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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113679] long long minus double with gcc -m32 produces
 different results than other compilers or gcc -m64
Date: Wed, 31 Jan 2024 08:52:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113679

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---

[apinski@xeond2 gcc]$ ~/upstream-gcc/bin/gcc -m32  tr56.c
[apinski@xeond2 gcc]$ ./a.out
-2.000000
[apinski@xeond2 gcc]$ ~/upstream-gcc/bin/gcc -m32  tr56.c
-fexcess-precision=3Dstandard
[apinski@xeond2 gcc]$ ./a.out
0.000000
[apinski@xeond2 gcc]$ ~/upstream-gcc/bin/gcc -m32  tr56.c -msse2 -mfpmath=
=3Dsse
[apinski@xeond2 gcc]$ ./a.out
0.000000


Yes it is due to excessive precision of x87. Use either
`-fexcess-precision=3Dstandard` or `-msse2 -mfpmath=3Dsse` if you don't wan=
t to use
the execessive precision of the x87 FP.

*** This bug has been marked as a duplicate of bug 323 ***=