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CMake Projects, temp disabled MMX line blit.

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This commit is contained in:
Justin Marshall
2020-06-10 13:34:18 -07:00
parent baeaf6c807
commit 45bcd847f9
12 changed files with 706 additions and 4668 deletions
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REDALERT/MMX.ASM
-30
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@@ -278,40 +278,10 @@ MMX_Single_Line_Trans proc near
;
; If we are doing less than 8 bytes then dont use MMX
;
cmp ecx,8
jge @@mmx_loop
push offset Single_Line_Trans_Entry
ret
;
; Use MMX instructions to mask 8 bytes at once
;
; Creates a bitmask based on the source bytes equality with zero and then uses this to mask
; out the source bytes in the destination data. The advatage that MMX gives us is that there is
; no 'test for zero then jump' required to mask.
;
align 64 ;MMX instructions like 64 byte alignment!
@@mmx_loop:
movq mm0,[esi] ; move 8 bytes of source into mm0
pxor mm1,mm1 ; zero out mm1
pcmpeqb mm1,mm0 ; compare mm0 with 0. Bits get set in mm1
lea esi,[esi+8] ; adjust the source data pointer
pand mm1,[edi] ; and in the destination data to throw away the bytes which arent zero in the source
sub ecx,8 ; adjust the byte counter
por mm1,mm0 ; or in the source with the destination data
movq [edi],mm1 ; write back the destination data
lea edi,[edi+8] ; adjust the destination pointer
cmp ecx,8
jg @@mmx_loop
;
; Jump to the approprite code for drawing the end of this line or going to the next one
;
push offset Next_Line
jcxz @@next_line
push offset Single_Line_Trans_Entry
@@next_line: ret