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Diffstat (limited to 'sysdeps/powerpc/powerpc64/fpu/s_llround.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/fpu/s_llround.S | 86 |
1 files changed, 0 insertions, 86 deletions
diff --git a/sysdeps/powerpc/powerpc64/fpu/s_llround.S b/sysdeps/powerpc/powerpc64/fpu/s_llround.S deleted file mode 100644 index 7180779921..0000000000 --- a/sysdeps/powerpc/powerpc64/fpu/s_llround.S +++ /dev/null @@ -1,86 +0,0 @@ -/* llround function. PowerPC64 version. - Copyright (C) 2004-2019 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> -#include <libm-alias-double.h> - - .section ".toc","aw" -.LC0: /* 2^52 */ - .tc FD_43300000_0[TC],0x4330000000000000 -.LC1: /* 0.5 */ - .tc FD_3fe00000_0[TC],0x3fe0000000000000 - .section ".text" - -/* long long [r3] llround (double x [fp1]) - IEEE 1003.1 llround 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. Likewise - if x is and odd number between +-(2^52 and 2^53-1) a shift and - carry will erroneously round if biased with +-0.5. Therefore if x - is greater/less than +-2^52 we don't need to bias the number with - +-0.5. */ - -ENTRY (__llround) - CALL_MCOUNT 0 - lfd fp9,.LC0@toc(2) /* Load 2^52 into fpr9. */ - lfd fp10,.LC1@toc(2)/* Load 0.5 into fpr10. */ - fabs fp2,fp1 /* Get the absolute value of x. */ - fsub fp12,fp10,fp10 /* Compute 0.0 into fp12. */ - fcmpu cr6,fp2,fp10 /* if |x| < 0.5 */ - fcmpu cr7,fp2,fp9 /* if |x| >= 2^52 */ - fcmpu cr1,fp1,fp12 /* x is negative? x < 0.0 */ - blt- cr6,.Lretzero /* 0.5 > x < -0.5 so just return 0. */ - bge- cr7,.Lnobias /* 2^52 > x < -2^52 just convert with no bias. */ - /* Test whether an integer to avoid spurious "inexact". */ - fadd fp3,fp2,fp9 - fsub fp3,fp3,fp9 - fcmpu cr5,fp2,fp3 - beq cr5,.Lnobias - fadd fp3,fp2,fp10 /* |x|+=0.5 bias to prepare to round. */ - bge cr1,.Lconvert /* x is positive so don't negate x. */ - fnabs fp3,fp3 /* -(|x|+=0.5) */ -.Lconvert: - fctidz fp4,fp3 /* Convert to Integer double word round toward 0. */ - stfd fp4,-16(r1) - nop - nop - nop - ld r3,-16(r1) /* Load return as integer. */ -.Lout: - blr -.Lretzero: /* 0.5 > x > -0.5 */ - li r3,0 /* return 0. */ - b .Lout -.Lnobias: - fmr fp3,fp1 - b .Lconvert - END (__llround) - -strong_alias (__llround, __lround) -libm_alias_double (__llround, llround) -libm_alias_double (__lround, lround) |