diff options
Diffstat (limited to 'sysdeps/x86_64/fpu/s_expm1l.S')
| -rw-r--r-- | sysdeps/x86_64/fpu/s_expm1l.S | 87 |
1 files changed, 2 insertions, 85 deletions
diff --git a/sysdeps/x86_64/fpu/s_expm1l.S b/sysdeps/x86_64/fpu/s_expm1l.S index 1380f34f01..7fbd99b0db 100644 --- a/sysdeps/x86_64/fpu/s_expm1l.S +++ b/sysdeps/x86_64/fpu/s_expm1l.S @@ -1,85 +1,2 @@ -/* ix87 specific implementation of exp(x)-1. - Copyright (C) 1996,1997,2001,2002,2008,2009,2012 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. - Based on code by John C. Bowman <bowman@ipp-garching.mpg.de>. - Corrections by H.J. Lu (hjl@gnu.ai.mit.edu), 1997. - - 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/>. */ - - /* Using: e^x - 1 = 2^(x * log2(e)) - 1 */ - -#include <machine/asm.h> - - .section .rodata - - .align ALIGNARG(4) - ASM_TYPE_DIRECTIVE(minus1,@object) -minus1: .double -1.0 - ASM_SIZE_DIRECTIVE(minus1) - ASM_TYPE_DIRECTIVE(one,@object) -one: .double 1.0 - ASM_SIZE_DIRECTIVE(one) - ASM_TYPE_DIRECTIVE(l2e,@object) -l2e: .tfloat 1.442695040888963407359924681002 - ASM_SIZE_DIRECTIVE(l2e) - -#ifdef PIC -#define MO(op) op##(%rip) -#else -#define MO(op) op -#endif - - .text -ENTRY(__expm1l) - movzwl 8+8(%rsp), %eax // load sign bit and 15-bit exponent - xorb $0x80, %ah // invert sign bit (now 1 is "positive") - cmpl $0xc006, %eax // is num positive and exp >= 6 (number is >= 128.0)? - jae __expl // (if num is denormal, it is at least >= 64.0) - - fldt 8(%rsp) // x - fxam // Is NaN or +-Inf? - fstsw %ax - movb $0x45, %ch - andb %ah, %ch - cmpb $0x40, %ch - je 3f // If +-0, jump. - cmpb $0x05, %ch - je 2f // If +-Inf, jump. - - fldt MO(l2e) // log2(e) : x - fmulp // log2(e)*x - fld %st // log2(e)*x : log2(e)*x - frndint // int(log2(e)*x) : log2(e)*x - fsubr %st, %st(1) // int(log2(e)*x) : fract(log2(e)*x) - fxch // fract(log2(e)*x) : int(log2(e)*x) - f2xm1 // 2^fract(log2(e)*x)-1 : int(log2(e)*x) - fscale // 2^(log2(e)*x)-2^int(log2(e)*x) : int(log2(e)*x) - fxch // int(log2(e)*x) : 2^(log2(e)*x)-2^int(log2(e)*x) - fldl MO(one) // 1 : int(log2(e)*x) : 2^(log2(e)*x)-2^int(log2(e)*x) - fscale // 2^int(log2(e)*x) : int(log2(e)*x) : 2^(log2(e)*x)-2^int(log2(e)*x) - fsubrl MO(one) // 1-2^int(log2(e)*x) : int(log2(e)*x) : 2^(log2(e)*x)-2^int(log2(e)*x) - fstp %st(1) // 1-2^int(log2(e)*x) : 2^(log2(e)*x)-2^int(log2(e)*x) - fsubrp %st, %st(1) // 2^(log2(e)*x)-1 - ret - -2: testl $0x200, %eax // Test sign. - jz 3f // If positive, jump. - fstp %st - fldl MO(minus1) // Set result to -1.0. -3: ret -END(__expm1l) -libm_hidden_def (__expm1l) -weak_alias (__expm1l, expm1l) +#define USE_AS_EXPM1L +#include <e_expl.S> |