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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libquadmath/94756] strtoflt128 assigns some subnormals
 incorrectly on MS Windows
Date: Wed, 18 Jan 2023 18:40:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94756

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I can reproduce it on x86_64-linux with -m32 too:
f1: 0x0.000000014707e947d757fbf6f7p-16382
f2: 0x0.000000014707e946d257f2f674b9p-16382
but can't with -m64 nor when using glibc 2.35 strtof128 (in that case it wo=
rks
fine both with -m32 and -m64):
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <math.h>

int
main ()
{
  char buffer[48];
  _Float128 f1 =3D strtof128 ("1e-4941", NULL);
  _Float128 f2 =3D 1e-4941F128;
  strfromf128 (buffer, 45, "%a", f1);
  printf ("f1: %s\n", buffer);
  strfromf128 (buffer, 45, "%a", f2);
  printf ("f2: %s\n", buffer);
  return 0;
}=