diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc32/power4/fpu/s_llround.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/power4/fpu/s_llround.S | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/s_llround.S b/sysdeps/powerpc/powerpc32/power4/fpu/s_llround.S new file mode 100644 index 0000000000..952d2aa6a5 --- /dev/null +++ b/sysdeps/powerpc/powerpc32/power4/fpu/s_llround.S @@ -0,0 +1,97 @@ +/* llround function. PowerPC32 on PowerPC64 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., 1 Franklin Street, Fifth Floor, Boston MA + 02110-1301 USA. */ + +#include <sysdep.h> +#include <math_ldbl_opt.h> + + .section .rodata.cst8,"aM",@progbits,8 + .align 2 +.LC0: /* 0.0 */ + .long 0x00000000 +.LC1: /* 0.5 */ + .long 0x3f000000 + + .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. */ + +ENTRY (__llround) + stwu r1,-16(r1) + cfi_adjust_cfa_offset (16) +#ifdef SHARED + mflr r11 + cfi_register(lr,r11) +# ifdef HAVE_ASM_PPC_REL16 + bcl 20,31,1f +1: mflr r9 + addis r9,r9,.LC0-1b@ha + addi r9,r9,.LC0-1b@l +# else + bl _GLOBAL_OFFSET_TABLE_@local-4 + mflr r10 + lwz r9,.LC0@got(10) +# endif + mtlr r11 + cfi_same_value (lr) + lfs fp12,0(r9) + lfs fp10,.LC1-.LC0(r9) +#else + lis r9,.LC0@ha + lis r10,.LC1@ha + lfs fp12,.LC0@l(r9) + lfs fp10,.LC1@l(r10) +#endif + fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ + ble- cr6,.L4 + fadd fp1,fp1,fp10 /* x+= 0.5; */ +.L9: + fctidz fp2,fp1 /* Convert To Integer DW round toward 0. */ + stfd fp2,8(r1) + nop /* Ensure the following load is in a different dispatch */ + nop /* group to avoid pipe stall on POWER4&5. */ + nop + lwz r4,12(r1) + lwz r3,8(r1) + addi r1,r1,16 + blr +.L4: + fsub fp1,fp1,fp10 /* x-= 0.5; */ + b .L9 + END (__llround) + +weak_alias (__llround, llround) + +strong_alias (__llround, __llroundf) +weak_alias (__llround, llroundf) + +#ifdef NO_LONG_DOUBLE +weak_alias (__llround, llroundl) +strong_alias (__llround, __llroundl) +#endif +#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1) +compat_symbol (libm, __llround, llroundl, GLIBC_2_1) +#endif |