Changeset 75129 in vbox for trunk/src/VBox/Runtime/common/string/watcom/memcmp.asm

Timestamp:

Oct 28, 2018 5:00:27 PM (6 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

126206

Message:

IPRT: Make Watcom C an alterntive for compiling the OS/2 kernel code (GA mainly), governed by VBOX_USE_WATCOM_FOR_OS2.

Location:

trunk/src/VBox/Runtime/common/string/watcom

Files:

• . (added)
• memcmp.asm (copied) (copied from trunk/src/VBox/Runtime/common/string/memcmp.asm ) (2 diffs)

trunk/src/VBox/Runtime/common/string/watcom/memcmp.asm

@@ -1 +1 @@
 ; $Id$
 ;; @file
-; IPRT - No-CRT memcmp - AMD64 & X86.
+; IPRT - No-CRT memcmp - Watcom register calling convention.
 ;
 
@@ -27 +27 @@
 %include "iprt/asmdefs.mac"
 
-BEGINCODE
+%define ASM_CALL32_WATCOM
+%define NAME(name) name %+ _
+%include "common/string/memcmp.asm"
 
-;;
-; @param    pv1     gcc: rdi  msc: rcx  x86:[esp+4]
-; @param    pv2     gcc: rsi  msc: rdx  x86:[esp+8]
-; @param    cb      gcc: rdx  msc: r8   x86:[esp+0ch]
-RT_NOCRT_BEGINPROC memcmp
-        cld
-        xor     eax, eax
-
-        ; Do the bulk of the work.
-%ifdef RT_ARCH_AMD64
- %ifdef ASM_CALL64_MSC
-        mov     r10, rdi                ; save
-        mov     r11, rsi                ; save
-        mov     rdi, rcx
-        mov     rsi, rdx
-        mov     rcx, r8
-        mov     rdx, r8
- %else
-        mov     rcx, rdx
- %endif
-        shr     rcx, 3
-        repe cmpsq
-        jne     .not_equal_qword
-%else
-        push    edi
-        push    esi
-
-        mov     ecx, [esp + 0ch + 8]
-        mov     edi, [esp + 04h + 8]
-        mov     esi, [esp + 08h + 8]
-        mov     edx, ecx
-        jecxz   .done
-        shr     ecx, 2
-        repe cmpsd
-        jne     .not_equal_dword
-%endif
-
-        ; The remaining bytes.
-%ifdef RT_ARCH_AMD64
-        test    dl, 4
-        jz      .dont_cmp_dword
-        cmpsd
-        jne     .not_equal_dword
-%endif
-.dont_cmp_dword:
-        test    dl, 2
-        jz      .dont_cmp_word
-        cmpsw
-        jne     .not_equal_word
-.dont_cmp_word:
-        test    dl, 1
-        jz      .dont_cmp_byte
-        cmpsb
-        jne     .not_equal_byte
-.dont_cmp_byte:
-
-.done:
-%ifdef RT_ARCH_AMD64
- %ifdef ASM_CALL64_MSC
-        mov     rdi, r10
-        mov     rsi, r11
- %endif
-%else
-        pop     esi
-        pop     edi
-%endif
-        ret
-
-;
-; Mismatches.
-;
-%ifdef RT_ARCH_AMD64
-.not_equal_qword:
-        mov     ecx, 8
-        sub     rsi, 8
-        sub     rdi, 8
-        repe cmpsb
-.not_equal_byte:
-        mov     al, [xDI-1]
-        movzx   ecx, byte [xSI-1]
-        sub     eax, ecx
-        jmp     .done
-%endif
-
-.not_equal_dword:
-        mov     ecx, 4
-        sub     xSI, 4
-        sub     xDI, 4
-        repe cmpsb
-%ifdef RT_ARCH_AMD64
-        jmp     .not_equal_byte
-%else
-.not_equal_byte:
-        mov     al, [xDI-1]
-        movzx   ecx, byte [xSI-1]
-        sub     eax, ecx
-        jmp     .done
-%endif
-
-.not_equal_word:
-        mov     ecx, 2
-        sub     xSI, 2
-        sub     xDI, 2
-        repe cmpsb
-        jmp     .not_equal_byte
-ENDPROC RT_NOCRT(memcmp)
-