mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-11 05:40:06 +00:00
581c785bf3
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
460 lines
9.2 KiB
ArmAsm
460 lines
9.2 KiB
ArmAsm
/* ix87 specific implementation of pow function.
|
|
Copyright (C) 1996-2022 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <machine/asm.h>
|
|
#include <i386-math-asm.h>
|
|
#include <libm-alias-finite.h>
|
|
|
|
.section .rodata.cst8,"aM",@progbits,8
|
|
|
|
.p2align 3
|
|
.type one,@object
|
|
one: .double 1.0
|
|
ASM_SIZE_DIRECTIVE(one)
|
|
.type p2,@object
|
|
p2: .byte 0, 0, 0, 0, 0, 0, 0x10, 0x40
|
|
ASM_SIZE_DIRECTIVE(p2)
|
|
.type p63,@object
|
|
p63: .byte 0, 0, 0, 0, 0, 0, 0xe0, 0x43
|
|
ASM_SIZE_DIRECTIVE(p63)
|
|
.type p64,@object
|
|
p64: .byte 0, 0, 0, 0, 0, 0, 0xf0, 0x43
|
|
ASM_SIZE_DIRECTIVE(p64)
|
|
.type p78,@object
|
|
p78: .byte 0, 0, 0, 0, 0, 0, 0xd0, 0x44
|
|
ASM_SIZE_DIRECTIVE(p78)
|
|
.type pm79,@object
|
|
pm79: .byte 0, 0, 0, 0, 0, 0, 0, 0x3b
|
|
ASM_SIZE_DIRECTIVE(pm79)
|
|
|
|
.section .rodata.cst16,"aM",@progbits,16
|
|
|
|
.p2align 3
|
|
.type infinity,@object
|
|
inf_zero:
|
|
infinity:
|
|
.byte 0, 0, 0, 0, 0, 0, 0xf0, 0x7f
|
|
ASM_SIZE_DIRECTIVE(infinity)
|
|
.type zero,@object
|
|
zero: .double 0.0
|
|
ASM_SIZE_DIRECTIVE(zero)
|
|
.type minf_mzero,@object
|
|
minf_mzero:
|
|
minfinity:
|
|
.byte 0, 0, 0, 0, 0, 0, 0xf0, 0xff
|
|
mzero:
|
|
.byte 0, 0, 0, 0, 0, 0, 0, 0x80
|
|
ASM_SIZE_DIRECTIVE(minf_mzero)
|
|
DEFINE_LDBL_MIN
|
|
|
|
#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_powl)
|
|
fldt 16(%esp) // y
|
|
fxam
|
|
|
|
#ifdef PIC
|
|
LOAD_PIC_REG (cx)
|
|
#endif
|
|
|
|
fnstsw
|
|
movb %ah, %dl
|
|
andb $0x45, %ah
|
|
cmpb $0x40, %ah // is y == 0 ?
|
|
je 11f
|
|
|
|
cmpb $0x05, %ah // is y == ±inf ?
|
|
je 12f
|
|
|
|
cmpb $0x01, %ah // is y == NaN ?
|
|
je 30f
|
|
|
|
fldt 4(%esp) // x : y
|
|
|
|
subl $8,%esp
|
|
cfi_adjust_cfa_offset (8)
|
|
|
|
fxam
|
|
fnstsw
|
|
movb %ah, %dh
|
|
andb $0x45, %ah
|
|
cmpb $0x40, %ah
|
|
je 20f // x is ±0
|
|
|
|
cmpb $0x05, %ah
|
|
je 15f // x is ±inf
|
|
|
|
cmpb $0x01, %ah
|
|
je 32f // x is NaN
|
|
|
|
fxch // y : x
|
|
|
|
/* fistpll raises invalid exception for |y| >= 1L<<63. */
|
|
fld %st // y : y : x
|
|
fabs // |y| : y : x
|
|
fcompl MO(p63) // y : x
|
|
fnstsw
|
|
sahf
|
|
jnc 2f
|
|
|
|
/* First see whether `y' is a natural number. In this case we
|
|
can use a more precise algorithm. */
|
|
fld %st // y : y : x
|
|
fistpll (%esp) // y : x
|
|
fildll (%esp) // int(y) : y : x
|
|
fucomp %st(1) // y : x
|
|
fnstsw
|
|
sahf
|
|
je 9f
|
|
|
|
// If y has absolute value at most 0x1p-79, then any finite
|
|
// nonzero x will result in 1. Saturate y to those bounds to
|
|
// avoid underflow in the calculation of y*log2(x).
|
|
fld %st // y : y : x
|
|
fabs // |y| : y : x
|
|
fcompl MO(pm79) // y : x
|
|
fnstsw
|
|
sahf
|
|
jnc 3f
|
|
fstp %st(0) // pop y
|
|
fldl MO(pm79) // 0x1p-79 : x
|
|
testb $2, %dl
|
|
jnz 3f // y > 0
|
|
fchs // -0x1p-79 : x
|
|
jmp 3f
|
|
|
|
9: /* OK, we have an integer value for y. Unless very small
|
|
(we use < 4), use the algorithm for real exponent to avoid
|
|
accumulation of errors. */
|
|
fld %st // y : y : x
|
|
fabs // |y| : y : x
|
|
fcompl MO(p2) // y : x
|
|
fnstsw
|
|
sahf
|
|
jnc 3f
|
|
popl %eax
|
|
cfi_adjust_cfa_offset (-4)
|
|
popl %edx
|
|
cfi_adjust_cfa_offset (-4)
|
|
orl $0, %edx
|
|
fstp %st(0) // x
|
|
jns 4f // y >= 0, jump
|
|
fdivrl MO(one) // 1/x (now referred to as x)
|
|
negl %eax
|
|
adcl $0, %edx
|
|
negl %edx
|
|
4: fldl MO(one) // 1 : x
|
|
fxch
|
|
|
|
/* If y is even, take the absolute value of x. Otherwise,
|
|
ensure all intermediate values that might overflow have the
|
|
sign of x. */
|
|
testb $1, %al
|
|
jnz 6f
|
|
fabs
|
|
|
|
6: shrdl $1, %edx, %eax
|
|
jnc 5f
|
|
fxch
|
|
fabs
|
|
fmul %st(1) // x : ST*x
|
|
fxch
|
|
5: fld %st // x : x : ST*x
|
|
fabs // |x| : x : ST*x
|
|
fmulp // |x|*x : ST*x
|
|
shrl $1, %edx
|
|
movl %eax, %ecx
|
|
orl %edx, %ecx
|
|
jnz 6b
|
|
fstp %st(0) // ST*x
|
|
#ifdef PIC
|
|
LOAD_PIC_REG (cx)
|
|
#endif
|
|
LDBL_CHECK_FORCE_UFLOW_NONNAN
|
|
ret
|
|
|
|
/* y is ±NAN */
|
|
30: fldt 4(%esp) // x : y
|
|
fldl MO(one) // 1.0 : x : y
|
|
fucomp %st(1) // x : y
|
|
fnstsw
|
|
sahf
|
|
je 33f
|
|
31: /* At least one argument NaN, and result should be NaN. */
|
|
faddp
|
|
ret
|
|
33: jp 31b
|
|
/* pow (1, NaN); check if the NaN signaling. */
|
|
testb $0x40, 23(%esp)
|
|
jz 31b
|
|
fstp %st(1)
|
|
ret
|
|
|
|
cfi_adjust_cfa_offset (8)
|
|
32: addl $8, %esp
|
|
cfi_adjust_cfa_offset (-8)
|
|
faddp
|
|
ret
|
|
|
|
cfi_adjust_cfa_offset (8)
|
|
.align ALIGNARG(4)
|
|
2: // y is a large integer (absolute value at least 1L<<63).
|
|
// If y has absolute value at least 1L<<78, then any finite
|
|
// nonzero x will result in 0 (underflow), 1 or infinity (overflow).
|
|
// Saturate y to those bounds to avoid overflow in the calculation
|
|
// of y*log2(x).
|
|
fld %st // y : y : x
|
|
fabs // |y| : y : x
|
|
fcompl MO(p78) // y : x
|
|
fnstsw
|
|
sahf
|
|
jc 3f
|
|
fstp %st(0) // pop y
|
|
fldl MO(p78) // 1L<<78 : x
|
|
testb $2, %dl
|
|
jz 3f // y > 0
|
|
fchs // -(1L<<78) : x
|
|
.align ALIGNARG(4)
|
|
3: /* y is a real number. */
|
|
subl $28, %esp
|
|
cfi_adjust_cfa_offset (28)
|
|
fstpt 12(%esp) // x
|
|
fstpt (%esp) // <empty>
|
|
call HIDDEN_JUMPTARGET (__powl_helper) // <result>
|
|
addl $36, %esp
|
|
cfi_adjust_cfa_offset (-36)
|
|
ret
|
|
|
|
// pow(x,±0) = 1, unless x is sNaN
|
|
.align ALIGNARG(4)
|
|
11: fstp %st(0) // pop y
|
|
fldt 4(%esp) // x
|
|
fxam
|
|
fnstsw
|
|
andb $0x45, %ah
|
|
cmpb $0x01, %ah
|
|
je 112f // x is NaN
|
|
111: fstp %st(0)
|
|
fldl MO(one)
|
|
ret
|
|
|
|
112: testb $0x40, 11(%esp)
|
|
jnz 111b
|
|
fadd %st(0)
|
|
ret
|
|
|
|
// y == ±inf
|
|
.align ALIGNARG(4)
|
|
12: fstp %st(0) // pop y
|
|
fldl MO(one) // 1
|
|
fldt 4(%esp) // x : 1
|
|
fabs // abs(x) : 1
|
|
fucompp // < 1, == 1, or > 1
|
|
fnstsw
|
|
andb $0x45, %ah
|
|
cmpb $0x45, %ah
|
|
je 13f // jump if x is NaN
|
|
|
|
cmpb $0x40, %ah
|
|
je 14f // jump if |x| == 1
|
|
|
|
shlb $1, %ah
|
|
xorb %ah, %dl
|
|
andl $2, %edx
|
|
fldl MOX(inf_zero, %edx, 4)
|
|
ret
|
|
|
|
.align ALIGNARG(4)
|
|
14: fldl MO(one)
|
|
ret
|
|
|
|
.align ALIGNARG(4)
|
|
13: fldt 4(%esp) // load x == NaN
|
|
fadd %st(0)
|
|
ret
|
|
|
|
cfi_adjust_cfa_offset (8)
|
|
.align ALIGNARG(4)
|
|
// x is ±inf
|
|
15: fstp %st(0) // y
|
|
testb $2, %dh
|
|
jz 16f // jump if x == +inf
|
|
|
|
// fistpll raises invalid exception for |y| >= 1L<<63, but y
|
|
// may be odd unless we know |y| >= 1L<<64.
|
|
fld %st // y : y
|
|
fabs // |y| : y
|
|
fcompl MO(p64) // y
|
|
fnstsw
|
|
sahf
|
|
jnc 16f
|
|
fldl MO(p63) // p63 : y
|
|
fxch // y : p63
|
|
fprem // y%p63 : p63
|
|
fstp %st(1) // y%p63
|
|
|
|
// We must find out whether y is an odd integer.
|
|
fld %st // y : y
|
|
fistpll (%esp) // y
|
|
fildll (%esp) // int(y) : y
|
|
fucompp // <empty>
|
|
fnstsw
|
|
sahf
|
|
jne 17f
|
|
|
|
// OK, the value is an integer, but is it odd?
|
|
popl %eax
|
|
cfi_adjust_cfa_offset (-4)
|
|
popl %edx
|
|
cfi_adjust_cfa_offset (-4)
|
|
andb $1, %al
|
|
jz 18f // jump if not odd
|
|
// It's an odd integer.
|
|
shrl $31, %edx
|
|
fldl MOX(minf_mzero, %edx, 8)
|
|
ret
|
|
|
|
cfi_adjust_cfa_offset (8)
|
|
.align ALIGNARG(4)
|
|
16: fcompl MO(zero)
|
|
addl $8, %esp
|
|
cfi_adjust_cfa_offset (-8)
|
|
fnstsw
|
|
shrl $5, %eax
|
|
andl $8, %eax
|
|
fldl MOX(inf_zero, %eax, 1)
|
|
ret
|
|
|
|
cfi_adjust_cfa_offset (8)
|
|
.align ALIGNARG(4)
|
|
17: shll $30, %edx // sign bit for y in right position
|
|
addl $8, %esp
|
|
cfi_adjust_cfa_offset (-8)
|
|
18: shrl $31, %edx
|
|
fldl MOX(inf_zero, %edx, 8)
|
|
ret
|
|
|
|
cfi_adjust_cfa_offset (8)
|
|
.align ALIGNARG(4)
|
|
// x is ±0
|
|
20: fstp %st(0) // y
|
|
testb $2, %dl
|
|
jz 21f // y > 0
|
|
|
|
// x is ±0 and y is < 0. We must find out whether y is an odd integer.
|
|
testb $2, %dh
|
|
jz 25f
|
|
|
|
// fistpll raises invalid exception for |y| >= 1L<<63, but y
|
|
// may be odd unless we know |y| >= 1L<<64.
|
|
fld %st // y : y
|
|
fabs // |y| : y
|
|
fcompl MO(p64) // y
|
|
fnstsw
|
|
sahf
|
|
jnc 25f
|
|
fldl MO(p63) // p63 : y
|
|
fxch // y : p63
|
|
fprem // y%p63 : p63
|
|
fstp %st(1) // y%p63
|
|
|
|
fld %st // y : y
|
|
fistpll (%esp) // y
|
|
fildll (%esp) // int(y) : y
|
|
fucompp // <empty>
|
|
fnstsw
|
|
sahf
|
|
jne 26f
|
|
|
|
// OK, the value is an integer, but is it odd?
|
|
popl %eax
|
|
cfi_adjust_cfa_offset (-4)
|
|
popl %edx
|
|
cfi_adjust_cfa_offset (-4)
|
|
andb $1, %al
|
|
jz 27f // jump if not odd
|
|
// It's an odd integer.
|
|
// Raise divide-by-zero exception and get minus infinity value.
|
|
fldl MO(one)
|
|
fdivl MO(zero)
|
|
fchs
|
|
ret
|
|
|
|
cfi_adjust_cfa_offset (8)
|
|
25: fstp %st(0)
|
|
26: addl $8, %esp
|
|
cfi_adjust_cfa_offset (-8)
|
|
27: // Raise divide-by-zero exception and get infinity value.
|
|
fldl MO(one)
|
|
fdivl MO(zero)
|
|
ret
|
|
|
|
cfi_adjust_cfa_offset (8)
|
|
.align ALIGNARG(4)
|
|
// x is ±0 and y is > 0. We must find out whether y is an odd integer.
|
|
21: testb $2, %dh
|
|
jz 22f
|
|
|
|
// fistpll raises invalid exception for |y| >= 1L<<63, but y
|
|
// may be odd unless we know |y| >= 1L<<64.
|
|
fld %st // y : y
|
|
fcompl MO(p64) // y
|
|
fnstsw
|
|
sahf
|
|
jnc 22f
|
|
fldl MO(p63) // p63 : y
|
|
fxch // y : p63
|
|
fprem // y%p63 : p63
|
|
fstp %st(1) // y%p63
|
|
|
|
fld %st // y : y
|
|
fistpll (%esp) // y
|
|
fildll (%esp) // int(y) : y
|
|
fucompp // <empty>
|
|
fnstsw
|
|
sahf
|
|
jne 23f
|
|
|
|
// OK, the value is an integer, but is it odd?
|
|
popl %eax
|
|
cfi_adjust_cfa_offset (-4)
|
|
popl %edx
|
|
cfi_adjust_cfa_offset (-4)
|
|
andb $1, %al
|
|
jz 24f // jump if not odd
|
|
// It's an odd integer.
|
|
fldl MO(mzero)
|
|
ret
|
|
|
|
cfi_adjust_cfa_offset (8)
|
|
22: fstp %st(0)
|
|
23: addl $8, %esp // Don't use 2 x pop
|
|
cfi_adjust_cfa_offset (-8)
|
|
24: fldl MO(zero)
|
|
ret
|
|
|
|
END(__ieee754_powl)
|
|
libm_alias_finite (__ieee754_powl, __powl)
|