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From: "mkretz at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/115575] experimental/simd/pr115454_find_last_set.cc
 FAILs
Date: Fri, 21 Jun 2024 11:07:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115575

--- Comment #5 from Matthias Kretz (Vir) <mkretz at gcc dot gnu.org> ---
Still trying to somehow verify on SPARC...

diff --git a/libstdc++-v3/testsuite/experimental/simd/pr115454_find_last_se=
t.cc
b/libstdc++-v3/testsuite/experimental/simd/pr115454_find_last_set.cc
index b47f19d3067..25a713b4e94 100644
--- a/libstdc++-v3/testsuite/experimental/simd/pr115454_find_last_set.cc
+++ b/libstdc++-v3/testsuite/experimental/simd/pr115454_find_last_set.cc
@@ -1,7 +1,7 @@
 // { dg-options "-std=3Dgnu++17" }
 // { dg-do run { target *-*-* } }
 // { dg-require-effective-target c++17 }
-// { dg-additional-options "-march=3Dx86-64-v4" { target avx512f } }
+// { dg-additional-options "-march=3Dx86-64-v4" { target avx512f_runtime }=
 }
 // { dg-require-cmath "" }

 #include <experimental/simd>
@@ -25,7 +25,9 @@ namespace stdx
 {
   using M8 =3D typename V<short, 8>::mask_type;
   using M4 =3D typename V<int, 4>::mask_type;
-  if constexpr (sizeof(M8) =3D=3D sizeof(M4))
+  if constexpr (sizeof(M8) =3D=3D sizeof(M4)
+                 && !std::is_same_v<M4, stdx::fixed_size_simd_mask<int, 4>=
>)
+    // fixed_size invariant: padding bits of masks are zero, the memcpy wo=
uld
violate that
     {
       M4 k;
       __builtin_memcpy(&__data(k), &__data(M8(true)), sizeof(M4));=