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From: "i.nixman at autistici dot 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: Sun, 05 Mar 2023 11:18:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94756

--- Comment #15 from niXman <i.nixman at autistici dot org> ---
(In reply to Jakub Jelinek from comment #13)
> Fixed now on the trunk.  I'd wait a little bit with backports, though I
> think the gmp-param.h change doesn't need backporting.

unfortunately, the bug is still present on i686-mingw-w64.

this test has failed:

#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <quadmath.h>=20

int main(void) {
 __float128 f1, f2;
 char buffer0[50], buffer1[50];

 f1 =3D strtoflt128("1e-4941", NULL);
 f2 =3D 1e-4941Q;

 quadmath_snprintf(buffer0, 45, "%Qa", f1);
 printf("f1: %s\n", buffer0);

 quadmath_snprintf(buffer1, 45, "%Qa", f2);
 printf("f2: %s\n", buffer1);

 fflush(stdout);

 assert(strcmp(buffer0, buffer1) =3D=3D 0);

 return 0;
}



the output:
f1: 0x0.0000000cc64f1cc4376f7da08f39p-16382
f2: 0x0.000000014707e946d257f2f674b9p-16382=