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