forked from KolibriOS/kolibrios
72 lines
1.2 KiB
ArmAsm
72 lines
1.2 KiB
ArmAsm
/*
|
|
Cephes Math Library Release 2.7: May, 1998
|
|
Copyright 1984, 1987, 1988, 1992, 1998 by Stephen L. Moshier
|
|
|
|
Extracted from floorl.387 for use in libmingwex.a by
|
|
Danny Smith <dannysmith@users.sourceforge.net>
|
|
2002-06-20
|
|
*/
|
|
|
|
/*
|
|
* frexpl(long double x, int* expnt) extracts the exponent from x.
|
|
* It returns an integer power of two to expnt and the significand
|
|
* between 0.5 and 1 to y. Thus x = y * 2**expn.
|
|
*/
|
|
.align 2
|
|
.globl _frexpl
|
|
_frexpl:
|
|
pushl %ebp
|
|
movl %esp,%ebp
|
|
subl $24,%esp
|
|
pushl %esi
|
|
pushl %ebx
|
|
fldt 8(%ebp)
|
|
movl 20(%ebp),%ebx
|
|
fld %st(0)
|
|
fstpt -12(%ebp)
|
|
leal -4(%ebp),%ecx
|
|
movw -4(%ebp),%dx
|
|
andl $32767,%edx
|
|
jne L25
|
|
fldz
|
|
fucompp
|
|
fnstsw %ax
|
|
andb $68,%ah
|
|
xorb $64,%ah
|
|
jne L21
|
|
movl $0,(%ebx)
|
|
fldz
|
|
jmp L24
|
|
.align 2,0x90
|
|
.align 2,0x90
|
|
L21:
|
|
fldt -12(%ebp)
|
|
fadd %st(0),%st
|
|
fstpt -12(%ebp)
|
|
decl %edx
|
|
movw (%ecx),%si
|
|
andl $32767,%esi
|
|
jne L22
|
|
cmpl $-66,%edx
|
|
jg L21
|
|
L22:
|
|
addl %esi,%edx
|
|
jmp L19
|
|
.align 2,0x90
|
|
L25:
|
|
fstp %st(0)
|
|
L19:
|
|
addl $-16382,%edx
|
|
movl %edx,(%ebx)
|
|
movw (%ecx),%ax
|
|
andl $-32768,%eax
|
|
orl $16382,%eax
|
|
movw %ax,(%ecx)
|
|
fldt -12(%ebp)
|
|
L24:
|
|
leal -32(%ebp),%esp
|
|
popl %ebx
|
|
popl %esi
|
|
leave
|
|
ret
|