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/* isnan(). PowerPC32/POWER7 version.
Copyright (C) 2010-2017 Free Software Foundation, Inc.
Contributed by Luis Machado <luisgpm@br.ibm.com>.
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>
#include <math_ldbl_opt.h>
/* int __isnan(x) */
.section .rodata.cst8,"aM",@progbits,8
.align 3
.LC0: /* 1.0 */
.quad 0x3ff0000000000000
.section ".text"
.type __isnan, @function
.machine power7
ENTRY (__isnan)
#ifdef SHARED
mflr r11
cfi_register(lr,r11)
SETUP_GOT_ACCESS(r9,got_label)
addis r9,r9,.LC0-got_label@ha
lfd fp0,.LC0-got_label@l(r9)
mtlr r11
cfi_same_value (lr)
#else
lis r9,.LC0@ha
lfd fp0,.LC0@l(r9)
#endif
ftdiv cr7,fp1,fp0
li r3,0
bflr 30 /* If not NaN or Inf, finish. */
/* We have -INF/+INF/NaN or a denormal. */
stwu r1,-16(r1) /* Allocate stack space. */
stfd fp1,8(r1) /* Transfer FP to GPR's. */
ori 2,2,0 /* Force a new dispatch group. */
lwz r4,8+HIWORD(r1) /* Load the upper half of the FP value. */
lwz r5,8+LOWORD(r1) /* Load the lower half of the FP value. */
addi r1,r1,16 /* Reset the stack pointer. */
lis r0,0x7ff0 /* Load the upper portion for an INF/NaN. */
clrlwi r4,r4,1 /* r4 = abs(r4). */
cmpw cr7,r4,r0 /* if (abs(r4) <= inf). */
cmpwi cr6,r5,0 /* r5 == 0x00000000? */
bltlr cr7 /* LT means we have a denormal. */
bgt cr7,L(NaN) /* GT means we have a NaN. */
beqlr cr6 /* EQ means we have +/-INF. */
L(NaN):
li r3,1 /* x == NaN? */
blr
END (__isnan)
hidden_def (__isnan)
weak_alias (__isnan, isnan)
/* It turns out that the 'double' version will also always work for
single-precision. */
strong_alias (__isnan, __isnanf)
hidden_def (__isnanf)
weak_alias (__isnanf, isnanf)
#ifdef NO_LONG_DOUBLE
strong_alias (__isnan, __isnanl)
weak_alias (__isnan, isnanl)
#endif
#if !IS_IN (libm)
# if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
compat_symbol (libc, isnan, isnanl, GLIBC_2_0);
# endif
#endif
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