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59 lines
2.1 KiB
ArmAsm
59 lines
2.1 KiB
ArmAsm
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/* lround function. POWER5+, PowerPC32 version.
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Copyright (C) 2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 1 Franklin Street, Fifth Floor, Boston MA
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02110-1301 USA. */
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#include <sysdep.h>
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#include <math_ldbl_opt.h>
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/* long [r3] lround (float x [fp1])
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IEEE 1003.1 lround function. IEEE specifies "round to the nearest
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integer value, rounding halfway cases away from zero, regardless of
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the current rounding mode." However PowerPC Architecture defines
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"round to Nearest" as "Choose the best approximation. In case of a
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tie, choose the one that is even (least significant bit o).".
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So we pre-round using the V2.02 Floating Round to Integer Nearest
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instruction before we use the Floating Convert to Integer Word with
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round to zero instruction. */
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.machine "power5"
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ENTRY (__lround)
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stwu r1,-16(r1)
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cfi_adjust_cfa_offset (16)
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frin fp2,fp1
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fctiwz fp3,fp2 /* Convert To Integer Word lround toward 0. */
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stfd fp3,8(r1)
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nop /* Ensure the following load is in a different dispatch */
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nop /* group to avoid pipe stall on POWER4&5. */
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nop
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lwz r3,12(r1)
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addi r1,r1,16
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blr
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END (__lround)
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weak_alias (__lround, lround)
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strong_alias (__lround, __lroundf)
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weak_alias (__lround, lroundf)
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#ifdef NO_LONG_DOUBLE
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weak_alias (__lround, lroundl)
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strong_alias (__lround, __lroundl)
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#endif
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#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1)
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compat_symbol (libm, __lround, lroundl, GLIBC_2_1)
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#endif
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