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+ added asm optimized implementations of StrLower() and StrUpper() for i8086

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git-svn-id: trunk@37618 -
This commit is contained in:
nickysn 2017-11-24 16:11:18 +00:00
parent 51489f9186
commit 44f04d39a4
1 changed files with 104 additions and 0 deletions
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104
rtl/i8086/strings.inc
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@ -76,3 +76,107 @@ asm
@@LStrEndNil:
end;
{$endif FPC_UNIT_HAS_STREND}
{$ifndef FPC_UNIT_HAS_STRUPPER}
{$define FPC_UNIT_HAS_STRUPPER}
function strupper(p : pchar) : pchar;assembler;nostackframe;
const
{$ifdef FPC_X86_CODE_FAR}
extra_param_offset = 2;
{$else FPC_X86_CODE_FAR}
extra_param_offset = 0;
{$endif FPC_X86_CODE_FAR}
asm
mov bx, sp
xor ax, ax
{$ifdef FPC_X86_DATA_NEAR}
mov dx, ds
mov es, dx
mov di, ss:[bx + 2 + extra_param_offset] // @p
or di, di
jz @@LStrUpperNil
{$else FPC_X86_DATA_NEAR}
les di, ss:[bx + 2 + extra_param_offset] // @p
mov dx, es
mov cx, dx
or cx, di
jz @@LStrUpperNil
mov cx, ds
mov ds, dx
{$endif FPC_X86_DATA_NEAR}
mov si, di
mov bx, di
{$ifdef FPC_ENABLED_CLD}
cld
{$endif FPC_ENABLED_CLD}
@@LSTRUPPER1:
lodsb
cmp al, 'a'
jb @@LSTRUPPER3
cmp al, 'z'
ja @@LSTRUPPER3
sub al, 20h
@@LSTRUPPER3:
stosb
or al, al
jnz @@LSTRUPPER1
xchg ax, bx { 1 byte shorter than a mov }
{$ifndef FPC_X86_DATA_NEAR}
mov ds, cx
{$endif not FPC_X86_DATA_NEAR}
@@LStrUpperNil:
end;
{$endif FPC_UNIT_HAS_STRUPPER}
{$ifndef FPC_UNIT_HAS_STRLOWER}
{$define FPC_UNIT_HAS_STRLOWER}
function strlower(p : pchar) : pchar;assembler;nostackframe;
const
{$ifdef FPC_X86_CODE_FAR}
extra_param_offset = 2;
{$else FPC_X86_CODE_FAR}
extra_param_offset = 0;
{$endif FPC_X86_CODE_FAR}
asm
mov bx, sp
xor ax, ax
{$ifdef FPC_X86_DATA_NEAR}
mov dx, ds
mov es, dx
mov di, ss:[bx + 2 + extra_param_offset] // @p
or di, di
jz @@LStrLowerNil
{$else FPC_X86_DATA_NEAR}
les di, ss:[bx + 2 + extra_param_offset] // @p
mov dx, es
mov cx, dx
or cx, di
jz @@LStrLowerNil
mov cx, ds
mov ds, dx
{$endif FPC_X86_DATA_NEAR}
mov si, di
mov bx, di
{$ifdef FPC_ENABLED_CLD}
cld
{$endif FPC_ENABLED_CLD}
@@LSTRLOWER1:
lodsb
cmp al, 'A'
jb @@LSTRLOWER3
cmp al, 'Z'
ja @@LSTRLOWER3
add al, 20h
@@LSTRLOWER3:
stosb
or al, al
jnz @@LSTRLOWER1
xchg ax, bx { 1 byte shorter than a mov }
{$ifndef FPC_X86_DATA_NEAR}
mov ds, cx
{$endif not FPC_X86_DATA_NEAR}
@@LStrLowerNil:
end;
{$endif FPC_UNIT_HAS_STRLOWER}