diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc64/fpu/s_llrintl.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/fpu/s_llrintl.S | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/fpu/s_llrintl.S b/sysdeps/powerpc/powerpc64/fpu/s_llrintl.S new file mode 100644 index 0000000000..aa487775d4 --- /dev/null +++ b/sysdeps/powerpc/powerpc64/fpu/s_llrintl.S @@ -0,0 +1,94 @@ +/* Round long double to long int. + IBM extended format long double 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., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> +#include <math_ldbl_opt.h> + + .section ".toc","aw" +.LC0: /* 2**52 */ + .tc FD_43300000_0[TC],0x4330000000000000 +.LC1: /* 2**63 */ + .tc FD_43E00000_0[TC],0x43e0000000000000 + .section ".text" + +/* long long int[r3] __llrintl (long double x[fp1,fp2]) */ +ENTRY (__llrintl) + lfd fp13,.LC0@toc(2) + lfd fp10,.LC1@toc(2) + fabs fp0,fp1 + fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52) */ + fcmpu cr6,fp0,fp10 /* if (fabs(x) > TWO63) */ + beq- cr6,.L2 + fctid fp11,fp1 /* must delay this opperation to here */ + fctid fp12,fp2 /* and avoid setting "invalid operation". */ + li r0,0 + stfd fp11,-16(r1) + bgt- cr6,.L9 /* if > TWO63 return "invalid operation". */ + ble+ cr7,.L9 /* If < TWO52 only thy high double is used. */ + stfd fp12,-8(r1) + nop /* Insure the following load is in a different dispatch group */ + nop /* to avoid pipe stall on POWER4&5. */ + nop +.L8: + ld r0,-8(r1) +.L9: + ld r3,-16(r1) + add r3,r3,r0 + blr + +/* The high double is >= TWO63 so it looks like we are "out of range". + But this may be caused by rounding of the high double and the + negative low double may bring it back into range. So we need to + de-round the high double and invert the low double without changing + the effective long double value. To do this we compute a special + value (tau) that we can subtract from the high double and add to + the low double before conversion. The resulting integers can be + summed to get the total value. + + tau = floor(x_high/TWO52); + x0 = x_high - tau; + x1 = x_low + tau; */ +.L2: + fdiv fp8,fp1,fp13 /* x_high/TWO52 */ + fctidz fp0,fp8 + fcfid fp8,fp0 /* tau = floor(x_high/TWO52); */ + fsub fp3,fp1,fp8 /* x0 = x_high - tau; */ + fadd fp4,fp2,fp8 /* x1 = x_low + tau; */ + fctid fp11,fp3 + fctid fp12,fp4 + stfd fp11,-16(r1) + stfd fp12,-8(r1) + nop /* Insure the following load is in a different dispatch group */ + nop /* to avoid pipe stall on POWER4&5. */ + nop + ld r3,-16(r1) + ld r0,-8(r1) + addo. r3,r3,r0 + bnslr+ cr0 /* if the sum does not overflow, return. */ + fctid fp11,fp1 /* Otherwise we want to set "invalid operation". */ + li r0,0 + stfd fp11,-16(r1) + b .L9 + +END (__llrintl) + +strong_alias (__llrintl, __lrintl) +long_double_symbol (libm, __llrintl, llrintl) +long_double_symbol (libm, __lrintl, lrintl) |