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