2004-06-30 23:43:49 +00:00
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/* trunc function. PowerPC32 version.
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2004-12-22 20:10:10 +00:00
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Copyright (C) 2004 Free Software Foundation, Inc.
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2004-06-30 23:43:49 +00:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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2004-12-22 20:10:10 +00:00
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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2004-06-30 23:43:49 +00:00
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#include <sysdep.h>
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2005-05-21 19:29:13 +00:00
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.section .rodata.cst4,"aM",@progbits,4
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.align 2
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2004-06-30 23:43:49 +00:00
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.LC0: /* 2**52 */
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2005-05-21 19:29:13 +00:00
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.long 0x59800000
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2004-06-30 23:43:49 +00:00
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/* double [fp1] trunc (double x [fp1])
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IEEE 1003.1 trunc function. IEEE specifies "trunc to the integer
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value, in floating format, nearest to but no larger in magnitude
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then the argument."
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We set "round toward Zero" mode and trunc by adding +-2**52 then
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subtracting +-2**52. */
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2005-05-21 19:01:22 +00:00
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.section ".text"
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2004-06-30 23:43:49 +00:00
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ENTRY (__trunc)
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mffs fp11 /* Save current FPU rounding mode. */
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#ifdef SHARED
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mflr r11
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2005-06-17 23:11:35 +00:00
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# ifdef HAVE_ASM_PPC_REL16
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bcl 20,31,1f
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1: mflr r9
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addis r9,r9,.LC0-1b@ha
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mtlr r11
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lfs fp13,.LC0-1b@l(r9)
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# else
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2004-06-30 23:43:49 +00:00
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bl _GLOBAL_OFFSET_TABLE_@local-4
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mflr r10
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lwz r9,.LC0@got(10)
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mtlr r11
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2005-05-21 19:29:13 +00:00
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lfs fp13,0(r9)
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2005-06-17 23:11:35 +00:00
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# endif
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2004-06-30 23:43:49 +00:00
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#else
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lis r9,.LC0@ha
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2005-05-21 19:29:13 +00:00
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lfs fp13,.LC0@l(r9)
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2004-06-30 23:43:49 +00:00
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#endif
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fabs fp0,fp1
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fsub fp12,fp13,fp13 /* generate 0.0 */
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fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52) */
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fcmpu cr6,fp1,fp12 /* if (x > 0.0) */
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bnllr- cr7
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mtfsfi 7,1 /* Set rounding toward 0 mode. */
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ble- cr6,.L4
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fadd fp1,fp1,fp13 /* x+= TWO52; */
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fsub fp1,fp1,fp13 /* x-= TWO52; */
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2005-01-06 21:52:35 +00:00
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fabs fp1,fp1 /* if (x == 0.0) */
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/* x = 0.0; */
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2004-12-22 20:10:10 +00:00
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mtfsf 0x01,fp11 /* restore previous truncing mode. */
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2004-06-30 23:43:49 +00:00
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blr
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.L4:
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bge- cr6,.L9 /* if (x < 0.0) */
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fsub fp1,fp1,fp13 /* x-= TWO52; */
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fadd fp1,fp1,fp13 /* x+= TWO52; */
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2005-01-06 21:52:35 +00:00
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fnabs fp1,fp1 /* if (x == 0.0) */
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/* x = -0.0; */
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.L9:
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2004-06-30 23:43:49 +00:00
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mtfsf 0x01,fp11 /* restore previous rounding mode. */
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blr
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END (__trunc)
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weak_alias (__trunc, trunc)
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#ifdef NO_LONG_DOUBLE
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weak_alias (__trunc, truncl)
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strong_alias (__trunc, __truncl)
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#endif
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