mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-12 06:10:10 +00:00
60c414c346
The branch prediction hints is actually hurts performance in this case. The assembly implementation make two assumptions: 1. 'fabs (x) < 2^52' is unlikely and 2. 'x > 0.0' is unlike (if 1. is true). Since it a general floating point function, expected input is not bounded and then it is better to let the hardware handle the branches.
60 lines
1.7 KiB
ArmAsm
60 lines
1.7 KiB
ArmAsm
/* Round float to int floating-point values. PowerPC32 version.
|
|
Copyright (C) 2004-2013 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/>. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
.section .rodata.cst4,"aM",@progbits,4
|
|
.align 2
|
|
.LC0: /* 2**23 */
|
|
.long 0x4b000000
|
|
|
|
.section ".text"
|
|
ENTRY (__rintf)
|
|
#ifdef SHARED
|
|
mflr r11
|
|
cfi_register(lr,r11)
|
|
SETUP_GOT_ACCESS(r9,got_label)
|
|
addis r9,r9,.LC0-got_label@ha
|
|
lfs fp13,.LC0-got_label@l(r9)
|
|
mtlr r11
|
|
cfi_same_value (lr)
|
|
#else
|
|
lis r9,.LC0@ha
|
|
lfs fp13,.LC0@l(r9)
|
|
#endif
|
|
fabs fp0,fp1
|
|
fsubs fp12,fp13,fp13 /* generate 0.0 */
|
|
fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO23) */
|
|
fcmpu cr6,fp1,fp12 /* if (x > 0.0) */
|
|
bnllr cr7
|
|
bng cr6,.L4
|
|
fadds fp1,fp1,fp13 /* x+= TWO23; */
|
|
fsubs fp1,fp1,fp13 /* x-= TWO23; */
|
|
fabs fp1,fp1 /* if (x == 0.0) */
|
|
blr /* x = 0.0; */
|
|
.L4:
|
|
bnllr cr6 /* if (x < 0.0) */
|
|
fsubs fp1,fp1,fp13 /* x-= TWO23; */
|
|
fadds fp1,fp1,fp13 /* x+= TWO23; */
|
|
fnabs fp1,fp1 /* if (x == 0.0) */
|
|
blr /* x = -0.0; */
|
|
END (__rintf)
|
|
|
|
weak_alias (__rintf, rintf)
|
|
|