mirror of https://github.com/tongzx/nt5src
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
83 lines
2.2 KiB
83 lines
2.2 KiB
// 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
|