[gcc(refs/vendors/riscv/heads/gcc-15-with-riscv-opts)] RISC-V: testsuite: Add zvl requirement to PR123626.

[Jeff Law]

https://gcc.gnu.org/g:5705d4d9ed5c17c6b7069a6423305b7123d2f7c8

commit 5705d4d9ed5c17c6b7069a6423305b7123d2f7c8
Author: Robin Dapp <rdapp@oss.qualcomm.com>
Date:   Wed Jan 28 17:54:42 2026 +0100

    RISC-V: testsuite: Add zvl requirement to PR123626.
    
    This adds a new require-effective-target check to pr123626.c.
    As the test is a run test compiled with _zvl256b we need
    to ensure the target actually supports 256b vectors.
    
    We can only check for exactly 256b right now
    (rvv_zvl256b_ok), i.e. "VLS".  Therefore, the patch also adds
    a new target check rvv_zvl_ge_256b_ok where ge means greater
    or equal.
    
    gcc/testsuite/ChangeLog:
    
            * lib/target-supports.exp: Add rvv_zvl_ge_256b_ok.
            * gcc.target/riscv/rvv/base/pr123626.c: Use new target check.
    
    (cherry picked from commit a7d442ab3180fe68382f24436a7f369ae77d7898)

Diff:
---
 gcc/testsuite/gcc.target/riscv/rvv/base/pr123626.c |  2 ++
 gcc/testsuite/lib/target-supports.exp              | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/gcc/testsuite/gcc.target/riscv/rvv/base/pr123626.c b/gcc/testsuite/gcc.target/riscv/rvv/base/pr123626.c
index ddf9b065d91e..b7ef113cbcc6 100644
--- a/gcc/testsuite/gcc.target/riscv/rvv/base/pr123626.c
+++ b/gcc/testsuite/gcc.target/riscv/rvv/base/pr123626.c
@@ -1,6 +1,8 @@
 /* { dg-do run } */
 /* { dg-options "-march=rv64gcv_zvl256b -mabi=lp64d -O3 -fsigned-char -fno-strict-aliasing -fwrapv -std=gnu99" { target rv64 } } */
 /* { dg-options "-march=rv32gcv_zvl256b -mabi=ilp32 -O3 -fsigned-char -fno-strict-aliasing -fwrapv -std=gnu99" { target rv32 } } */
+/* { dg-require-effective-target rvv_zvl_ge_256b_ok } */
+
 short a;
 long long b;
 char c[3][3][17];
diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index de94d699c209..c2392505850d 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -2064,6 +2064,24 @@ proc check_effective_target_rvv_zvl256b_ok { } {
       } "-march=${gcc_march}"]
 }
 
+# Return 1 if the target runtime supports at least 256-bit
+# vectors, 0 otherwise.  Cache the result.
+
+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 ${gcc_march}_exec {
+	int main()
+	{
+	  int vlenb = 0;
+	  asm ("csrr %0,vlenb" : "=r" (vlenb) : : );
+	  if (vlenb >= 32)
+	    return 0;
+	  return 1;
+	}
+      } "-march=${gcc_march}"]
+}
+
 # Return 1 if the target runtime supports 512-bit vectors, 0 otherwise.
 # Cache the result.