mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 16:50:07 +00:00
107 lines
1.7 KiB
ArmAsm
107 lines
1.7 KiB
ArmAsm
/*
|
|
* Written by J.T. Conklin <jtc@netbsd.org>.
|
|
* Public domain.
|
|
*
|
|
* Correct handling of y==-inf <drepper@gnu>
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
|
|
RCSID("$NetBSD: e_scalb.S,v 1.4 1995/05/08 23:49:52 jtc Exp $")
|
|
|
|
#ifdef __ELF__
|
|
.section .rodata
|
|
#else
|
|
.text
|
|
#endif
|
|
|
|
.align ALIGNARG(4)
|
|
ASM_TYPE_DIRECTIVE(zero_nan,@object)
|
|
zero_nan:
|
|
.double 0.0
|
|
nan: .byte 0, 0, 0, 0, 0, 0, 0xff, 0x7f
|
|
minus_zero:
|
|
.byte 0, 0, 0, 0, 0, 0, 0, 0x80
|
|
.byte 0, 0, 0, 0, 0, 0, 0xff, 0x7f
|
|
ASM_SIZE_DIRECTIVE(zero_nan)
|
|
|
|
|
|
#ifdef PIC
|
|
#define MO(op) op##@GOTOFF(%ecx)
|
|
#define MOX(op,x,f) op##@GOTOFF(%ecx,x,f)
|
|
#else
|
|
#define MO(op) op
|
|
#define MOX(op,x,f) op(,x,f)
|
|
#endif
|
|
|
|
.text
|
|
ENTRY(__ieee754_scalb)
|
|
fldl 12(%esp)
|
|
fxam
|
|
fnstsw
|
|
fldl 4(%esp)
|
|
andl $0x4700, %eax
|
|
cmpl $0x0700, %eax
|
|
je 1f
|
|
andl $0x4500, %eax
|
|
cmpl $0x0100, %eax
|
|
je 2f
|
|
fxam
|
|
fnstsw
|
|
andl $0x4500, %eax
|
|
cmpl $0x0100, %eax
|
|
je 3f
|
|
fld %st(1)
|
|
frndint
|
|
fcomp %st(2)
|
|
fnstsw
|
|
sahf
|
|
jne 4f
|
|
fscale
|
|
fstp %st(1)
|
|
ret
|
|
|
|
/* y is -inf */
|
|
1: fxam
|
|
#ifdef PIC
|
|
call 1f
|
|
1: popl %ecx
|
|
addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ecx
|
|
#endif
|
|
fnstsw
|
|
movl 8(%esp), %edx
|
|
shrl $5, %eax
|
|
fstp %st
|
|
fstp %st
|
|
andl $0x80000000, %edx
|
|
andl $8, %eax
|
|
jnz 4f
|
|
shrl $27, %edx
|
|
addl %edx, %eax
|
|
fldl MOX(zero_nan, %eax, 1)
|
|
ret
|
|
|
|
/* The result is NaN, but we must not raise an exception.
|
|
So use a variable. */
|
|
2: fstp %st
|
|
fstp %st
|
|
#ifdef PIC
|
|
call 1f
|
|
1: popl %ecx
|
|
addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ecx
|
|
#endif
|
|
fldl MO(nan)
|
|
ret
|
|
|
|
/* The first parameter is a NaN. Return it. */
|
|
3: fstp %st(1)
|
|
ret
|
|
|
|
/* Return NaN and raise the invalid exception. */
|
|
4: fstp %st
|
|
fstp %st
|
|
fldz
|
|
fdiv %st
|
|
ret
|
|
END(__ieee754_scalb)
|