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| author | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
|---|---|---|
| committer | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
| commit | 5046dbb4a7eba5eccfd258f92f4735c9ffc8d069 (patch) | |
| tree | 4470480d904b65cf14ca524f96f79eca818c3eaf /REORG.TODO/sysdeps/i386/fpu/s_log1pl.S | |
| parent | 199fc19d3aaaf57944ef036e15904febe877fc93 (diff) | |
| download | glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.tar glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.tar.gz glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.tar.bz2 glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.zip | |
Prepare for radical source tree reorganization.zack/build-layout-experiment
All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).
Diffstat (limited to 'REORG.TODO/sysdeps/i386/fpu/s_log1pl.S')
| -rw-r--r-- | REORG.TODO/sysdeps/i386/fpu/s_log1pl.S | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/i386/fpu/s_log1pl.S b/REORG.TODO/sysdeps/i386/fpu/s_log1pl.S new file mode 100644 index 0000000000..0fd05cbdb3 --- /dev/null +++ b/REORG.TODO/sysdeps/i386/fpu/s_log1pl.S @@ -0,0 +1,76 @@ +/* + * Written by J.T. Conklin <jtc@netbsd.org>. + * Public domain. + * + * Adapted for `long double' by Ulrich Drepper <drepper@cygnus.com>. + */ + +#include <machine/asm.h> + +RCSID("$NetBSD: s_log1p.S,v 1.7 1995/05/09 00:10:58 jtc Exp $") + + .section .rodata + + .align ALIGNARG(4) + /* The fyl2xp1 can only be used for values in + -1 + sqrt(2) / 2 <= x <= 1 - sqrt(2) / 2 + 0.29 is a safe value. + */ +limit: .tfloat 0.29 + /* Please note: we use a double value here. Since 1.0 has + an exact representation this does not effect the accuracy + but it helps to optimize the code. */ +one: .double 1.0 + +#ifdef PIC +# define MO(op) op##@GOTOFF(%edx) +#else +# define MO(op) op +#endif + +/* + * Use the fyl2xp1 function when the argument is in the range -0.29 to 0.29, + * otherwise fyl2x with the needed extra computation. + */ + .text +ENTRY(__log1pl) + fldln2 + + fldt 4(%esp) + +#ifdef PIC + LOAD_PIC_REG (dx) +#endif + + fxam + fnstsw + fld %st + sahf + jc 3f // in case x is NaN or ħInf +4: + fabs + fldt MO(limit) + fcompp + fnstsw + sahf + jnc 2f + + movzwl 4+8(%esp), %eax + xorb $0x80, %ah + cmpl $0xc040, %eax + jae 5f + + faddl MO(one) +5: fyl2x + ret + +2: fyl2xp1 + ret + +3: jp 4b // in case x is ħInf + fstp %st(1) + fstp %st(1) + fadd %st(0) + ret + +END (__log1pl) |