On Thu, 7 Nov 2013, Uros Bizjak wrote:
> [uros@localhost test]$ gcc -lm -g fpex.c
> [uros@localhost test]$ ./a.out
> Floating point exception (core dumped)
> [uros@localhost test]$ gcc -lm -g -m32 fpex.c
> [uros@localhost test]$ ./a.out
> [uros@localhost test]$
I see code of the form (testing compilation rather than execution):
flds 4(%esp)
flds 8(%esp)
fmulp %st, %st(1)
fstps 12(%esp)
where the fstps should result in the exception, and glibc uses volatile in
several places, conditional on __FLT_EVAL_METHOD__ != 0, to force a
conversion to the semantic type (whether for correct results, or to ensure
exceptions).
--
Joseph S. Myers
[email protected]
