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+ added an i8086 asm optimized implementation of fpc_pchar_length

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git-svn-id: trunk@32113 -
This commit is contained in:
nickysn 2015-10-21 13:21:04 +00:00
parent 35ff024f03
commit 3d2919acae
1 changed files with 32 additions and 0 deletions
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32
rtl/i8086/i8086.inc
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@ -432,6 +432,38 @@ end;
{$endif FPC_SYSTEM_HAS_COMPAREDWORD}
{$ifndef FPC_SYSTEM_HAS_FPC_PCHAR_LENGTH}
{$define FPC_SYSTEM_HAS_FPC_PCHAR_LENGTH}
function fpc_pchar_length(p:pchar):sizeint;assembler;nostackframe;[public,alias:'FPC_PCHAR_LENGTH']; compilerproc;
asm
mov bx, sp
{$ifdef FPC_X86_DATA_NEAR}
mov ax, ss:[bx + 2 + extra_param_offset] // p
test ax, ax
jz @@Done
xchg ax, di
mov ax, ds
mov es, ax
{$else FPC_X86_DATA_NEAR}
les di, ss:[bx + 2 + extra_param_offset] // p
mov ax, es
or ax, di
jz @@Done
{$endif FPC_X86_DATA_NEAR}
mov cx, 0FFFFh
xor ax, ax
{$ifdef FPC_ENABLED_CLD}
cld
{$endif FPC_ENABLED_CLD}
repne scasb
dec ax
dec ax
sub ax, cx
@@Done:
end;
{$endif FPC_SYSTEM_HAS_FPC_PCHAR_LENGTH}
{$define FPC_SYSTEM_HAS_SPTR}
Function Sptr : Pointer;assembler;nostackframe;
asm