95 lines
1.5 KiB
ArmAsm
95 lines
1.5 KiB
ArmAsm
/*
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* Written by J.T. Conklin <jtc@netbsd.org>.
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* Public domain.
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*
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* Correct handling of y==-inf <drepper@gnu>
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*/
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#include <machine/asm.h>
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RCSID("$NetBSD: e_scalb.S,v 1.4 1995/05/08 23:49:52 jtc Exp $")
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#ifdef __ELF__
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.section .rodata
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#else
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.text
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#endif
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.align ALIGNARG(4)
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ASM_TYPE_DIRECTIVE(zero_nan,@object)
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zero_nan:
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.double 0.0
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nan: .byte 0, 0, 0, 0, 0, 0, 0xff, 0x7f
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minus_zero:
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.byte 0, 0, 0, 0, 0, 0, 0, 0x80
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.byte 0, 0, 0, 0, 0, 0, 0xff, 0x7f
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ASM_SIZE_DIRECTIVE(zero_nan)
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#ifdef PIC
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#define MO(op) op##@GOTOFF(%ecx)
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#define MOX(op,x,f) op##@GOTOFF(%ecx,x,f)
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#else
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#define MO(op) op
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#define MOX(op,x,f) op(,x,f)
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#endif
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.text
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ENTRY(__ieee754_scalb)
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fldl 12(%esp)
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fxam
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fnstsw
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fldl 4(%esp)
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andl $0x4700, %eax
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cmpl $0x0700, %eax
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je 1f
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andl $0x4500, %eax
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cmpl $0x0100, %eax
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je 2f
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fxam
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fnstsw
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andl $0x4500, %eax
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cmpl $0x0100, %eax
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je 2f
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fld %st(1)
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frndint
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fcomp %st(2)
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fnstsw
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sahf
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jne 2f
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fscale
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fstp %st(1)
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ret
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/* y is -inf */
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1: fxam
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#ifdef PIC
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call 1f
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1: popl %ecx
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addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ecx
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#endif
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fnstsw
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movl 8(%esp), %edx
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shrl $5, %eax
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fstp %st
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fstp %st
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andl $0x80000000, %edx
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andl $8, %eax
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shrl $27, %edx
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addl %edx, %eax
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fldl MOX(zero_nan, %eax, 1)
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ret
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/* The result is NaN, but we must not raise an exception.
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So use a variable. */
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2: fstp %st
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fstp %st
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#ifdef PIC
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call 1f
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1: popl %ecx
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addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ecx
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#endif
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fldl MO(nan)
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ret
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END(__ieee754_scalb)
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