diff options
Diffstat (limited to 'REORG.TODO/sysdeps/i386/fpu/s_frexp.S')
| -rw-r--r-- | REORG.TODO/sysdeps/i386/fpu/s_frexp.S | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/i386/fpu/s_frexp.S b/REORG.TODO/sysdeps/i386/fpu/s_frexp.S new file mode 100644 index 0000000000..104f733bf6 --- /dev/null +++ b/REORG.TODO/sysdeps/i386/fpu/s_frexp.S @@ -0,0 +1,83 @@ +/* ix87 specific frexp implementation for double. + Copyright (C) 1997-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + 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 <machine/asm.h> + + .section .rodata + + .align ALIGNARG(4) + .type two54,@object +two54: .byte 0, 0, 0, 0, 0, 0, 0x50, 0x43 + ASM_SIZE_DIRECTIVE(two54) + +#ifdef PIC +#define MO(op) op##@GOTOFF(%edx) +#else +#define MO(op) op +#endif + +#define PARMS 4 /* no space for saved regs */ +#define VAL0 PARMS +#define VAL1 VAL0+4 +#define EXPP VAL1+4 + + .text +ENTRY (__frexp) + + movl VAL0(%esp), %ecx + movl VAL1(%esp), %eax + movl %eax, %edx + andl $0x7fffffff, %eax + orl %eax, %ecx + jz 1f + xorl %ecx, %ecx + cmpl $0x7ff00000, %eax + jae 1f + + cmpl $0x00100000, %eax + jae 2f + + fldl VAL0(%esp) +#ifdef PIC + LOAD_PIC_REG (dx) +#endif + fmull MO(two54) + movl $-54, %ecx + fstpl VAL0(%esp) + fwait + movl VAL1(%esp), %eax + movl %eax, %edx + andl $0x7fffffff, %eax + +2: shrl $20, %eax + andl $0x800fffff, %edx + subl $1022, %eax + orl $0x3fe00000, %edx + addl %eax, %ecx + movl %edx, VAL1(%esp) + + /* Store %ecx in the variable pointed to by the second argument, + get the factor from the stack and return. */ +1: movl EXPP(%esp), %eax + fldl VAL0(%esp) + movl %ecx, (%eax) + + ret +END (__frexp) +weak_alias (__frexp, frexp) |