128_hw_available {
 	# Some simulators are known to not support VSX/power8/power9
 	# instructions.	For now, disable on Darwin.
-	if { [istarget powerpc-*-eabi]
+	if { [istarget *-*-vxworks*]
+	     || [istarget powerpc-*-eabi]
 	     || [istarget powerpc*-*-eabispe]
 	     || [istarget *-*-darwin*]} {
 	    expr 0
@@ -2370,8 +2372,9 @@ 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*] } {
+	# disable on AIX and VxWorks.
+	if { [istarget *-*-aix*]
+	     || [istarget *-*-vxworks*]} {
 	    expr 0
 	} else {
 	    set options "-mfloat128"