diff options
Diffstat (limited to 'REORG.TODO/sysdeps/x86_64/fpu/s_fmax.S')
| -rw-r--r-- | REORG.TODO/sysdeps/x86_64/fpu/s_fmax.S | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/x86_64/fpu/s_fmax.S b/REORG.TODO/sysdeps/x86_64/fpu/s_fmax.S new file mode 100644 index 0000000000..f93c9f9371 --- /dev/null +++ b/REORG.TODO/sysdeps/x86_64/fpu/s_fmax.S @@ -0,0 +1,52 @@ +/* Compute maximum of two numbers, regarding NaN as missing argument. + Copyright (C) 2002-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Jaeger <aj@suse.de>, 2002. + + 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> + + .text +ENTRY(__fmax) + ucomisd %xmm0, %xmm1 + jp 1f // jump if unordered + maxsd %xmm1, %xmm0 + jmp 2f + +1: ucomisd %xmm1, %xmm1 // Is xmm1 a NaN? + jp 3f + // xmm0 is a NaN; xmm1 is not. Test if xmm0 is signaling. + movsd %xmm0, -8(%rsp) + testb $0x8, -2(%rsp) + jz 4f + movsd %xmm1, %xmm0 // otherwise return xmm1 + ret + +3: // xmm1 is a NaN; xmm0 may or may not be. + ucomisd %xmm0, %xmm0 + jp 4f + // xmm1 is a NaN; xmm0 is not. Test if xmm1 is signaling. + movsd %xmm1, -8(%rsp) + testb $0x8, -2(%rsp) + jz 4f + ret + +4: // Both arguments are NaNs, or one is a signaling NaN. + addsd %xmm1, %xmm0 + +2: ret +END(__fmax) +weak_alias (__fmax, fmax) |