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i386: Replace assembly versions of e_powf with generic e_powf.c
This patch replaces i386 assembly versions of e_powf with generic
e_powf.c. For workload-spec2017.wrf, on Nehalem, it improves
performance by:
Before After Improvement
reciprocal-throughput 230.855 78.3358 194%
latency 231.685 94.1259 146%
On Skylake, it improves performance by:
Before After Improvement
reciprocal-throughput 239.858 47.4713 405%
latency 247.57 93.8798 163%
On IvyBridge with --disable-multi-arch, it improves performance by:
Before After Improvement
reciprocal-throughput 269.078 63.3758 324%
latency 271.473 102.091 165%
* sysdeps/i386/fpu/e_powf.S: Removed.
* sysdeps/i386/fpu/e_powf_log2_data.c: Likewise.
* sysdeps/i386/fpu/w_powf.c: Likewise.
* sysdeps/i386/fpu/libm-test-ulps: Updated for generic e_powf.c.
* sysdeps/i386/i686/fpu/multiarch/libm-test-ulps: Likewise.
* sysdeps/i386/i686/fpu/multiarch/Makefile (libm-sysdep_routines):
Add e_powf-sse2.
(CFLAGS-e_powf-sse2.c): New.
* sysdeps/i386/i686/fpu/multiarch/e_powf-sse2.c: New file.
* sysdeps/i386/i686/fpu/multiarch/e_powf.c: Likewise.
This commit is contained in:
H.J. Lu
parent
6089a3ee24
commit
5313581cb5
13
ChangeLog
13
ChangeLog
@ -1,3 +1,16 @@
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2017-10-22 H.J. Lu <hongjiu.lu@intel.com>
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* sysdeps/i386/fpu/e_powf.S: Removed.
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* sysdeps/i386/fpu/e_powf_log2_data.c: Likewise.
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* sysdeps/i386/fpu/w_powf.c: Likewise.
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* sysdeps/i386/fpu/libm-test-ulps: Updated for generic e_powf.c.
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* sysdeps/i386/i686/fpu/multiarch/libm-test-ulps: Likewise.
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* sysdeps/i386/i686/fpu/multiarch/Makefile (libm-sysdep_routines):
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Add e_powf-sse2.
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(CFLAGS-e_powf-sse2.c): New.
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* sysdeps/i386/i686/fpu/multiarch/e_powf-sse2.c: New file.
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* sysdeps/i386/i686/fpu/multiarch/e_powf.c: Likewise.
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2017-10-22 H.J. Lu <hongjiu.lu@intel.com>
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* sysdeps/i386/fpu/e_log2f.S: Removed.
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@ -1,392 +0,0 @@
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/* ix87 specific implementation of pow function.
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Copyright (C) 1996-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <machine/asm.h>
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#include <i386-math-asm.h>
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.section .rodata.cst8,"aM",@progbits,8
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.p2align 3
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.type one,@object
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one: .double 1.0
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ASM_SIZE_DIRECTIVE(one)
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.type limit,@object
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limit: .double 0.29
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ASM_SIZE_DIRECTIVE(limit)
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.type p31,@object
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p31: .byte 0, 0, 0, 0, 0, 0, 0xe0, 0x41
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ASM_SIZE_DIRECTIVE(p31)
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.section .rodata.cst16,"aM",@progbits,16
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.p2align 3
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.type infinity,@object
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inf_zero:
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infinity:
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.byte 0, 0, 0, 0, 0, 0, 0xf0, 0x7f
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ASM_SIZE_DIRECTIVE(infinity)
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.type zero,@object
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zero: .double 0.0
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ASM_SIZE_DIRECTIVE(zero)
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.type minf_mzero,@object
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minf_mzero:
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minfinity:
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.byte 0, 0, 0, 0, 0, 0, 0xf0, 0xff
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mzero:
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.byte 0, 0, 0, 0, 0, 0, 0, 0x80
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ASM_SIZE_DIRECTIVE(minf_mzero)
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DEFINE_FLT_MIN
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#ifdef PIC
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# define MO(op) op##@GOTOFF(%ecx)
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# define MOX(op,x,f) op##@GOTOFF(%ecx,x,f)
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#else
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# define MO(op) op
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# define MOX(op,x,f) op(,x,f)
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#endif
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.text
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ENTRY(__ieee754_powf)
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flds 8(%esp) // y
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fxam
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#ifdef PIC
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LOAD_PIC_REG (cx)
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#endif
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fnstsw
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movb %ah, %dl
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andb $0x45, %ah
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cmpb $0x40, %ah // is y == 0 ?
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je 11f
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cmpb $0x05, %ah // is y == ±inf ?
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je 12f
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cmpb $0x01, %ah // is y == NaN ?
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je 30f
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flds 4(%esp) // x : y
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subl $4, %esp
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cfi_adjust_cfa_offset (4)
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fxam
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fnstsw
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movb %ah, %dh
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andb $0x45, %ah
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cmpb $0x40, %ah
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je 20f // x is ±0
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cmpb $0x05, %ah
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je 15f // x is ±inf
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cmpb $0x01, %ah
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je 33f // x is NaN
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fxch // y : x
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/* fistpl raises invalid exception for |y| >= 1L<<31. */
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fld %st // y : y : x
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fabs // |y| : y : x
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fcompl MO(p31) // y : x
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fnstsw
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sahf
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jnc 2f
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/* First see whether `y' is a natural number. In this case we
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can use a more precise algorithm. */
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fld %st // y : y : x
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fistpl (%esp) // y : x
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fildl (%esp) // int(y) : y : x
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fucomp %st(1) // y : x
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fnstsw
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sahf
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jne 3f
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/* OK, we have an integer value for y. */
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popl %edx
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cfi_adjust_cfa_offset (-4)
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orl $0, %edx
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fstp %st(0) // x
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jns 4f // y >= 0, jump
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fdivrl MO(one) // 1/x (now referred to as x)
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negl %edx
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4: fldl MO(one) // 1 : x
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fxch
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/* If y is even, take the absolute value of x. Otherwise,
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ensure all intermediate values that might overflow have the
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sign of x. */
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testb $1, %dl
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jnz 6f
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fabs
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6: shrl $1, %edx
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jnc 5f
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fxch
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fabs
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fmul %st(1) // x : ST*x
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fxch
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5: fld %st // x : x : ST*x
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fabs // |x| : x : ST*x
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fmulp // |x|*x : ST*x
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testl %edx, %edx
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jnz 6b
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fstp %st(0) // ST*x
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FLT_NARROW_EVAL_UFLOW_NONNAN
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ret
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/* y is ±NAN */
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30: flds 4(%esp) // x : y
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fldl MO(one) // 1.0 : x : y
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fucomp %st(1) // x : y
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fnstsw
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sahf
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je 31f
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fxch // y : x
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31: fstp %st(1)
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ret
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cfi_adjust_cfa_offset (4)
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.align ALIGNARG(4)
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2: /* y is a large integer (so even). */
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fxch // x : y
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fabs // |x| : y
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fxch // y : x
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.align ALIGNARG(4)
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3: /* y is a real number. */
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fxch // x : y
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fldl MO(one) // 1.0 : x : y
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fldl MO(limit) // 0.29 : 1.0 : x : y
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fld %st(2) // x : 0.29 : 1.0 : x : y
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fsub %st(2) // x-1 : 0.29 : 1.0 : x : y
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fabs // |x-1| : 0.29 : 1.0 : x : y
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fucompp // 1.0 : x : y
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fnstsw
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fxch // x : 1.0 : y
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sahf
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ja 7f
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fsub %st(1) // x-1 : 1.0 : y
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fyl2xp1 // log2(x) : y
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jmp 8f
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7: fyl2x // log2(x) : y
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8: fmul %st(1) // y*log2(x) : y
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fst %st(1) // y*log2(x) : y*log2(x)
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frndint // int(y*log2(x)) : y*log2(x)
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fsubr %st, %st(1) // int(y*log2(x)) : fract(y*log2(x))
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fxch // fract(y*log2(x)) : int(y*log2(x))
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f2xm1 // 2^fract(y*log2(x))-1 : int(y*log2(x))
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faddl MO(one) // 2^fract(y*log2(x)) : int(y*log2(x))
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fscale // 2^fract(y*log2(x))*2^int(y*log2(x)) : int(y*log2(x))
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32: addl $4, %esp
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cfi_adjust_cfa_offset (-4)
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fstp %st(1) // 2^fract(y*log2(x))*2^int(y*log2(x))
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FLT_NARROW_EVAL_UFLOW_NONNAN
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ret
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/* x is NaN. */
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cfi_adjust_cfa_offset (4)
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33: addl $4, %esp
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cfi_adjust_cfa_offset (-4)
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fstp %st(1)
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ret
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// pow(x,±0) = 1
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.align ALIGNARG(4)
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11: fstp %st(0) // pop y
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fldl MO(one)
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ret
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// y == ±inf
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.align ALIGNARG(4)
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12: fstp %st(0) // pop y
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fldl MO(one) // 1
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flds 4(%esp) // x : 1
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fabs // abs(x) : 1
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fucompp // < 1, == 1, or > 1
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fnstsw
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andb $0x45, %ah
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cmpb $0x45, %ah
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je 13f // jump if x is NaN
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cmpb $0x40, %ah
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je 14f // jump if |x| == 1
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shlb $1, %ah
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xorb %ah, %dl
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andl $2, %edx
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fldl MOX(inf_zero, %edx, 4)
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ret
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.align ALIGNARG(4)
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14: fldl MO(one)
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ret
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.align ALIGNARG(4)
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13: flds 4(%esp) // load x == NaN
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ret
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cfi_adjust_cfa_offset (4)
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.align ALIGNARG(4)
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// x is ±inf
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15: fstp %st(0) // y
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testb $2, %dh
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jz 16f // jump if x == +inf
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// fistpl raises invalid exception for |y| >= 1L<<31, so test
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// that (in which case y is certainly even) before testing
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// whether y is odd.
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fld %st // y : y
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fabs // |y| : y
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fcompl MO(p31) // y
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fnstsw
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sahf
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jnc 16f
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// We must find out whether y is an odd integer.
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fld %st // y : y
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fistpl (%esp) // y
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fildl (%esp) // int(y) : y
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fucompp // <empty>
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fnstsw
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sahf
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jne 17f
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// OK, the value is an integer.
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popl %edx
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cfi_adjust_cfa_offset (-4)
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testb $1, %dl
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jz 18f // jump if not odd
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// It's an odd integer.
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shrl $31, %edx
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fldl MOX(minf_mzero, %edx, 8)
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ret
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cfi_adjust_cfa_offset (4)
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.align ALIGNARG(4)
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16: fcompl MO(zero)
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addl $4, %esp
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cfi_adjust_cfa_offset (-4)
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fnstsw
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shrl $5, %eax
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andl $8, %eax
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fldl MOX(inf_zero, %eax, 1)
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ret
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cfi_adjust_cfa_offset (4)
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.align ALIGNARG(4)
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17: shll $30, %edx // sign bit for y in right position
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addl $4, %esp
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cfi_adjust_cfa_offset (-4)
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18: shrl $31, %edx
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fldl MOX(inf_zero, %edx, 8)
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ret
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cfi_adjust_cfa_offset (4)
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.align ALIGNARG(4)
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// x is ±0
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20: fstp %st(0) // y
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testb $2, %dl
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jz 21f // y > 0
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// x is ±0 and y is < 0. We must find out whether y is an odd integer.
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testb $2, %dh
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jz 25f
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// fistpl raises invalid exception for |y| >= 1L<<31, so test
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// that (in which case y is certainly even) before testing
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// whether y is odd.
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fld %st // y : y
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fabs // |y| : y
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fcompl MO(p31) // y
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fnstsw
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sahf
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jnc 25f
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fld %st // y : y
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fistpl (%esp) // y
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fildl (%esp) // int(y) : y
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fucompp // <empty>
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fnstsw
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sahf
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jne 26f
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// OK, the value is an integer.
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popl %edx
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cfi_adjust_cfa_offset (-4)
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testb $1, %dl
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jz 27f // jump if not odd
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// It's an odd integer.
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// Raise divide-by-zero exception and get minus infinity value.
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fldl MO(one)
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fdivl MO(zero)
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fchs
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ret
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cfi_adjust_cfa_offset (4)
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25: fstp %st(0)
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26: addl $4, %esp
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cfi_adjust_cfa_offset (-4)
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27: // Raise divide-by-zero exception and get infinity value.
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fldl MO(one)
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fdivl MO(zero)
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ret
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cfi_adjust_cfa_offset (4)
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.align ALIGNARG(4)
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// x is ±0 and y is > 0. We must find out whether y is an odd integer.
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21: testb $2, %dh
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jz 22f
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// fistpl raises invalid exception for |y| >= 1L<<31, so test
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// that (in which case y is certainly even) before testing
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// whether y is odd.
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fcoml MO(p31) // y
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fnstsw
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sahf
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jnc 22f
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fld %st // y : y
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fistpl (%esp) // y
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fildl (%esp) // int(y) : y
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fucompp // <empty>
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fnstsw
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sahf
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jne 23f
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// OK, the value is an integer.
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popl %edx
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cfi_adjust_cfa_offset (-4)
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testb $1, %dl
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jz 24f // jump if not odd
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// It's an odd integer.
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fldl MO(mzero)
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ret
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cfi_adjust_cfa_offset (4)
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22: fstp %st(0)
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23: addl $4, %esp // Don't use pop.
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cfi_adjust_cfa_offset (-4)
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24: fldl MO(zero)
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ret
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END(__ieee754_powf)
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strong_alias (__ieee754_powf, __powf_finite)
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@ -1 +0,0 @@
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/* Not needed. */
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@ -2370,24 +2370,30 @@ ldouble: 1
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Function: "pow_downward":
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double: 1
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float: 1
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float128: 2
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idouble: 1
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ifloat: 1
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ifloat128: 2
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ildouble: 4
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ldouble: 4
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Function: "pow_towardzero":
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double: 1
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float: 1
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float128: 2
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idouble: 1
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ifloat: 1
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ifloat128: 2
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ildouble: 4
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ldouble: 4
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Function: "pow_upward":
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double: 1
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float: 1
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float128: 2
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idouble: 1
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ifloat: 1
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ifloat128: 2
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ildouble: 4
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ldouble: 4
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@ -1 +0,0 @@
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#include <sysdeps/../math/w_powf.c>
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@ -1,9 +1,10 @@
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ifeq ($(subdir),math)
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libm-sysdep_routines += e_exp2f-sse2 e_expf-sse2 e_logf-sse2 e_log2f-sse2 \
|
||||
s_sinf-sse2 s_cosf-sse2 s_sincosf-sse2
|
||||
e_powf-sse2 s_sinf-sse2 s_cosf-sse2 s_sincosf-sse2
|
||||
|
||||
CFLAGS-e_exp2f-sse2.c = -msse2 -mfpmath=sse
|
||||
CFLAGS-e_expf-sse2.c = -msse2 -mfpmath=sse
|
||||
CFLAGS-e_log2f-sse2.c = -msse2 -mfpmath=sse
|
||||
CFLAGS-e_logf-sse2.c = -msse2 -mfpmath=sse
|
||||
CFLAGS-e_powf-sse2.c = -msse2 -mfpmath=sse
|
||||
endif
|
||||
|
||||
3
sysdeps/i386/i686/fpu/multiarch/e_powf-sse2.c
Normal file
3
sysdeps/i386/i686/fpu/multiarch/e_powf-sse2.c
Normal file
@ -0,0 +1,3 @@
|
||||
#define __powf __powf_sse2
|
||||
|
||||
#include <sysdeps/ieee754/flt-32/e_powf.c>
|
||||
43
sysdeps/i386/i686/fpu/multiarch/e_powf.c
Normal file
43
sysdeps/i386/i686/fpu/multiarch/e_powf.c
Normal file
@ -0,0 +1,43 @@
|
||||
/* Multiple versions of powf.
|
||||
Copyright (C) 2017 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
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#define powf __redirect_powf
|
||||
#define __DECL_SIMD___redirect_powf
|
||||
#include <math.h>
|
||||
#undef powf
|
||||
|
||||
#define SYMBOL_NAME powf
|
||||
#include "ifunc-sse2.h"
|
||||
|
||||
libc_ifunc_redirected (__redirect_powf, __powf, IFUNC_SELECTOR ());
|
||||
|
||||
#ifdef SHARED
|
||||
__hidden_ver1 (__powf_ia32, __GI___powf, __redirect_powf)
|
||||
__attribute__ ((visibility ("hidden")));
|
||||
|
||||
# include <shlib-compat.h>
|
||||
versioned_symbol (libm, __powf, powf, GLIBC_2_27);
|
||||
#else
|
||||
weak_alias (__powf, powf)
|
||||
#endif
|
||||
|
||||
strong_alias (__powf, __ieee754_powf)
|
||||
strong_alias (__powf, __powf_finite)
|
||||
|
||||
#define __powf __powf_ia32
|
||||
#include <sysdeps/ieee754/flt-32/e_powf.c>
|
||||
@ -2370,24 +2370,30 @@ ldouble: 1
|
||||
|
||||
Function: "pow_downward":
|
||||
double: 1
|
||||
float: 1
|
||||
float128: 2
|
||||
idouble: 1
|
||||
ifloat: 1
|
||||
ifloat128: 2
|
||||
ildouble: 4
|
||||
ldouble: 4
|
||||
|
||||
Function: "pow_towardzero":
|
||||
double: 1
|
||||
float: 1
|
||||
float128: 2
|
||||
idouble: 1
|
||||
ifloat: 1
|
||||
ifloat128: 2
|
||||
ildouble: 4
|
||||
ldouble: 4
|
||||
|
||||
Function: "pow_upward":
|
||||
double: 1
|
||||
float: 1
|
||||
float128: 2
|
||||
idouble: 1
|
||||
ifloat: 1
|
||||
ifloat128: 2
|
||||
ildouble: 4
|
||||
ldouble: 4
|
||||
@ -2577,30 +2583,30 @@ ldouble: 5
|
||||
|
||||
Function: "tgamma_downward":
|
||||
double: 3
|
||||
float: 4
|
||||
float: 5
|
||||
float128: 5
|
||||
idouble: 3
|
||||
ifloat: 4
|
||||
ifloat: 5
|
||||
ifloat128: 5
|
||||
ildouble: 5
|
||||
ldouble: 5
|
||||
|
||||
Function: "tgamma_towardzero":
|
||||
double: 4
|
||||
float: 4
|
||||
float: 5
|
||||
float128: 5
|
||||
idouble: 4
|
||||
ifloat: 4
|
||||
ifloat: 5
|
||||
ifloat128: 5
|
||||
ildouble: 5
|
||||
ldouble: 5
|
||||
|
||||
Function: "tgamma_upward":
|
||||
double: 4
|
||||
float: 4
|
||||
float: 6
|
||||
float128: 4
|
||||
idouble: 4
|
||||
ifloat: 4
|
||||
ifloat: 6
|
||||
ifloat128: 4
|
||||
ildouble: 5
|
||||
ldouble: 5
|
||||
|
||||
Loading…
Reference in New Issue
Block a user