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Diffstat (limited to 'sysdeps/x86_64/fpu/e_powl.S')
| -rw-r--r-- | sysdeps/x86_64/fpu/e_powl.S | 433 |
1 files changed, 0 insertions, 433 deletions
diff --git a/sysdeps/x86_64/fpu/e_powl.S b/sysdeps/x86_64/fpu/e_powl.S deleted file mode 100644 index 571c0a18d5..0000000000 --- a/sysdeps/x86_64/fpu/e_powl.S +++ /dev/null @@ -1,433 +0,0 @@ -/* ix87 specific implementation of pow function. - Copyright (C) 1996-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. - - 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 - <http://www.gnu.org/licenses/>. */ - -#include <machine/asm.h> -#include <x86_64-math-asm.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##(%rip) -#else -# define MO(op) op -#endif - - .text -ENTRY(__ieee754_powl) - fldt 24(%rsp) // y - fxam - - - 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 8(%rsp) // x : y - - 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 31f // x is NaN - - fxch // y : x - - /* fistpll raises invalid exception for |y| >= 1L<<63. */ - fldl MO(p63) // 1L<<63 : y : x - fld %st(1) // y : 1L<<63 : y : x - fabs // |y| : 1L<<63 : y : x - fcomip %st(1), %st // 1L<<63 : y : x - fstp %st(0) // y : x - 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 -8(%rsp) // y : x - fildll -8(%rsp) // int(y) : y : x - fucomip %st(1),%st // y : x - 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). - fldl MO(pm79) // 0x1p-79 : y : x - fld %st(1) // y : 0x1p-79 : y : x - fabs // |y| : 0x1p-79 : y : x - fcomip %st(1), %st // 0x1p-79 : y : x - fstp %st(0) // y : x - 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. */ - fldl MO(p2) // 4 : y : x - fld %st(1) // y : 4 : y : x - fabs // |y| : 4 : y : x - fcomip %st(1), %st // 4 : y : x - fstp %st(0) // y : x - jnc 3f - mov -8(%rsp),%eax - mov -4(%rsp),%edx - 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 - LDBL_CHECK_FORCE_UFLOW_NONNAN - ret - - /* y is ±NAN */ -30: fldt 8(%rsp) // x : y - fldl MO(one) // 1.0 : x : y - fucomip %st(1),%st // x : y - je 32f -31: /* At least one argument NaN, and result should be NaN. */ - faddp - ret -32: jc 31b - /* pow (1, NaN); check if the NaN signaling. */ - testb $0x40, 31(%rsp) - jz 31b - fstp %st(1) - ret - - .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). - fldl MO(p78) // 1L<<78 : y : x - fld %st(1) // y : 1L<<78 : y : x - fabs // |y| : 1L<<78 : y : x - fcomip %st(1), %st // 1L<<78 : y : x - fstp %st(0) // y : x - 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. */ - subq $40, %rsp - cfi_adjust_cfa_offset (40) - fstpt 16(%rsp) // x - fstpt (%rsp) // <empty> - call HIDDEN_JUMPTARGET (__powl_helper) // <result> - addq $40, %rsp - cfi_adjust_cfa_offset (-40) - ret - - // pow(x,±0) = 1, unless x is sNaN - .align ALIGNARG(4) -11: fstp %st(0) // pop y - fldt 8(%rsp) // 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, 15(%rsp) - jnz 111b - fadd %st(0) - ret - - // y == ±inf - .align ALIGNARG(4) -12: fstp %st(0) // pop y - fldl MO(one) // 1 - fldt 8(%rsp) // 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 -#ifdef PIC - lea inf_zero(%rip),%rcx - fldl (%rcx, %rdx, 4) -#else - fldl inf_zero(,%rdx, 4) -#endif - ret - - .align ALIGNARG(4) -14: fldl MO(one) - ret - - .align ALIGNARG(4) -13: fldt 8(%rsp) // load x == NaN - fadd %st(0) - ret - - .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. - fldl MO(p64) // 1L<<64 : y - fld %st(1) // y : 1L<<64 : y - fabs // |y| : 1L<<64 : y - fcomip %st(1), %st // 1L<<64 : y - fstp %st(0) // y - 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 -8(%rsp) // y - fildll -8(%rsp) // int(y) : y - fucomip %st(1),%st - ffreep %st // <empty> - jne 17f - - // OK, the value is an integer, but is it odd? - mov -8(%rsp), %eax - mov -4(%rsp), %edx - andb $1, %al - jz 18f // jump if not odd - // It's an odd integer. - shrl $31, %edx -#ifdef PIC - lea minf_mzero(%rip),%rcx - fldl (%rcx, %rdx, 8) -#else - fldl minf_mzero(,%rdx, 8) -#endif - ret - - .align ALIGNARG(4) -16: fcompl MO(zero) - fnstsw - shrl $5, %eax - andl $8, %eax -#ifdef PIC - lea inf_zero(%rip),%rcx - fldl (%rcx, %rax, 1) -#else - fldl inf_zero(,%rax, 1) -#endif - ret - - .align ALIGNARG(4) -17: shll $30, %edx // sign bit for y in right position -18: shrl $31, %edx -#ifdef PIC - lea inf_zero(%rip),%rcx - fldl (%rcx, %rdx, 8) -#else - fldl inf_zero(,%rdx, 8) -#endif - ret - - .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. - fldl MO(p64) // 1L<<64 : y - fld %st(1) // y : 1L<<64 : y - fabs // |y| : 1L<<64 : y - fcomip %st(1), %st // 1L<<64 : y - fstp %st(0) // y - jnc 25f - fldl MO(p63) // p63 : y - fxch // y : p63 - fprem // y%p63 : p63 - fstp %st(1) // y%p63 - - fld %st // y : y - fistpll -8(%rsp) // y - fildll -8(%rsp) // int(y) : y - fucomip %st(1),%st - ffreep %st // <empty> - jne 26f - - // OK, the value is an integer, but is it odd? - mov -8(%rsp),%eax - mov -4(%rsp),%edx - 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 - -25: fstp %st(0) -26: -27: // Raise divide-by-zero exception and get infinity value. - fldl MO(one) - fdivl MO(zero) - ret - - .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. - fldl MO(p64) // 1L<<64 : y - fxch // y : 1L<<64 - fcomi %st(1), %st // y : 1L<<64 - fstp %st(1) // y - jnc 22f - fldl MO(p63) // p63 : y - fxch // y : p63 - fprem // y%p63 : p63 - fstp %st(1) // y%p63 - - fld %st // y : y - fistpll -8(%rsp) // y - fildll -8(%rsp) // int(y) : y - fucomip %st(1),%st - ffreep %st // <empty> - jne 23f - - // OK, the value is an integer, but is it odd? - mov -8(%rsp),%eax - mov -4(%rsp),%edx - andb $1, %al - jz 24f // jump if not odd - // It's an odd integer. - fldl MO(mzero) - ret - -22: fstp %st(0) -23: -24: fldl MO(zero) - ret - -END(__ieee754_powl) -strong_alias (__ieee754_powl, __powl_finite) |