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From: "bruno at clisp dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/114659] gcc miscompiles a __builtin_memcpy on i386, leading
 to wrong results for SNaN
Date: Tue, 09 Apr 2024 15:39:57 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114659

--- Comment #3 from Bruno Haible <bruno at clisp dot org> ---
Also reproducible in 64-bit mode, with '-mfpmath=3D387':

$ gcc -mfpmath=3D387 -Wall tf.c
$ ./a.out ; echo $?
0
$ gcc -mfpmath=3D387 -Wall -O2 tf.c
$ ./a.out ; echo $?
1

$ gcc -mfpmath=3D387 -Wall td.c
$ ./a.out ; echo $?
0
$ gcc -mfpmath=3D387 -Wall -O2 td.c
$ ./a.out ; echo $?
1=