[gcc r17-3486] RISC-V: Fix zvl effective-target check cache collision

https://gcc.gnu.org/g:8335b96b21bf2866773351f906a978b8e0cf25dc

commit r17-3486-g8335b96b21bf2866773351f906a978b8e0cf25dc
Author: Jin Ma <[email protected]>
Date:   Thu Aug 20 14:09:59 2026 +0800

    RISC-V: Fix zvl effective-target check cache collision
    
    The rvv_zvl*_ok checks use the same check_runtime property despite
    testing different vector lengths.  Whichever check runs first supplies
    the cached result for all of them.  Thus a VLEN=128 check can control
    VLEN=256 tests and vice versa, causing unsupported tests to run or
    supported tests to be skipped.
    
    Give each check a unique property.  The existing tests already cover
    the affected checks and expose this order-dependent intermittent
    failure, so no new testcase is needed.
    
    gcc/testsuite/ChangeLog:
    
            * lib/target-supports.exp (check_effective_target_rvv_zvl128b_ok):
            Use a unique check_runtime property name.
            (check_effective_target_rvv_zvl256b_ok): Likewise.
            (check_effective_target_rvv_zvl_ge_256b_ok): Likewise.
            (check_effective_target_rvv_zvl512b_ok): Likewise.
    
    Signed-off-by: Jin Ma <[email protected]>

Diff:
---
 gcc/testsuite/lib/target-supports.exp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index 1727887d3f49..13a269100941 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -2177,7 +2177,7 @@ proc check_effective_target_riscv_v { } {
 proc check_effective_target_rvv_zvl128b_ok { } {
     # Check if the target has a VLENB of 16.
     set gcc_march [riscv_get_arch]
-    return [check_runtime ${gcc_march}_exec {
+    return [check_runtime ${gcc_march}_zvl128b_exec {
        int main()
        {
          int vlenb = 0;
@@ -2195,7 +2195,7 @@ proc check_effective_target_rvv_zvl128b_ok { } {
 proc check_effective_target_rvv_zvl256b_ok { } {
     # Check if the target has a VLENB of 32.
     set gcc_march [riscv_get_arch]
-    return [check_runtime ${gcc_march}_exec {
+    return [check_runtime ${gcc_march}_zvl256b_exec {
 	int main()
 	{
 	  int vlenb = 0;
@@ -2213,7 +2213,7 @@ proc check_effective_target_rvv_zvl256b_ok { } {
 proc check_effective_target_rvv_zvl_ge_256b_ok { } {
     # Check if the target has at least a VLENB of 32.
     set gcc_march [riscv_get_arch]
-    return [check_runtime ${gcc_march}_exec {
+    return [check_runtime ${gcc_march}_zvl_ge_256b_exec {
 	int main()
 	{
 	  int vlenb = 0;
@@ -2231,7 +2231,7 @@ proc check_effective_target_rvv_zvl_ge_256b_ok { } {
 proc check_effective_target_rvv_zvl512b_ok { } {
     # Check if the target has a VLENB of 64.
     set gcc_march [riscv_get_arch]
-    return [check_runtime ${gcc_march}_exec {
+    return [check_runtime ${gcc_march}_zvl512b_exec {
 	int main()
 	{
 	  int vlenb = 0;