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+ first implementation, not yet finished
This commit is contained in:
Jonas Maebe
parent
481d3275e0
commit
23306da428
515
rtl/powerpc/strings.inc
Normal file
515
rtl/powerpc/strings.inc
Normal file
@ -0,0 +1,515 @@
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{
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$Id$
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This file is part of the Free Pascal run time library.
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Copyright (c) 2000 by Jonas Maebe, member of the
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Free Pascal development team
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Processor dependent part of strings.pp, that can be shared with
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sysutils unit.
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program 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.
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**********************************************************************}
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{ Note: the implementation of these routines is for BIG ENDIAN only!! (JM) }
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function strcopy(dest,source : pchar) : pchar;assembler;
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{ in: dest in r3, source in r4 }
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{ out: result (dest) in r3 }
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asm
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{ empty/invalid string? }
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cmpli r3,0
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{ if yes, do nothing }
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beq .LStrCopyDone
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{ clear two lowest bits of source address }
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rlwminm r28,r4,0,0,31-2
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{ get # of misaligned bytes }
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sub. r28,r28,r4
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{ since we have to return dest intact, use another register for }
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{ dest in the copy loop }
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mr r29,r3
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beq .LStrCopyAligned
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.LStrCopyAlignLoop:
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{ decrease misaligned bytes counter (do it here already to improve }
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{ jump prediction) }
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subic. r28,1
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{ load next byte }
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lbz r27,(r4)
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{ end of string? }
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cmpli cr1,r27,0
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{ point to next source byte }
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addi r4,r4,1
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{ store byte }
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stb r27,(r29)
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{ point to next dest address }
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addi r29,r29,1
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{ stop if end of string }
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beq cr1,.LStrCopyDone
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bne .LStrCopyAlignLoop
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.balign 16
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.LStrCopyAligned:
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{ load next 4 bytes }
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lwz r27,(r4)
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{ first/highest byte zero? (big endian!) }
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andis. r28,r27,0x0ff00
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addi r4,r4,4
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beq .LStrCopyByte
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{ second byte zero? }
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andis. r28,r27,0x00ff
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beq .LStrCopyWord
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{ third byte zero? }
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andi. r28,r27,0xff00
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beq .LStrCopy3Bytes
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{ fourth byte zero? }
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andi. r28,r27,0x00ff
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{ store next 4 bytes }
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stw r27,(r29)
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{ increase dest address }
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addi r29,r29,4
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beq .LStrCopyDone
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b .LStrCopyAligned
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{ store left-overs }
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.LStrCopy3Bytes:
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sth r27,(r29)
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li r27,0
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stb r27,2(r29)
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b .LStrCopyDone
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.LStrCopyWord:
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sth r27,(r29)
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b .LStrCopyDone
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.LStrCopyByte:
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stb r27,(r29)
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.LStrCopyDone:
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{ r3 still contains dest here }
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end ['r4','r27','r28','r29','cr0','cr1'];
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function strecopy(dest,source : pchar) : pchar;assembler;
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{ in: dest in r3, source in r4 }
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{ out: result (end of new dest) in r3 }
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asm
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{ empty/invalid string? }
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cmpli r3,0
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{ if yes, do nothing }
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beq .LStreCopyDone
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{ clear two lowest bits of source address }
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rlwminm r28,r4,0,0,31-2
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{ get # of misaligned bytes }
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sub. r28,r28,r4
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beq .LStreCopyAligned
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.LStreCopyAlignLoop:
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{ decrease misaligned bytes counter (do it here already to improve }
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{ jump prediction) }
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subic. r28,1
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{ load next byte }
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lbz r27,(r4)
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{ end of string? }
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cmpli cr1,r27,0
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{ point to next source byte }
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addi r4,r4,1
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{ store byte }
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stb r27,(r3)
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{ stop if end of string }
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beq cr1,.LStreCopyDone
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{ point to next dest address }
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addi r3,r3,1
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{ loop if misaligned bytes left }
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bne .LStreCopyAlignLoop
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.balign 16
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.LStreCopyAligned:
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{ load next 4 bytes }
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lwz r27,(r4)
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{ first/highest byte zero? (big endian!) }
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andis. r28,r27,0x0ff00
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addi r4,r4,4
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beq .LStreCopyByte
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{ second byte zero? }
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andis. r28,r27,0x00ff
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beq .LStreCopyWord
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{ third byte zero? }
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andi. r28,r27,0xff00
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beq .LStreCopy3Bytes
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{ fourth byte zero? }
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andi. r28,r27,0x00ff
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{ store next 4 bytes }
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stw r27,(r3)
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{ increase dest address }
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{ the result must point to the terminating #0, so only add 3 }
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addi r3,r3,3
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beq .LStreCopyDone
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{ add another 1 for next char }
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addi r3,r3,1
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b .LStreCopyAligned
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{ store left-overs }
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.LStreCopy3Bytes:
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sth r27,(r3)
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li r27,0
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stbu r27,2(r3)
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b .LStrCopyDone
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.LStreCopyWord:
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sth r27,(r3)
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addi r3,r3,1
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b .LStrCopyDone
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.LStreCopyByte:
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stb r27,(r3)
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.LStreCopyDone:
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{ r3 contains end of new string now }
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end ['r3','r4','r27','r28','cr0','cr1'];
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function strlcopy(dest,source : pchar;maxlen : longint) : pchar;assembler;
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asm
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{ in: dest in r3, source in r4, maxlen in r5 }
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{ out: result (dest) in r3 }
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asm
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{ empty/invalid string? }
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cmpli r3,0
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{ if yes, do nothing }
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beq .LStrlCopyDone
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{ maxlen in counter }
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mtctr r5
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{ clear two lowest bits of source address }
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rlwminm r28,r4,0,0,31-2
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{ get # of misaligned bytes }
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sub. r28,r28,r4
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{ since we have to return dest intact, use another register for }
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{ dest in the copy loop }
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mr r29,r3
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beq .LStrlCopyAligned
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.LStrlCopyAlignLoop:
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{ if decreased maxlen counter = 0 (dz), stop }
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bdz .LStrlCopyByte
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{ decrease misaligned bytes counter (do it here already to improve }
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{ jump prediction) }
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subic. r28,1
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{ load next byte }
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lbz r27,(r4)
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{ end of string? }
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cmpli cr1,r27,0
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{ point to next source byte }
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addi r4,r4,1
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{ store byte }
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stb r27,(r29)
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{ point to next dest address }
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addi r29,r29,1
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{ stop if end of string }
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beq cr1,.LStrlCopyDone
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{ loop while unaligned byte counter <> 0 }
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bne .LStrlCopyAlignLoop
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.balign 16
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.LStrlCopyAligned:
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{ load next 4 bytes }
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lwz r27,(r4)
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{ first/highest byte zero? (big endian!) }
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andis. r28,r27,0x0ff00
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addi r4,r4,4
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{ if decremented maxlen counter not zero (dnz) and no #0 (ne), }
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{ continue (and hint that the most likely case is jump taken) }
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bdnzne+ .LNoStrlCopyByte
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b .LStrlCopyByte
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.LNoStrlCopyByte:
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{ second byte zero? }
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andis. r28,r27,0x00ff
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bdnzne+ .LNoStrlCopyWord
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b .LStrlCopyWord
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.LNoStrlCopyWord:
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{ third byte zero? }
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andi. r28,r27,0xff00
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bdnzne+ .LNoStrlCopy3Bytes
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b .LStrlCopy3Bytes
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.LNoStrlCopy3Bytes:
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{ fourth byte zero? }
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andi. r28,r27,0x00ff
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{ store next 4 bytes }
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stw r27,(r29)
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{ increase dest address }
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addi r29,r29,4
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bdnzne .LStrlCopyAligned
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{ replace last char with a #0 in case we stopped because the maxlen }
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{ was reached }
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li r27,0
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stb r27,-1(r29)
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b .LStrlCopyDone
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{ store left-overs }
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.LStrlCopy3Bytes:
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{ big endian! So move upper 16bits to lower 16bits}
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srwi r27,r27,16
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sth r27,(r29)
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li r27,0
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stb r27,2(r29)
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b .LStrlCopyDone
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.LStrlCopyWord:
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{ clear lower 8 bits of low 16 bits }
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andi r27,r27,0x0ff00
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sth r27,(r29)
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b .LStrlCopyDone
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.LStrlCopyByte:
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li r27,0
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stb r27,(r29)
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.LStrlCopyDone:
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{ r3 still contains dest here }
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end ['r4','r27','r28','r29','cr0','cr1','ctr'];
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function strlen(p : pchar) : longint;assembler;
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{ in: p in r3 }
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{ out: result (length) in r3 }
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{ WARNING: if the used registers change here, also change strend!! (JM) }
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asm
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{ empty/invalid string? }
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cmpli r3,0
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{ if yes, do nothing }
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beq .LStrLenNil
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{ clear two lowest bits of source address }
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rlwminm r28,r3,0,0,31-2
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{ get # of misaligned bytes }
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sub. r28,r28,r3
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{ at the end, we substract r29 from r3 to get the length }
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mr r29,r3
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beq .LStrLenAligned
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.LStrLenAlignLoop:
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{ decrease misaligned bytes counter (do it here already to improve }
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{ jump prediction) }
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subic. r28,1
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{ load next byte }
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lbz r27,(r3)
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{ end of string? }
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cmpli cr1,r27,0
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{ stop if end of string }
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beq cr1,.LStrLenDone
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{ point to next source byte }
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addi r3,r3,1
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bne .LStrLenAlignLoop
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.balign 16
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.LStrLenAligned:
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{ load next 4 bytes }
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lwz r27,(r3)
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{ first/highest byte zero? (big endian!) }
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andis. r28,r27,0x0ff00
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beq .LStrLenDone
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{ second byte zero? }
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andis. r28,r27,0x00ff
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{ increase length }
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addi r3,r3,1
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beq .LStrLenDone
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{ third byte zero? }
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andi. r28,r27,0xff00
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addi r3,r3,1
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beq .LStrLenDone
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{ fourth byte zero? }
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andi. r28,r27,0x00ff
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addi r3,r3,1
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beq .LStrLenDone
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addi r3,r3,1
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b .LStrLenAligned
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.LStrLenDone:
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sub r3,r29,r3
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.LStrLenNil:
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end ['r3','r27','r28','r29','cr0','cr1'];
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function strend(p : pchar) : pchar;assembler;
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asm
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mr r26,r3
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mflr r25
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bl strlen
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mtlr r25
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add r3,r26,r3
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end ['r3','r25','r26','r27','r28','r29','cr0','cr1'];
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function strcomp(str1,str2 : pchar) : longint;assembler;
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{ in: str1 in r3, str2 in r4 }
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{ out: result (= 0 if strings equal, < 0 if str1 < str2, > 0 if str1 > str2 }
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{ in r3 }
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asm
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{ !!! }
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end;
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function strlcomp(str1,str2 : pchar;l : longint) : longint;assembler;
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{ (same as strcomp, but maximally compare until l'th character) }
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{ in: str1 in r3, str2 in r4, l in r5 }
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{ out: result (= 0 if strings equal, < 0 if str1 < str2, > 0 if str1 > str2 }
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{ in r3 }
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asm
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{ !!! }
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end;
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function stricomp(str1,str2 : pchar) : longint;assembler;
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{ in: str1 in r3, str2 in r4 }
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{ out: result (= index of first differing character) in r3 }
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asm
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{ !!! }
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end;
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function strlicomp(str1,str2 : pchar;l : longint) : longint;assembler;
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{ (same as stricomp, but maximally compare until l'th character) }
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{ in: str1 in r3, str2 in r4, l in r5 }
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{ out: result (= index of first differing character) in r3 }
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asm
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{ !!! }
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end;
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function strscan(p : pchar;c : char) : pchar;assembler;
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asm
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movl p,%eax
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xorl %ecx,%ecx
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testl %eax,%eax
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jz .LSTRSCAN
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// align
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movb c,%cl
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movl %eax,%esi
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andl $0xfffffff8,%eax
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movl $0xff,%edx
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movl p,%edi
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subl %eax,%esi
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jz .LSTRSCANLOOP
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xorl %eax,%eax
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.LSTRSCANALIGNLOOP:
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movb (%edi),%al
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// at .LSTRSCANFOUND, one is substracted from edi to calculate the position,
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// so add 1 here already (not after .LSTRSCAN, because then the test/jz and
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// cmp/je can't be paired)
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incl %edi
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testb %al,%al
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jz .LSTRSCAN
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cmpb %cl,%al
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je .LSTRSCANFOUND
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decl %esi
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jnz .LSTRSCANALIGNLOOP
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jmp .LSTRSCANLOOP
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.balign 16
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.LSTRSCANLOOP:
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movl (%edi),%eax
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movl %eax,%esi
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// first char
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andl %edx,%eax
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// end of string -> stop
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jz .LSTRSCAN
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shrl $8,%esi
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cmpl %ecx,%eax
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movl %esi,%eax
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je .LSTRSCANFOUND1
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// second char
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andl %edx,%eax
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jz .LSTRSCAN
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shrl $8,%esi
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cmpl %ecx,%eax
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movl %esi,%eax
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je .LSTRSCANFOUND2
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// third char
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andl %edx,%eax
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jz .LSTRSCAN
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shrl $8,%esi
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cmpl %ecx,%eax
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movl %esi,%eax
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je .LSTRSCANFOUND3
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// fourth char
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// all upper bits have already been cleared
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testl %eax,%eax
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jz .LSTRSCAN
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addl $4,%edi
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cmpl %ecx,%eax
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je .LSTRSCANFOUND
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jmp .LSTRSCANLOOP
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.LSTRSCANFOUND3:
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leal 2(%edi),%eax
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jmp .LSTRSCAN
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.LSTRSCANFOUND2:
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leal 1(%edi),%eax
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jmp .LSTRSCAN
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.LSTRSCANFOUND1:
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movl %edi,%eax
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jmp .LSTRSCAN
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.LSTRSCANFOUND:
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leal -1(%edi),%eax
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.LSTRSCAN:
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end ['EAX','ECX','ESI','EDI','EDX'];
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function strrscan(p : pchar;c : char) : pchar;assembler;
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asm
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xorl %eax,%eax
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movl p,%edi
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orl %edi,%edi
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jz .LSTRRSCAN
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movl $0xffffffff,%ecx
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cld
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xorb %al,%al
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repne
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scasb
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not %ecx
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movb c,%al
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movl p,%edi
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addl %ecx,%edi
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decl %edi
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std
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repne
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scasb
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cld
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movl $0,%eax
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jnz .LSTRRSCAN
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movl %edi,%eax
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incl %eax
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.LSTRRSCAN:
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end ['EAX','ECX','EDI'];
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function strupper(p : pchar) : pchar;assembler;
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asm
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movl p,%esi
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orl %esi,%esi
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jz .LStrUpperNil
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movl %esi,%edi
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.LSTRUPPER1:
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lodsb
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cmpb $97,%al
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jb .LSTRUPPER3
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cmpb $122,%al
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ja .LSTRUPPER3
|
||||
subb $0x20,%al
|
||||
.LSTRUPPER3:
|
||||
stosb
|
||||
orb %al,%al
|
||||
jnz .LSTRUPPER1
|
||||
.LStrUpperNil:
|
||||
movl p,%eax
|
||||
end ['EAX','ESI','EDI'];
|
||||
|
||||
|
||||
function strlower(p : pchar) : pchar;assembler;
|
||||
asm
|
||||
movl p,%esi
|
||||
orl %esi,%esi
|
||||
jz .LStrLowerNil
|
||||
movl %esi,%edi
|
||||
.LSTRLOWER1:
|
||||
lodsb
|
||||
cmpb $65,%al
|
||||
jb .LSTRLOWER3
|
||||
cmpb $90,%al
|
||||
ja .LSTRLOWER3
|
||||
addb $0x20,%al
|
||||
.LSTRLOWER3:
|
||||
stosb
|
||||
orb %al,%al
|
||||
jnz .LSTRLOWER1
|
||||
.LStrLowerNil:
|
||||
movl p,%eax
|
||||
end ['EAX','ESI','EDI'];
|
||||
|
||||
{
|
||||
$Log$
|
||||
Revision 1.1 2000-11-05 17:17:08 jonas
|
||||
+ first implementation, not yet finished
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user