OS_Develop/dos_compilers
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performance

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This commit is contained in:
davidly 2024-07-24 22:01:59 -07:00
parent 1b9b8b0959
commit 209e766086
2 changed files with 20 additions and 24 deletions
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22
Borland Turbo Assembler v32/SIEVE.ASM
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@ -49,40 +49,38 @@ false equ 0
loops equ 10
arraysize equ 8190
tttdataseg segment para public 'sievedata'
assume ds: tttdataseg
sieve_dataseg segment para public 'sievedata'
assume ds: sieve_dataseg
crlfmsg db 13,10,0
primesmsg db ' primes.',13,10,0
count dw 0
ITER dw 0
PKFLAGS dd 0
align 16
flags db arraysize + 1 dup( ? )
afterflags db 0
tttdataseg ends
sieve_dataseg ends
.code
start:
mov ax, tttdataseg
mov ax, sieve_dataseg
mov ds, ax
iteragain: ; for ( iter = 1; iter <= 10; iter++ )
mov word ptr [ count ], 0 ; count = 0
xor dx, dx ; count of primes found
; set all array entries to true: for (i = 0; i <= SIZE; i++) flags[i] = TRUE;
mov ah, true
mov al, true
mov di, offset flags
mov cx, ( arraysize + 2 ) / 2 ; 4095
mov cx, ( arraysize + 2 ) / 2 ; 4096
push ds
pop es
cld
rep stosw
stosb
; iterate through array entries and count primes
@ -105,25 +103,25 @@ start:
jge inccount ; redundant check to the one in the loop below but it saves a jump instruction in the loop
kloop:
mov byte ptr [ si ], cl ; flags[ k ] = false. use cl for 0 because it's faster than an immediate
mov [ si ], cl ; flags[ k ] = false. use cl for 0 because it's faster than an immediate
add si, ax ; k += prime
cmp si, di ; is si >= offset afterFlags? (i.e. k <= size)
jl kloop
inccount:
inc word ptr [ COUNT ] ; count++
inc dx ; count++
flagisoff: ; check if outer loop is done
inc bx
cmp bx, arraysize + 1
jnz nextprime
checknextiter: ; are we done iterating loops times?
checknextiter: ; are we done iterating loops times?
inc word ptr [ ITER ]
cmp word ptr [ ITER ], loops
jnz iteragain
mov ax, word ptr [COUNT]
mov ax, dx
call printint
call printcrlf

22
Microsoft MASM v5/SIEVE.ASM
View File

@ -49,40 +49,38 @@ false equ 0
loops equ 10
arraysize equ 8190
tttdataseg segment para public 'sievedata'
assume ds: tttdataseg
sieve_dataseg segment para public 'sievedata'
assume ds: sieve_dataseg
crlfmsg db 13,10,0
primesmsg db ' primes.',13,10,0
count dw 0
ITER dw 0
PKFLAGS dd 0
align 16
flags db arraysize + 1 dup( ? )
afterflags db 0
tttdataseg ends
sieve_dataseg ends
.code
start:
mov ax, tttdataseg
mov ax, sieve_dataseg
mov ds, ax
iteragain: ; for ( iter = 1; iter <= 10; iter++ )
mov word ptr [ count ], 0 ; count = 0
xor dx, dx ; count of primes found
; set all array entries to true: for (i = 0; i <= SIZE; i++) flags[i] = TRUE;
mov ah, true
mov al, true
mov di, offset flags
mov cx, ( arraysize + 2 ) / 2 ; 4095
mov cx, ( arraysize + 2 ) / 2 ; 4096
push ds
pop es
cld
rep stosw
stosb
; iterate through array entries and count primes
@ -105,25 +103,25 @@ start:
jge inccount ; redundant check to the one in the loop below but it saves a jump instruction in the loop
kloop:
mov byte ptr [ si ], cl ; flags[ k ] = false. use cl for 0 because it's faster than an immediate
mov [ si ], cl ; flags[ k ] = false. use cl for 0 because it's faster than an immediate
add si, ax ; k += prime
cmp si, di ; is si >= offset afterFlags? (i.e. k <= size)
jl kloop
inccount:
inc word ptr [ COUNT ] ; count++
inc dx ; count++
flagisoff: ; check if outer loop is done
inc bx
cmp bx, arraysize + 1
jnz nextprime
checknextiter: ; are we done iterating loops times?
checknextiter: ; are we done iterating loops times?
inc word ptr [ ITER ]
cmp word ptr [ ITER ], loops
jnz iteragain
mov ax, word ptr [COUNT]
mov ax, dx
call printint
call printcrlf