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+ added an i8086 asm optimized IndexDWord routine

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git-svn-id: trunk@31960 -
This commit is contained in:
nickysn 2015-10-06 14:52:58 +00:00
parent 3faf91a270
commit 3752047dd4
1 changed files with 48 additions and 0 deletions
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48
rtl/i8086/i8086.inc
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@ -228,6 +228,54 @@ end;
{$endif FPC_SYSTEM_HAS_INDEXWORD}
{$ifndef FPC_SYSTEM_HAS_INDEXDWORD}
{$define FPC_SYSTEM_HAS_INDEXDWORD}
function IndexDWord(Const buf;len:SizeInt;b:DWord):SizeInt; assembler; nostackframe;
asm
mov bx, sp
mov cx, ss:[bx + 6 + extra_param_offset] // len
or cx, cx
jz @@NotFound
{$ifdef FPC_X86_DATA_NEAR}
mov di, ss:[bx + 8 + extra_param_offset] // @buf
mov ax, ds
mov es, ax
{$else FPC_X86_DATA_NEAR}
les di, ss:[bx + 8 + extra_param_offset] // @buf
{$endif FPC_X86_DATA_NEAR}
mov si, cx // save the length of the buffer in si
mov ax, ss:[bx + 2 + extra_param_offset] // b
mov bx, ss:[bx + 4 + extra_param_offset]
{$ifdef FPC_ENABLED_CLD}
cld
{$endif FPC_ENABLED_CLD}
jmp @@LoopStart
@@SkipWord:
scasw
@@LoopStart:
scasw
loopne @@SkipWord
jne @@NotFound
xchg ax, bx
scasw
je @@Found
jcxz @@NotFound
xchg ax, bx
jmp @@LoopStart
@@Found:
sub si, cx
xchg ax, si
dec ax
jmp @@Done
@@NotFound:
mov ax, 0FFFFh // return -1
@@Done:
end;
{$endif FPC_SYSTEM_HAS_INDEXDWORD}
{$define FPC_SYSTEM_HAS_SPTR}
Function Sptr : Pointer;assembler;nostackframe;
asm