| /* isnan(). PowerPC32/POWER7 version. |
| Copyright (C) 2010 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #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) |
| |
| bcl 20,31,1f |
| 1: mflr r9 |
| addis r9,r9,.LC0-1b@ha |
| lfd fp0,.LC0-1b@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(r1) /* Load the upper half of the FP value. */ |
| lwz r5,12(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 |
| |
| #ifndef 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 |
