mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 03:10:05 +00:00
PowerPC: remove wrong truncl implementation for PowerPC64
The truncl assembly implementation (sysdeps/powerpc/powerpc64/fpu/s_truncl.S)
returns wrong results for some inputs where first double is a exact integer
and the precision is determined by second long double.
Checking on implementation comments and history, I am very confident the
assembly implementation was based on a version before commit
5c68d40169 that fixes BZ#2423 (Errors in
long double (ldbl-128ibm) rounding functions in glibc-2.4).
By just removing the implementation and make the build select
sysdeps/ieee754/ldbl-128ibm/s_truncl.c instead it fixes tgammal
issues regarding wrong result sign.
This commit is contained in:
Adhemerval Zanella
parent
3ff6304ee7
commit
38f3458175
@ -1,4 +1,11 @@
|
|||||||
2013-01-08 Adhemerval Zanella <azanella@linux.vnet.ibm.com>
|
2014-01-08 Adhemerval Zanella <azanella@linux.vnet.ibm.com>
|
||||||
|
|
||||||
|
[BZ #16414]
|
||||||
|
* sysdeps/powerpc/powerpc64/fpu/s_truncl.S: Remove wrong
|
||||||
|
implementation.
|
||||||
|
* sysdeps/ieee754/ldbl-128ibm/s_truncl.c: Remove bogus comment.
|
||||||
|
|
||||||
|
2014-01-08 Adhemerval Zanella <azanella@linux.vnet.ibm.com>
|
||||||
|
|
||||||
* sysdeps/powerpc/fpu/libm-test-ulps: Update.
|
* sysdeps/powerpc/fpu/libm-test-ulps: Update.
|
||||||
|
|
||||||
|
|||||||
2
NEWS
2
NEWS
@ -24,7 +24,7 @@ Version 2.19
|
|||||||
16103, 16112, 16143, 16144, 16146, 16150, 16151, 16153, 16167, 16172,
|
16103, 16112, 16143, 16144, 16146, 16150, 16151, 16153, 16167, 16172,
|
||||||
16195, 16214, 16245, 16271, 16274, 16283, 16289, 16293, 16314, 16316,
|
16195, 16214, 16245, 16271, 16274, 16283, 16289, 16293, 16314, 16316,
|
||||||
16330, 16337, 16338, 16356, 16365, 16366, 16369, 16372, 16375, 16379,
|
16330, 16337, 16338, 16356, 16365, 16366, 16369, 16372, 16375, 16379,
|
||||||
16384, 16385, 16386, 16387, 16390, 16400, 16407, 16408.
|
16384, 16385, 16386, 16387, 16390, 16400, 16407, 16408, 16414.
|
||||||
|
|
||||||
* Slovenian translations for glibc messages have been contributed by the
|
* Slovenian translations for glibc messages have been contributed by the
|
||||||
Translation Project's Slovenian team of translators.
|
Translation Project's Slovenian team of translators.
|
||||||
|
|||||||
@ -17,9 +17,6 @@
|
|||||||
License along with the GNU C Library; if not, see
|
License along with the GNU C Library; if not, see
|
||||||
<http://www.gnu.org/licenses/>. */
|
<http://www.gnu.org/licenses/>. */
|
||||||
|
|
||||||
/* This has been coded in assembler because GCC makes such a mess of it
|
|
||||||
when it's coded in C. */
|
|
||||||
|
|
||||||
#include <math.h>
|
#include <math.h>
|
||||||
#include <math_ldbl_opt.h>
|
#include <math_ldbl_opt.h>
|
||||||
#include <float.h>
|
#include <float.h>
|
||||||
|
|||||||
@ -1,120 +0,0 @@
|
|||||||
/* long double trunc function.
|
|
||||||
IBM extended format long double version.
|
|
||||||
Copyright (C) 2004-2014 Free Software Foundation, Inc.
|
|
||||||
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, see
|
|
||||||
<http://www.gnu.org/licenses/>. */
|
|
||||||
|
|
||||||
#include <sysdep.h>
|
|
||||||
#include <math_ldbl_opt.h>
|
|
||||||
|
|
||||||
.section ".toc","aw"
|
|
||||||
.LC0: /* 2**52 */
|
|
||||||
.tc FD_43300000_0[TC],0x4330000000000000
|
|
||||||
.LC1: /* 0.5 */
|
|
||||||
.tc FD_3fe00000_0[TC],0x3fe0000000000000
|
|
||||||
.section ".text"
|
|
||||||
|
|
||||||
/* long double [fp1,fp2] truncl (long double x [fp1,fp2]) */
|
|
||||||
|
|
||||||
ENTRY (__truncl)
|
|
||||||
mffs fp11 /* Save current FPU rounding mode. */
|
|
||||||
lfd fp13,.LC0@toc(2)
|
|
||||||
fabs fp0,fp1
|
|
||||||
fabs fp9,fp2
|
|
||||||
fsub fp12,fp13,fp13 /* generate 0.0 */
|
|
||||||
fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52) */
|
|
||||||
fcmpu cr6,fp1,fp12 /* if (x > 0.0) */
|
|
||||||
bnl- cr7,.L2
|
|
||||||
mtfsfi 7,1 /* Set rounding mode toward 0. */
|
|
||||||
ble- cr6,.L1
|
|
||||||
fneg fp2,fp12
|
|
||||||
fadd fp1,fp1,fp13 /* x+= TWO52; */
|
|
||||||
fsub fp1,fp1,fp13 /* x-= TWO52; */
|
|
||||||
fabs fp1,fp1 /* if (x == 0.0) x = 0.0; */
|
|
||||||
.L0:
|
|
||||||
mtfsf 0x01,fp11 /* restore previous rounding mode. */
|
|
||||||
blr
|
|
||||||
.L1:
|
|
||||||
fneg fp2,fp12
|
|
||||||
bge- cr6,.L0 /* if (x < 0.0) */
|
|
||||||
fsub fp1,fp1,fp13 /* x-= TWO52; */
|
|
||||||
fadd fp1,fp1,fp13 /* x+= TWO52; */
|
|
||||||
fnabs fp1,fp1 /* if (x == 0.0) x = -0.0; */
|
|
||||||
mtfsf 0x01,fp11 /* restore previous rounding mode. */
|
|
||||||
blr
|
|
||||||
|
|
||||||
/* The high double is > TWO52 so we need to round the low double and
|
|
||||||
perhaps the high double. In this case we have to round the low
|
|
||||||
double and handle any adjustment to the high double that may be
|
|
||||||
caused by rounding (up). This is complicated by the fact that the
|
|
||||||
high double may already be rounded and the low double may have the
|
|
||||||
opposite sign to compensate.This gets a bit tricky so we use the
|
|
||||||
following algorithm:
|
|
||||||
|
|
||||||
tau = floor(x_high/TWO52);
|
|
||||||
x0 = x_high - tau;
|
|
||||||
x1 = x_low + tau;
|
|
||||||
r1 = rint(x1);
|
|
||||||
y_high = x0 + r1;
|
|
||||||
y_low = x0 - y_high + r1;
|
|
||||||
return y; */
|
|
||||||
.L2:
|
|
||||||
fcmpu cr7,fp9,fp13 /* if (|x_low| > TWO52) */
|
|
||||||
fcmpu cr0,fp9,fp12 /* || (|x_low| == 0.0) */
|
|
||||||
fcmpu cr5,fp2,fp12 /* if (x_low > 0.0) */
|
|
||||||
bgelr- cr7 /* return x; */
|
|
||||||
beqlr- cr0
|
|
||||||
mtfsfi 7,1 /* Set rounding mode toward 0. */
|
|
||||||
fdiv fp8,fp1,fp13 /* x_high/TWO52 */
|
|
||||||
|
|
||||||
bng- cr6,.L6 /* if (x > 0.0) */
|
|
||||||
fctidz fp0,fp8
|
|
||||||
fcfid fp8,fp0 /* tau = floor(x_high/TWO52); */
|
|
||||||
fadd fp8,fp8,fp8 /* tau++; Make tau even */
|
|
||||||
bng cr5,.L4 /* if (x_low > 0.0) */
|
|
||||||
fmr fp3,fp1
|
|
||||||
fmr fp4,fp2
|
|
||||||
b .L5
|
|
||||||
.L4: /* if (x_low < 0.0) */
|
|
||||||
fsub fp3,fp1,fp8 /* x0 = x_high - tau; */
|
|
||||||
fadd fp4,fp2,fp8 /* x1 = x_low + tau; */
|
|
||||||
.L5:
|
|
||||||
fadd fp5,fp4,fp13 /* r1 = r1 + TWO52; */
|
|
||||||
fsub fp5,fp5,fp13 /* r1 = r1 - TWO52; */
|
|
||||||
b .L9
|
|
||||||
.L6: /* if (x < 0.0) */
|
|
||||||
fctidz fp0,fp8
|
|
||||||
fcfid fp8,fp0 /* tau = floor(x_high/TWO52); */
|
|
||||||
fadd fp8,fp8,fp8 /* tau++; Make tau even */
|
|
||||||
bnl cr5,.L7 /* if (x_low < 0.0) */
|
|
||||||
fmr fp3,fp1
|
|
||||||
fmr fp4,fp2
|
|
||||||
b .L8
|
|
||||||
.L7: /* if (x_low > 0.0) */
|
|
||||||
fsub fp3,fp1,fp8 /* x0 = x_high - tau; */
|
|
||||||
fadd fp4,fp2,fp8 /* x1 = x_low + tau; */
|
|
||||||
.L8:
|
|
||||||
fsub fp5,fp4,fp13 /* r1-= TWO52; */
|
|
||||||
fadd fp5,fp5,fp13 /* r1+= TWO52; */
|
|
||||||
.L9:
|
|
||||||
mtfsf 0x01,fp11 /* restore previous rounding mode. */
|
|
||||||
fadd fp1,fp3,fp5 /* y_high = x0 + r1; */
|
|
||||||
fsub fp2,fp3,fp1 /* y_low = x0 - y_high + r1; */
|
|
||||||
fadd fp2,fp2,fp5
|
|
||||||
blr
|
|
||||||
END (__truncl)
|
|
||||||
|
|
||||||
long_double_symbol (libm, __truncl, truncl)
|
|
||||||
Loading…
Reference in New Issue
Block a user