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Diffstat (limited to 'REORG.TODO/sysdeps/powerpc/powerpc32/fpu/s_lround.S')
| -rw-r--r-- | REORG.TODO/sysdeps/powerpc/powerpc32/fpu/s_lround.S | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/powerpc/powerpc32/fpu/s_lround.S b/REORG.TODO/sysdeps/powerpc/powerpc32/fpu/s_lround.S new file mode 100644 index 0000000000..e4ec1bb0b6 --- /dev/null +++ b/REORG.TODO/sysdeps/powerpc/powerpc32/fpu/s_lround.S @@ -0,0 +1,129 @@ +/* lround function. PowerPC32 version. + Copyright (C) 2004-2017 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 .rodata.cst4,"aM",@progbits,4 + .align 2 +.LC0: /* 0.5 */ + .long 0x3f000000 +.LC1: /* 2^52. */ + .long 0x59800000 + .section .rodata.cst8,"aM",@progbits,8 + .align 3 +.LC2: /* 0x7fffffff.8p0. */ + .long 0x41dfffff + .long 0xffe00000 +.LC3: /* -0x80000000.8p0. */ + .long 0xc1e00000 + .long 0x00100000 + .section ".text" + +/* long [r3] lround (float x [fp1]) + IEEE 1003.1 lround 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. It is necessary to detect when x is + (+-)0x1.fffffffffffffp-2 because adding +-0.5 in this case will + cause an erroneous shift, carry and round. We simply return 0 if + 0.5 > x > -0.5. */ + +ENTRY (__lround) + stwu r1,-16(r1) + cfi_adjust_cfa_offset (16) +#ifdef SHARED + mflr r11 + cfi_register(lr,r11) + SETUP_GOT_ACCESS(r9,got_label) + addis r10,r9,.LC0-got_label@ha + lfs fp10,.LC0-got_label@l(r10) + addis r10,r9,.LC1-got_label@ha + lfs fp11,.LC1-got_label@l(r10) + addis r10,r9,.LC2-got_label@ha + lfd fp9,.LC2-got_label@l(r10) + addis r10,r9,.LC3-got_label@ha + lfd fp8,.LC3-got_label@l(r10) + mtlr r11 + cfi_same_value (lr) +#else + lis r9,.LC0@ha + lfs fp10,.LC0@l(r9) + lis r9,.LC1@ha + lfs fp11,.LC1@l(r9) + lis r9,.LC2@ha + lfd fp9,.LC2@l(r9) + lis r9,.LC3@ha + lfd fp8,.LC3@l(r9) +#endif + fabs fp2, fp1 /* Get the absolute value of x. */ + fsub fp12,fp10,fp10 /* Compute 0.0. */ + fcmpu cr6, fp2, fp10 /* if |x| < 0.5 */ + fcmpu cr5, fp1, fp9 /* if x >= 0x7fffffff.8p0 */ + fcmpu cr1, fp1, fp8 /* if x <= -0x80000000.8p0 */ + fcmpu cr7, fp1, fp12 /* x is negative? x < 0.0 */ + blt- cr6,.Lretzero + bge- cr5,.Loflow + ble- cr1,.Loflow + /* Test whether an integer to avoid spurious "inexact". */ + fadd fp3,fp2,fp11 + fsub fp3,fp3,fp11 + fcmpu cr5, fp2, fp3 + beq cr5,.Lnobias + fadd fp3,fp2,fp10 /* |x|+=0.5 bias to prepare to round. */ + bge cr7,.Lconvert /* x is positive so don't negate x. */ + fnabs fp3,fp3 /* -(|x|+=0.5) */ +.Lconvert: + fctiwz fp4,fp3 /* Convert to Integer word lround toward 0. */ + stfd fp4,8(r1) + nop /* Ensure the following load is in a different dispatch */ + nop /* group to avoid pipe stall on POWER4&5. */ + nop + lwz r3,8+LOWORD(r1) /* Load return as integer. */ +.Lout: + addi r1,r1,16 + blr +.Lretzero: /* when 0.5 > x > -0.5 */ + li r3,0 /* return 0. */ + b .Lout +.Lnobias: + fmr fp3,fp1 + b .Lconvert +.Loflow: + fmr fp3,fp11 + bge cr7,.Lconvert + fnabs fp3,fp3 + b .Lconvert + END (__lround) + +weak_alias (__lround, lround) + +strong_alias (__lround, __lroundf) +weak_alias (__lround, lroundf) + +#ifdef NO_LONG_DOUBLE +weak_alias (__lround, lroundl) +strong_alias (__lround, __lroundl) +#endif +#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1) +compat_symbol (libm, __lround, lroundl, GLIBC_2_1) +#endif |