/* roundf function. PowerPC64 version. Copyright (C) 2004-2015 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 . */ #include .section ".toc","aw" .p2align 3 .LC0: /* 2**23 */ .long 0x4b000000 .LC1: /* 0.5 */ .long 0x3f000000 .section ".text" /* float [fp1] roundf (float x [fp1]) IEEE 1003.1 round 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 to the integer value. */ EALIGN (__roundf, 4, 0) CALL_MCOUNT 0 lfs fp13,.LC0@toc(2) fabs fp0,fp1 fsubs fp12,fp13,fp13 /* generate 0.0 */ fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO23) */ mffs fp11 /* Save current FPU rounding mode and "inexact" state. */ fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ bnllr- cr7 mtfsfi 7,1 /* Set rounding mode toward 0. */ lfs fp10,.LC1@toc(2) ble- cr6,.L4 fadds fp1,fp1,fp10 /* x+= 0.5; */ fadds fp1,fp1,fp13 /* x+= TWO23; */ fsubs fp1,fp1,fp13 /* x-= TWO23; */ fabs fp1,fp1 /* if (x == 0.0) */ /* x = 0.0; */ mtfsf 0xff,fp11 /* Restore previous rounding mode and "inexact" state. */ blr .L4: fsubs fp9,fp1,fp10 /* x+= 0.5; */ bge- cr6,.L9 /* if (x < 0.0) */ fsubs fp1,fp9,fp13 /* x-= TWO23; */ fadds fp1,fp1,fp13 /* x+= TWO23; */ fnabs fp1,fp1 /* if (x == 0.0) */ /* x = -0.0; */ .L9: mtfsf 0xff,fp11 /* Restore previous rounding mode and "inexact" state. */ blr END (__roundf) weak_alias (__roundf, roundf)