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/* Compute cubic root of float value.
Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Dirk Alboth <dirka@uni-paderborn.de> and
Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <machine/asm.h>
#ifdef __ELF__
.section .rodata
#else
.text
#endif
.align ALIGNARG(4)
ASM_TYPE_DIRECTIVE(f1,@object)
f1: .double 0.492659620528969547
ASM_SIZE_DIRECTIVE(f1)
ASM_TYPE_DIRECTIVE(f2,@object)
f2: .double 0.697570460207922770
ASM_SIZE_DIRECTIVE(f2)
ASM_TYPE_DIRECTIVE(f3,@object)
f3: .double 0.191502161678719066
ASM_SIZE_DIRECTIVE(f3)
#define CBRT2 1.2599210498948731648
#define SQR_CBRT2 1.5874010519681994748
ASM_TYPE_DIRECTIVE(factor,@object)
factor: .double 1.0 / SQR_CBRT2
.double 1.0 / CBRT2
.double 1.0
.double CBRT2
.double SQR_CBRT2
ASM_SIZE_DIRECTIVE(factor)
ASM_TYPE_DIRECTIVE(two25,@object)
two25: .byte 0, 0, 0, 0x4c
ASM_SIZE_DIRECTIVE(two25)
#ifdef PIC
#define MO(op) op##@GOTOFF(%ebx)
#define MOX(op,x,f) op##@GOTOFF(%ebx,x,f)
#else
#define MO(op) op
#define MOX(op,x,f) op(,x,f)
#endif
.text
ENTRY(__cbrtf)
movl 4(%esp), %eax
xorl %ecx, %ecx
movl %eax, %edx
andl $0x7fffffff, %eax
jz 1f
cmpl $0x7f800000, %eax
jae 1f
#ifdef PIC
pushl %ebx
call 3f
3: popl %ebx
addl $_GLOBAL_OFFSET_TABLE_+[.-3b], %ebx
#endif
cmpl $0x00800000, %eax
jae 2f
#ifdef PIC
flds 8(%esp)
#else
flds 4(%esp)
#endif
fmuls MO(two25)
movl $-25, %ecx
#ifdef PIC
fstps 8(%esp)
movl 8(%esp), %eax
#else
fstps 4(%esp)
movl 4(%esp), %eax
#endif
movl %eax, %edx
andl $0x7fffffff, %eax
2: shrl $23, %eax
andl $0x807fffff, %edx
subl $126, %eax
orl $0x3f000000, %edx
addl %eax, %ecx
#ifdef PIC
movl %edx, 8(%esp)
flds 8(%esp) /* xm */
#else
movl %edx, 4(%esp)
flds 4(%esp) /* xm */
#endif
fabs
/* The following code has two track:
a) compute the normalized cbrt value
b) compute xe/3 and xe%3
The right track computes the value for b) and this is done
in an optimized way by avoiding division. */
fld %st(0) /* xm : xm */
fmull MO(f3) /* f3*xm : xm */
movl $1431655766, %eax
fsubrl MO(f2) /* f2-f3*xm : xm */
imull %ecx
fmul %st(1) /* (f2-f3*xm)*xm : xm */
movl %ecx, %eax
faddl MO(f1) /* u:=f1+(f2-f3*xm)*xm : xm */
sarl $31, %eax
fld %st /* u : u : xm */
subl %eax, %edx
fmul %st(1) /* u*u : u : xm */
fld %st(2) /* xm : u*u : u : xm */
fadd %st /* 2*xm : u*u : u : xm */
fxch %st(1) /* u*u : 2*xm : u : xm */
fmul %st(2) /* t2:=u*u*u : 2*xm : u : xm */
movl %edx, %eax
fadd %st, %st(1) /* t2 : t2+2*xm : u : xm */
leal (%edx,%edx,2),%edx
fadd %st(0) /* 2*t2 : t2+2*xm : u : xm */
subl %edx, %ecx
faddp %st, %st(3) /* t2+2*xm : u : 2*t2+xm */
fmulp /* u*(t2+2*xm) : 2*t2+xm */
fdivp %st, %st(1) /* u*(t2+2*xm)/(2*t2+xm) */
fmull MOX(16+factor,%ecx,8) /* u*(t2+2*xm)/(2*t2+xm)*FACT */
pushl %eax
fildl (%esp) /* xe/3 : u*(t2+2*xm)/(2*t2+xm)*FACT */
fxch /* u*(t2+2*xm)/(2*t2+xm)*FACT : xe/3 */
popl %eax
fscale /* u*(t2+2*xm)/(2*t2+xm)*FACT*2^xe/3 */
fstp %st(1)
#ifdef PIC
popl %ebx
#endif
testl $0x80000000, 4(%esp)
jz 4f
fchs
4: ret
/* Return the argument. */
1: flds 4(%esp)
ret
END(__cbrtf)
weak_alias (__cbrtf, cbrtf)
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