windows-nt/Source/XPSP1/NT/base/crts/crtw32/string/ia64/strlen.s

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2020-09-26 03:20:57 -05:00
// string.s: function to compute length of string
// Copyright (c) 2000, Intel Corporation
// All rights reserved.
//
// WARRANTY DISCLAIMER
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTEL OR ITS
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Intel Corporation is the author of this code, and requests that all
// problem reports or change requests be submitted to it directly at
// http://developer.intel.com/opensource.
//
.file "string.s"
.section .text
// -- Begin strlen
.proc strlen#
.global strlen#
.align 32
strlen:
{ .mib
alloc r14=ar.pfs,1,7,0,8 //8 rotating registers, 7 locals
mov r11=pr //Save predicate register file
brp.loop.imp .b1_4, .bw1 // Put loop backedge target in TAR
} { .mib
add r35=0,r0 // i = 0;
cmp.eq.unc p7,p0=r32,r0 //check if input s (r32) = 0
(p7) br.cond.dpnt .b1_1 ;; // exit if s=0
}
// Setup for doing software pipelined loops
{ .mii
add r33=0,r0
mov pr.rot=0x30000 // p16=p17=1
mov ar.ec=0 ;;
} { .mfb
mov r9=r32
nop.f 0
nop.b 0;;
}
.b1_4:
{ .mii
ld1.s r37=[r9],1 // *s (r37,r38,r39)
add r32=1,r33 // i++ (r32,r33,r34,r35)
(p19) chk.s r39,.natfault1_0 //
}
.bw1:
{ .mfb
(p19) cmp4.ne p17,p0=r39,r0 // *s==0 (p16,p17,p18)
nop.f 0
(p17) br.wtop.dptk .b1_4 ;; //
}
.b1_1:
{ .mfi
nop.m 0
nop.f 0
sxt4 r8=r35
} { .mib
nop.m 0
mov pr=r11,0x1003e
br.ret.sptk.many b0 ;;
}
.natfault1_0:
add r9 = -3, r9;;
ld1 r39 = [r9],3
br.cond.sptk .bw1;;
_2_1_2auto_size == 0x0
// -- End strlen
.endp strlen#
// mark_proc_addr_taken strlen;
// End