From 44f04d39a41382cfd34688187bd1c680e3ea69db Mon Sep 17 00:00:00 2001
From: nickysn <nickysn@gmail.com>
Date: Fri, 24 Nov 2017 16:11:18 +0000
Subject: [PATCH] + added asm optimized implementations of StrLower() and
 StrUpper() for i8086

git-svn-id: trunk@37618 -
---
 rtl/i8086/strings.inc | 104 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)

diff --git a/rtl/i8086/strings.inc b/rtl/i8086/strings.inc
index b4d640abae..688a99cd71 100644
--- a/rtl/i8086/strings.inc
+++ b/rtl/i8086/strings.inc
@@ -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}