about summary refs log tree commit diff
path: root/sysdeps/powerpc/powerpc64/fpu/s_llroundl.S
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/powerpc/powerpc64/fpu/s_llroundl.S')
-rw-r--r--sysdeps/powerpc/powerpc64/fpu/s_llroundl.S167
1 files changed, 0 insertions, 167 deletions
diff --git a/sysdeps/powerpc/powerpc64/fpu/s_llroundl.S b/sysdeps/powerpc/powerpc64/fpu/s_llroundl.S
deleted file mode 100644
index 29eca11093..0000000000
--- a/sysdeps/powerpc/powerpc64/fpu/s_llroundl.S
+++ /dev/null
@@ -1,167 +0,0 @@
-/* llroundl function.
-   IBM extended format long double version.
-   Copyright (C) 2004, 2006 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, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
-
-#include <sysdep.h>
-#include <math_ldbl_opt.h>
-
-	.section	".toc","aw"
-.LC0:	/* 0.0 */
-	.tc FD_00000000_0[TC],0x0000000000000000
-.LC1:	/* 0.5 */
-	.tc FD_3fe00000_0[TC],0x3fe0000000000000
-.LC2:	/* 2**52 */
-	.tc FD_43300000_0[TC],0x4330000000000000
-.LC3:	/* 2**63 */
-	.tc FD_43E00000_0[TC],0x43e0000000000000
-	.section	".text"
-
-/* long long [r3] llround (long double x [fp1,fp2])
-   IEEE 1003.1 llroundl function.  IEEE specifies "round to the nearest
-   integer value, rounding halfway cases away from zero, regardless of
-   the current rounding mode."  However PowerPC Architecture defines
-   "round to Nearest" as "Choose the best approximation. In case of a
-   tie, choose the one that is even (least significant bit o).".
-   So we can't use the PowerPC "round to Nearest" mode. Instead we set
-   "round toward Zero" mode and round by adding +-0.5 before rounding
-   toward zero. The "Floating Convert To Integer Doubleword with round
-   toward zero" instruction handles the conversion including the
-   overflow cases and signalling "Invalid Operation".
-
-   PowerPC64 long double uses the IBM extended format which is
-   represented two 64-floating point double values. The values are
-   non-overlapping giving an effective precision of 106 bits. The first
-   double contains the high order bits of mantisa and is always rounded
-   to represent a normal rounding of long double to double. Since the
-   long double value is sum of the high and low values, the low double
-   normally has the opposite sign to compensate for the this rounding.
-
-   For long double there is 4 cases:
-   1) |x| < 2**52, all the integer bits are in the high double.
-      Round and convert the high double to long long.
-   2) 2**52 <= |x|< 2**63, Still fits but need bits from both doubles.
-      Round the low double, convert both, then sum the long long values.
-   3) |x| == 2**63, Looks like an overflow but may not be due to rounding
-      of the high double.
-      See the description following lable L2.
-   4) |x| > 2**63, This will overflow the 64-bit signed integer.
-      Treat like case #1. The fctidz instruction will generate the
-      appropriate and signal "invalid operation".
-
-   */
-
-ENTRY (__llroundl)
-	mffs	fp7		/* Save current FPU rounding mode.  */
-	fabs	fp0,fp1
-	lfd	fp13,.LC2@toc(2)	/* 2**52 */
-	lfd	fp12,.LC3@toc(2)	/* 2**63 */
-	lfd	fp11,.LC0@toc(2)	/* 0.0 */
-	lfd	fp10,.LC1@toc(2)	/* 0.5 */
-	fabs	fp9,fp2
-	fcmpu	cr7,fp0,fp13	/* if (fabs(x) > TWO52)  */
-	fcmpu	cr6,fp1,fp11	/* if (x > 0.0)  */
-	bnl-	cr7,.L2
-	mtfsfi	7,1		/* Set rounding mode toward 0.  */
-	ble-	cr6,.L1
-	fadd	fp9,fp1,fp10	/* x+= 0.5;  */
-	b	.L0
-.L1:
-	fsub	fp9,fp1,fp10	/* x-= 0.5;  */
-.L0:
-	fctid	fp0,fp9
-	stfd	fp0,-16(r1)
-	mtfsf	0x01,fp7	/* restore previous rounding mode.  */
-	nop	/* Insure the following load is in a different dispatch group */
-	nop	/* to avoid pipe stall on POWER4&5.  */
-	nop
-	ld	r3,-16(r1)
-	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 = trunc(x_high/TWO52);
-   x0 = x_high - tau;
-   x1 = x_low + tau;
-   r1 = round(x1);
-   y_high = x0 + r1;
-   y_low = x0 - y_high + r1;
-   return y;  */
-.L2:
-	fcmpu	cr7,fp0,fp12	/* if (|x_high| > TWO63)  */
-	fcmpu	cr0,fp9,fp11	/* || (|x_low| == 0.0)  */
-	fmr	fp9,fp1
-	fcmpu	cr5,fp2,fp11	/* if (x_low > 0.0)  */
-	bgt-	cr7,.L0		/*   return llround(x);	*/
-	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 = trunc(x_high/TWO52);  */
-	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,fp10	/* r1 = x1 + 0.5;  */
-	b	.L9
-.L6:				/* if (x < 0.0)  */
-	fctidz	fp0,fp8
-	fcfid	fp8,fp0		/* tau = trunc(x_high/TWO52);  */	
-	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,fp10	/* r1 = x1 - 0.5;  */
-.L9:
-	fctid.	fp11,fp3
-	fctid	fp12,fp5
-	stfd	fp11,-16(r1)
-	stfd	fp12,-8(r1)
-	mtfsf	0x01,fp7	/* restore previous rounding mode.  */
-	nop	/* Insure the following load is in a different dispatch group */
-	nop	/* to avoid pipe stall on POWER4&5.  */
-	nop
-	ld	r3,-16(r1)
-	bunlr   cr1		/* if not overflow, return.  */
-	ld	r0,-8(r1)
-	addo.	r3,r3,r0
-	bnslr	cr0
-	fmr	fp9,fp12
-	bng	cr6,.L0
-	fneg	fp9,fp12
-	b	.L0
-END (__llroundl)
-
-strong_alias (__llroundl, __lroundl)
-long_double_symbol (libm, __llroundl, llroundl)
-long_double_symbol (libm, __lroundl, lroundl)