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+/* Optimized version of the standard strncpy() function.
+ This file is part of the GNU C Library.
+ Copyright (C) 2000 Free Software Foundation, Inc.
+ Contributed by Dan Pop <Dan.Pop@cern.ch>.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+/* Return: dest
+
+ Inputs:
+ in0: dest
+ in1: src
+ in2: char count
+
+ If n >= 24, do a memcpy(dest, src, min(strlen(src)+1, n)), followed by a
+ memset(dest + strlen(src), 0, n - strlen(src) - 1) if necessary.
+
+ Otherwise, copy characters one by one and fill with nulls if necessary. */
+
+#include <sysdep.h>
+#undef ret
+
+#define saved_pfs loc0
+#define saved_b0 loc1
+#define saved_pr loc2
+#define saved_lc loc3
+#define tmp loc4
+#define len loc5
+
+#define dest in0
+#define src in1
+#define n in2
+
+#define rc ret0
+
+ENTRY(strncpy)
+ alloc saved_pfs = ar.pfs, 3, 6, 3, 0
+ mov saved_b0 = b0
+ mov saved_pr = pr
+ mov saved_lc = ar.lc
+ cmp.gtu p6, p0 = 24, n
+(p6) br.cond.spnt .cpyfew
+ mov out0 = src
+ mov tmp = gp ;;
+ br.call.sptk.many b0 = strlen# ;; // rc = strlen(src);
+ add len = 1, rc // include the null in len
+ mov gp = tmp
+ mov out0 = dest ;;
+ cmp.ltu p4, p5 = len, n
+ mov out1 = src ;;
+(p4) mov out2 = len
+(p5) mov out2 = n
+ br.call.sptk.many b0 = memcpy# ;; // memcpy(dest, src, min(len, n));
+ mov gp = tmp
+(p4) add out0 = dest, len
+(p4) mov out1 = r0
+(p4) sub out2 = n, len
+(p4) br.call.sptk.many b0 = memset# ;; // fill the rest with nulls
+(p4) mov gp = tmp
+ mov rc = dest
+ mov b0 = saved_b0
+ mov ar.pfs = saved_pfs
+ mov pr = saved_pr, -1
+ br.ret.sptk.many b0
+.cpyfew:
+ mov rc = dest
+ cmp.eq p6, p0 = n, r0
+ adds n = -1, n
+(p6) br.cond.spnt .restore_and_exit ;; // do nothing if n == 0
+ mov ar.lc = n
+ cmp.eq p6, p0 = r0, r0 ;; // set p6
+.loop:
+(p6) ld1 tmp = [src],1
+ ;;
+ st1 [dest] = tmp, 1
+(p6) cmp.ne p6, p0 = tmp, r0 // clear p6 after encountering the
+ br.cloop.dptk .loop ;; // null character in src
+.restore_and_exit:
+ mov ar.lc = saved_lc
+ mov ar.pfs = saved_pfs
+ br.ret.sptk.many b0
+END(strncpy)