63 lines
2.0 KiB
ArmAsm
63 lines
2.0 KiB
ArmAsm
/* IA-64 assembly version of the standard strcat() function.
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This file is part of the GNU C Library.
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Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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Contributed by Dan Pop <Dan.Pop@cern.ch>.
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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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* Return: dest
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Inputs:
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in0: dest
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in1: src
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A straightforword implementation: strcpy(dest + strlen(dest), src).
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Could be marginally optimised by inlining the code of strcpy() and
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strlen(), to avoid the two function calls. OTOH, by not doing that,
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we avoid L1I cache pollution (code using strcat() is likely to also
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use strcpy() and strlen(), so we already have a copy of these functions
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in the cache). */
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#include <sysdep.h>
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#undef ret
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#define src in1
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#define dest in0
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#define save_b0 loc0
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#define save_pfs loc1
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#define tmp loc2
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#define rc ret0
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ENTRY(strcat)
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.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
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alloc save_pfs = ar.pfs, 2, 3, 2, 0
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mov save_b0 = b0
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.body
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mov out0 = dest
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mov tmp = gp ;;
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br.call.sptk.many b0 = strlen# ;; // rc = strlen(dest);
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mov gp = tmp
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add out0 = dest, rc
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mov out1 = src
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br.call.sptk.many b0 = strcpy# ;; // strcpy(dest + strlen(dest), src)
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mov gp = tmp
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mov rc = dest
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mov b0 = save_b0
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mov ar.pfs = save_pfs
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br.ret.sptk.many b0
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END(strcat)
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