diff options
Diffstat (limited to 'libc/sysdeps/i386/fpu/s_expm1.S')
| -rw-r--r-- | libc/sysdeps/i386/fpu/s_expm1.S | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/libc/sysdeps/i386/fpu/s_expm1.S b/libc/sysdeps/i386/fpu/s_expm1.S index 91617eb74..36f8214c0 100644 --- a/libc/sysdeps/i386/fpu/s_expm1.S +++ b/libc/sysdeps/i386/fpu/s_expm1.S @@ -1,5 +1,5 @@ /* ix87 specific implementation of exp(x)-1. - Copyright (C) 1996-2013 Free Software Foundation, Inc. + Copyright (C) 1996-2014 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. Based on code by John C. Bowman <bowman@ipp-garching.mpg.de>. @@ -78,7 +78,18 @@ ENTRY(__expm1) 5: fldt MO(l2e) // log2(e) : x fmulp // log2(e)*x fld %st // log2(e)*x : log2(e)*x + // Set round-to-nearest temporarily. + subl $8, %esp + cfi_adjust_cfa_offset (8) + fstcw 4(%esp) + movl $0xf3ff, %ecx + andl 4(%esp), %ecx + movl %ecx, (%esp) + fldcw (%esp) frndint // int(log2(e)*x) : log2(e)*x + fldcw 4(%esp) + addl $8, %esp + cfi_adjust_cfa_offset (-8) fsubr %st, %st(1) // int(log2(e)*x) : fract(log2(e)*x) fxch // fract(log2(e)*x) : int(log2(e)*x) f2xm1 // 2^fract(log2(e)*x)-1 : int(log2(e)*x) |