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From: "rcopley at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/109359] New: Compile-time rounding of double literal to float is incorrect with -frounding-math Date: Fri, 31 Mar 2023 12:33:56 +0000 [thread overview] Message-ID: <bug-109359-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109359 Bug ID: 109359 Summary: Compile-time rounding of double literal to float is incorrect with -frounding-math Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: rcopley at gmail dot com Target Milestone: --- The following program should print: 0.001914 0.630538 With "g++ -frounding-math", it prints instead: -8023756970655744.000000 0.872496 This bug is present in trunk, and since gcc 12.1, and does not appear to be platform specific. Compiler explorer link: https://godbolt.org/z/aMhcYcY66 #include <cstdio> float xs[] = {0.001914, 0.630539}; int main() { std::size_t size = sizeof xs / sizeof xs[0]; for (std::size_t i = 0; i != size; ++i) { std::printf("%f\n", xs[i]); } }
next reply other threads:[~2023-03-31 12:33 UTC|newest] Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-03-31 12:33 rcopley at gmail dot com [this message] 2023-03-31 13:23 ` [Bug c++/109359] [12/13 Regression] " rguenth at gcc dot gnu.org 2023-03-31 13:36 ` jakub at gcc dot gnu.org 2023-03-31 14:23 ` jakub at gcc dot gnu.org 2023-04-14 9:49 ` rguenth at gcc dot gnu.org 2023-04-14 10:03 ` jakub at gcc dot gnu.org 2023-04-14 10:08 ` rguenth at gcc dot gnu.org 2023-04-14 10:12 ` jakub at gcc dot gnu.org 2023-05-08 12:26 ` [Bug c++/109359] [12/13/14 " rguenth at gcc dot gnu.org 2024-02-05 18:24 ` jason at gcc dot gnu.org 2024-02-05 18:34 ` [Bug c++/109359] [12/13 " jason at gcc dot gnu.org 2024-02-05 18:47 ` jakub at gcc dot gnu.org 2024-02-05 18:55 ` jason at gcc dot gnu.org 2024-02-05 21:35 ` cvs-commit at gcc dot gnu.org 2024-02-05 22:25 ` cvs-commit at gcc dot gnu.org 2024-02-05 22:25 ` cvs-commit at gcc dot gnu.org 2024-02-05 22:26 ` jason at gcc dot gnu.org
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