From: Pavel M <pavel.morozkin@gmail.com>
To: cygwin@cygwin.com
Subject: gcc 11.1.0: printf("%.43f\n", 0x1.52f8a8e32e982p-140): printed value is incorrectly rounded
Date: Sat, 12 Jun 2021 23:45:54 +0300 [thread overview]
Message-ID: <CAL9Mx1uMOz2wfqbMpD_xfA=D9JkpFzVz6AR_DKHK34AvrGOP6w@mail.gmail.com> (raw)
Sample code (t903.c):
#include <stdio.h>
int main(void)
{
printf("%.43f\n", 0x1.52f8a8e32e982p-140);
return 0;
}
Invocations:
# gcc on Windows 10 (Cygwin)
$ gcc t903.c -Wall -Wextra -std=c11 -pedantic -Wfatal-errors && ./a.exe
0.0000000000000000000000000000000000000000010
$ gcc --version
gcc (GCC) 11.1.0
# gcc on Linux
$ gcc t903.c -Wall -Wextra -std=c11 -pedantic -Wfatal-errors && ./a.exe
0.0000000000000000000000000000000000000000009
# clang on Windows
$ clang t903.c -Wall -Wextra -std=c11 -ffp-model=strict -pedantic
-Wfatal-errors && ./a.exe
0.0000000000000000000000000000000000000000009
# cl on Windows
$ cl t903.c /std:c11 /Za /fp:strict && ./t903.exe
0.0000000000000000000000000000000000000000009
next reply other threads:[~2021-06-12 20:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-12 20:45 Pavel M [this message]
2021-06-13 9:42 ` Achim Gratz
2021-06-13 19:19 ` Brian Inglis
2021-11-03 21:07 ` Pavel M
2021-11-03 21:09 ` Pavel M
[not found] ` <CAL9Mx1utCxXFPy3vOK0ZOkX2qzt8ntQ0LEyD4WvLpCRRbTLYeQ@mail.gmail.com>
2021-11-03 21:32 ` Pavel M
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