{"id":2221601,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2221601/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/patch/or1pgn3hu1.fsf_-_@lxoliva.fsfla.org/","project":{"id":17,"url":"http://patchwork.ozlabs.org/api/1.1/projects/17/?format=json","name":"GNU Compiler Collection","link_name":"gcc","list_id":"gcc-patches.gcc.gnu.org","list_email":"gcc-patches@gcc.gnu.org","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"","date":"2026-04-09T22:11:02","name":"libstdc++: simd: map 64-bit long double to double on sse [PR124657]","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"e5fb9b18382686d6c40799673e94eeeb489c4fe0","submitter":{"id":74937,"url":"http://patchwork.ozlabs.org/api/1.1/people/74937/?format=json","name":"Alexandre Oliva","email":"oliva@adacore.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/gcc/patch/or1pgn3hu1.fsf_-_@lxoliva.fsfla.org/mbox/","series":[{"id":499366,"url":"http://patchwork.ozlabs.org/api/1.1/series/499366/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/list/?series=499366","date":"2026-04-09T22:11:02","name":"libstdc++: simd: map 64-bit long double to double on sse [PR124657]","version":1,"mbox":"http://patchwork.ozlabs.org/series/499366/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2221601/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2221601/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=adacore.com header.i=@adacore.com header.a=rsa-sha256\n header.s=google header.b=fsMk2luA;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=38.145.34.32; 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I \n> think this should rather map '__intrinsic_type' to \n> '[[gnu::vector_size(16/32/64)]] double'. PPC has to do a similar thing \n> (below).\n\nIndeed, I had filed PR124657 about the remaining compile failure with my\nprevious change, and your point above was exactly the solution for that\nbit. But it got me to a subsequent problem that I'm addressing in a\nlater patch.\n\n\nWhen long double is as wide as double on x86 (-mlong-double-64), make\nthe __intrinsic_type a vector of double.\n\nRegstrapped on x86_64-linux-gnu. This is not enough to enable\nexperimental/simd/pr109261_constexpr_simd.cc to compile with\n-mlong-double-64. Ok to install?\n\n\nfor libstdc++-v3/ChangeLog\n\n\tPR libstdc++/124657\n\t* include/experimental/bits/simd.h (__intrinsic_type::type):\n\tMap long double to double.\n---\n libstdc++-v3/include/experimental/bits/simd.h | 3 ++-\n 1 file changed, 2 insertions(+), 1 deletion(-)","diff":"diff --git a/libstdc++-v3/include/experimental/bits/simd.h b/libstdc++-v3/include/experimental/bits/simd.h\nindex b96818af6e6ff..8c30c8af26881 100644\n--- a/libstdc++-v3/include/experimental/bits/simd.h\n+++ b/libstdc++-v3/include/experimental/bits/simd.h\n@@ -2477,7 +2477,8 @@ template \n static constexpr size_t _S_VBytes = _Bytes <= 16 ? 16 : _Bytes <= 32 ? 32 : 64;\n \n using type [[__gnu__::__vector_size__(_S_VBytes)]]\n- = conditional_t, long long int, _Tp>;\n+ = conditional_t, long long int,\n+\t\t conditional_t, double, _Tp> >;\n };\n #endif // _GLIBCXX_SIMD_HAVE_SSE\n \n","prefixes":[]}