On 1/20/2015 7:39 PM, YX Hao wrote:
This serial of functions in 'math.h' all use "st":
http://en.cppreference.com/w/c/numeric/math/rint
and
http://blogs.msdn.com/b/vcblog/archive/2013/07/19/c99-library-support-in-visual-studio-2013.aspx
----- Original Message ----- From: "Sergey Korshunoff"
Sent: Tuesday, January 20, 2015 4:41 PM
I'm assumed that "st" register can be considered by tcc as "memory"
specification. This assumption allowed me to build a nimrod compiler
for windows. Not tested if it works.
fistpl pops the stack, so the entire 8087 stack (st) is clobbered.
2015-01-19 14:37 GMT+03:00, YX Hao
Hi,
From: "Sergey Korshunoff"
Sent: Monday, January 19, 2015 1:14 AM
Hi! Another question: Compiling a nimrod compiler by
i386-win-tcc I
got the following error:
/usr/local/lib/win32/include/math.h:541: error: invalid clobber
register
'st'
Go into include/math.h:541:
__CRT_INLINE long __cdecl lrint (double x)
{
long retval;
__asm__ __volatile__ \
("fistpl %0" : "=m" (retval) : "t" (x) : "st"); \
return retval;
}
__asm__ __volatile__("Instruction List" : Output : Input :
Clobber/Modify);
Guide to Inline Assembly:
http://www.delorie.com/djgpp/doc/brennan/brennan_att_inline_djgpp.html
Clobber List:
http://www.ibiblio.org/gferg/ldp/GCC-Inline-Assembly-HOWTO.html#ss5.3
st:
http://sourceware.org/binutils/docs-2.25/as/i386_002dRegs.html#i386_002dRegs
Anyone know more abount it?
--
Cheers,
Kein-Hong Man (esq.)
Kuala Lumpur, Malaysia
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