minix/lib/libc/arch/i386/math/fpu_sw.s

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2009-12-24 21:22:41 +01:00
! fpu_compare() - compare doubles Author: Erik van der Kouwe
! fpu_sw_get() - get FPU status 17 Dec 2009
! fpu_xam() - examine double
.sect .text
.define _fpu_compare
.define _fpu_sw_get
.define _fpu_xam
! u16_t fpu_compare(double x, double y)
_fpu_compare:
! move the values onto the floating point stack
fldd 12(esp)
fldd 4(esp)
! compare values and return status word
fcompp
jmp _fpu_sw_get
! u16_t fpu_sw_get(void)
_fpu_sw_get:
! clear unused high-order word and get status word
xor eax, eax
.data1 0xdf, 0xe0 ! fnstsw ax
ret
! u16_t fpu_xam(double value)
_fpu_xam:
! move the value onto the floating point stack
fldd 4(esp)
! examine value and get status word
fxam
call _fpu_sw_get
! pop the value
fstp st
ret