libstdc++: Require SSE2 for std::simd [PR124722]

Without SSE2 double precision uses excess precision, leading to test failures. For now, std::simd remains a tech preview that simply is disabled without SSE2. libstdc++-v3/ChangeLog: PR libstdc++/124722 * include/bits/version.def: Check for __SSE2__ rather than x86. * include/bits/version.h: Regenerate. * testsuite/std/simd/arithmetic.cc: Build with -msse2. * testsuite/std/simd/arithmetic_expensive.cc: Likewise. * testsuite/std/simd/creation.cc: Likewise. * testsuite/std/simd/creation_expensive.cc: Likewise. * testsuite/std/simd/loads.cc: Likewise. * testsuite/std/simd/loads_expensive.cc: Likewise. * testsuite/std/simd/mask.cc: Likewise. * testsuite/std/simd/mask2.cc: Likewise. * testsuite/std/simd/mask2_expensive.cc: Likewise. * testsuite/std/simd/mask_expensive.cc: Likewise. * testsuite/std/simd/reductions.cc: Likewise. * testsuite/std/simd/reductions_expensive.cc: Likewise. * testsuite/std/simd/shift_left.cc: Likewise. * testsuite/std/simd/shift_left_expensive.cc: Likewise. * testsuite/std/simd/shift_right.cc: Likewise. * testsuite/std/simd/shift_right_expensive.cc: Likewise. * testsuite/std/simd/simd_alg.cc: Likewise. * testsuite/std/simd/simd_alg_expensive.cc: Likewise. * testsuite/std/simd/sse_intrin.cc: Likewise. * testsuite/std/simd/stores.cc: Likewise. * testsuite/std/simd/stores_expensive.cc: Likewise. * testsuite/std/simd/traits_common.cc: Likewise. * testsuite/std/simd/traits_math.cc: Likewise. Signed-off-by: Matthias Kretz <m.kretz@gsi.de>
2026-05-06 14:59:39 +02:00 · 2026-04-04 11:40:38 +02:00
parent 7660e30674
commit 1cfdd868ce
25 changed files with 25 additions and 2 deletions
--- a/libstdc++-v3/include/bits/version.def
+++ b/libstdc++-v3/include/bits/version.def
@@ -2359,7 +2359,7 @@ ftms = {
    cxxmin = 26;
    extra_cond = "__cpp_structured_bindings >= 202411L "
    "&& __cpp_expansion_statements >= 202411L "
-    "&& (__x86_64__ || __i386__)"; // TODO: lift initial restriction to x86
+    "&& __SSE2__"; // TODO: add more targets
    hosted = yes;
  };
 };
--- a/libstdc++-v3/include/bits/version.h
+++ b/libstdc++-v3/include/bits/version.h
@@ -2627,7 +2627,7 @@
 #undef __glibcxx_want_contracts

 #if !defined(__cpp_lib_simd)
-# if (__cplusplus >  202302L) && _GLIBCXX_HOSTED && (__cpp_structured_bindings >= 202411L && __cpp_expansion_statements >= 202411L && (__x86_64__ || __i386__))
+# if (__cplusplus >  202302L) && _GLIBCXX_HOSTED && (__cpp_structured_bindings >= 202411L && __cpp_expansion_statements >= 202411L && __SSE2__)
 #  define __glibcxx_simd 202506L
 #  if defined(__glibcxx_want_all) || defined(__glibcxx_want_simd)
 #  endif
--- a/libstdc++-v3/testsuite/std/simd/arithmetic.cc
+++ b/libstdc++-v3/testsuite/std/simd/arithmetic.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }

 #include "test_setup.h"

--- a/libstdc++-v3/testsuite/std/simd/arithmetic_expensive.cc
+++ b/libstdc++-v3/testsuite/std/simd/arithmetic_expensive.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }
 // { dg-timeout-factor 2 }
 // { dg-require-effective-target run_expensive_tests }

--- a/libstdc++-v3/testsuite/std/simd/creation.cc
+++ b/libstdc++-v3/testsuite/std/simd/creation.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }

 #include "test_setup.h"

--- a/libstdc++-v3/testsuite/std/simd/creation_expensive.cc
+++ b/libstdc++-v3/testsuite/std/simd/creation_expensive.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }
 // { dg-timeout-factor 2 }
 // { dg-require-effective-target run_expensive_tests }

--- a/libstdc++-v3/testsuite/std/simd/loads.cc
+++ b/libstdc++-v3/testsuite/std/simd/loads.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }

 #include "test_setup.h"
 #include <numeric>
--- a/libstdc++-v3/testsuite/std/simd/loads_expensive.cc
+++ b/libstdc++-v3/testsuite/std/simd/loads_expensive.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }
 // { dg-timeout-factor 2 }
 // { dg-require-effective-target run_expensive_tests }

--- a/libstdc++-v3/testsuite/std/simd/mask.cc
+++ b/libstdc++-v3/testsuite/std/simd/mask.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }

 #include "test_setup.h"
 #include <utility>
--- a/libstdc++-v3/testsuite/std/simd/mask2.cc
+++ b/libstdc++-v3/testsuite/std/simd/mask2.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }

 #include "test_setup.h"
 #include <utility>
--- a/libstdc++-v3/testsuite/std/simd/mask2_expensive.cc
+++ b/libstdc++-v3/testsuite/std/simd/mask2_expensive.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }
 // { dg-require-effective-target run_expensive_tests }
 // { dg-timeout-factor 2 }

--- a/libstdc++-v3/testsuite/std/simd/mask_expensive.cc
+++ b/libstdc++-v3/testsuite/std/simd/mask_expensive.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }
 // { dg-timeout-factor 2 }
 // { dg-require-effective-target run_expensive_tests }

--- a/libstdc++-v3/testsuite/std/simd/reductions.cc
+++ b/libstdc++-v3/testsuite/std/simd/reductions.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }

 #include "test_setup.h"

--- a/libstdc++-v3/testsuite/std/simd/reductions_expensive.cc
+++ b/libstdc++-v3/testsuite/std/simd/reductions_expensive.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }
 // { dg-timeout-factor 2 }
 // { dg-require-effective-target run_expensive_tests }

--- a/libstdc++-v3/testsuite/std/simd/shift_left.cc
+++ b/libstdc++-v3/testsuite/std/simd/shift_left.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }

 #include "test_setup.h"

--- a/libstdc++-v3/testsuite/std/simd/shift_left_expensive.cc
+++ b/libstdc++-v3/testsuite/std/simd/shift_left_expensive.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }
 // { dg-timeout-factor 2 }
 // { dg-require-effective-target run_expensive_tests }

--- a/libstdc++-v3/testsuite/std/simd/shift_right.cc
+++ b/libstdc++-v3/testsuite/std/simd/shift_right.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }

 #include "test_setup.h"

--- a/libstdc++-v3/testsuite/std/simd/shift_right_expensive.cc
+++ b/libstdc++-v3/testsuite/std/simd/shift_right_expensive.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }
 // { dg-timeout-factor 2 }
 // { dg-require-effective-target run_expensive_tests }

--- a/libstdc++-v3/testsuite/std/simd/simd_alg.cc
+++ b/libstdc++-v3/testsuite/std/simd/simd_alg.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }

 #include "test_setup.h"
 #include <utility>
--- a/libstdc++-v3/testsuite/std/simd/simd_alg_expensive.cc
+++ b/libstdc++-v3/testsuite/std/simd/simd_alg_expensive.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }
 // { dg-timeout-factor 2 }
 // { dg-require-effective-target run_expensive_tests }

--- a/libstdc++-v3/testsuite/std/simd/sse_intrin.cc
+++ b/libstdc++-v3/testsuite/std/simd/sse_intrin.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }

 #include "test_setup.h"

--- a/libstdc++-v3/testsuite/std/simd/stores.cc
+++ b/libstdc++-v3/testsuite/std/simd/stores.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }

 #include "test_setup.h"

--- a/libstdc++-v3/testsuite/std/simd/stores_expensive.cc
+++ b/libstdc++-v3/testsuite/std/simd/stores_expensive.cc
@@ -1,5 +1,6 @@
 // { dg-do run { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }
 // { dg-timeout-factor 2 }
 // { dg-require-effective-target run_expensive_tests }

--- a/libstdc++-v3/testsuite/std/simd/traits_common.cc
+++ b/libstdc++-v3/testsuite/std/simd/traits_common.cc
@@ -1,5 +1,6 @@
 // { dg-do compile { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }
 // { dg-timeout-factor 2 }

 #include <simd>
--- a/libstdc++-v3/testsuite/std/simd/traits_math.cc
+++ b/libstdc++-v3/testsuite/std/simd/traits_math.cc
@@ -1,5 +1,6 @@
 // { dg-do compile { target c++26 } }
 // { dg-require-effective-target x86 }
+// { dg-additional-options "-msse2" }

 #include <simd>
 #include <stdfloat>