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101 lines
1.5 KiB
ArmAsm
101 lines
1.5 KiB
ArmAsm
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/*
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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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* Adapted for `long double' by Ulrich Drepper <drepper@cygnus.com>.
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* Adapted for x86-64 by Andreas Jaeger <aj@suse.de>
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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: $")
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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##(%rip)
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#else
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#define MO(op) op
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#endif
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.text
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ENTRY(__ieee754_scalbl)
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fldt 24(%rsp)
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fxam
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fnstsw
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fldt 8(%rsp)
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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 3f
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fld %st(1)
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frndint
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fcomip %st(2), %st
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jne 4f
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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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fnstsw
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movl 16(%rsp), %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 $0x8000, %edx
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andl $8, %eax
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jnz 4f
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shrl $11, %edx
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addl %edx, %eax
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#ifdef PIC
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lea zero_nan(%rip),%rdx
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fldl (%rdx,%rax,1)
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#else
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fldl zero_nan(%rax, 1)
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#endif
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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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fldl MO(nan)
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ret
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/* The first parameter is a NaN. Return it. */
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3: fstp %st(1)
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ret
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/* Return NaN and raise the invalid exception. */
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4: fstp %st
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fstp %st
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fldz
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fdiv %st
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ret
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END(__ieee754_scalbl)
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