> I'm experiencing a strange gfortran bug, i686-pc-mingw32 specific,
> with options -march=pentium4 -mfpmath=sse -msse.
Some more input... the bug appears when SSE sqrtsd is called, but only
if libgfortran contrusctors have been run:
cat a.s
.file "a.f90"
.section .rdata,"dr"
.align 8
LC0:
.long 0
.long 1073741824
.text
.globl _MAIN__
.def _MAIN__; .scl 2; .type 32; .endef
_MAIN__:
pushl %ebp
movl %esp, %ebp
subl $16, %esp
movsd LC0, %xmm0
movsd %xmm0, -8(%ebp)
sqrtsd -8(%ebp), %xmm0
movsd %xmm0, -8(%ebp)
leave
ret
$ gcc a.s -lgfortranbegin -lgfortran && ./a.exe
[popus up crash dialog]
$ diff a.s a_nolibgfortran.s
8,10c8,10
< .globl _MAIN__
< .def _MAIN__; .scl 2; .type 32; .endef
< _MAIN__:
---
> .globl _main
> .def _main; .scl 2; .type 32; .endef
> _main:
$ gcc a.s && ./a.exe
[works ok]
The problem appears to be inside the libgfortran constructor and
functions called herein. I'll try to narrow it, but I don't really
know what to look for... What kind of code can be expected to generate
such bad behaviour?
FX
