https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105206
--- Comment #4 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Mon, Apr 11, 2022 at 02:45:22PM +0000, kargl at gcc dot gnu.org wrote:
>
> This might be related to PR89125. The patch I attached to that PR has never
> found its way into the repository. I'll do some more testing later today.
>
Yep. This is related to PR89125. GCC does not use configure
to check for the availability of individual C99 libm functions.
After updating the patch in PR89125 for the *.c to *.cc migration
the patch gcc gives
foof:
.LFB3:
.cfi_startproc
mulss .LC0(%rip), %xmm0
jmp expf
.cfi_endproc
food:
.LFB4:
.cfi_startproc
mulsd .LC1(%rip), %xmm0
jmp exp
.cfi_endproc
fool:
.LFB5:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
fldt 16(%rbp)
popq %rbp
.cfi_def_cfa 7, 8
fldt .LC2(%rip)
fmulp %st, %st(1)
fldl2e
fmulp %st, %st(1)
fld %st(0)
frndint
fsubr %st, %st(1)
fxch %st(1)
f2xm1
fld1
faddp %st, %st(1)
fscale
fstp %st(1)
ret
.cfi_endproc
