glibc/sysdeps/i386/fpu/e_scalbf.S
Ulrich Drepper 6d0c49145e Update.
* sysdeps/i386/fpu/e_scalb.S: Handle NaN as first parameter correctly.
	* sysdeps/i386/fpu/e_scalbf.S: Likewise.
	* sysdeps/i386/fpu/e_scalbl.S: Likewise.
	* math/w_scalb.c: Don't use matherr except in SVID mode.
	* math/w_scalbf.c: Likewise.
	* math/w_scalbl.c: Likewise.
	* math/test-misc.c: Add test for NaN and scalbl.
	Reported by Fred J. Tydeman <tydeman@tybor.com>.

2000-12-04  Ulrich Drepper  <drepper@redhat.com>
2000-12-05 06:36:53 +00:00

101 lines
1.6 KiB
ArmAsm

/*
* Written by J.T. Conklin <jtc@netbsd.org>.
* Public domain.
* Adapted for float type by Ulrich Drepper <drepper@cygnus.com>.
*
* Correct handling of y==-inf <drepper@gnu>
*/
#include <machine/asm.h>
RCSID("$NetBSD: $")
#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_scalbf)
flds 8(%esp)
fxam
fnstsw
flds 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 2f
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 4(%esp), %edx
shrl $5, %eax
fstp %st
fstp %st
andl $0x80000000, %edx
andl $8, %eax
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
END(__ieee754_scalbf)