Hi,
I am writing a (microsoft Intel P4) assembly program that copies a few floating point values from x to y and then bubble sorts the values (ascending) in y by using the FPU commands.
For some reason, one value is out of place. The value that should be in the first location is in the middle and the value that should be in the middle is in the first location. I have tried everything I can think of including sorting the values counting down from the last data location.
Here is the code: (also attached "sort.txt")
;;;;;;;;;;;;;;;;;;;;;;;;;
.model small
.586
.stack 100h
.data
x DD 23.5,99.5,44.5,67.25,11.25,78.5
y DD 6 DUP(?)
swap db ?
greater db ?
.code
begin:
.startup
CALL copy
MOV cx,5
nextR:
MOV byte ptr swap,0
PUSH cx
LEA Esi,y
nextC:
CALL compare
CMP byte ptr greater,1
JE doswap
JMP continue
doswap:
CALL exchange
continue:
ADD Esi,4
Loop nextC
CMP byte ptr swap,0
JE done
POP cx
Loop nextR
jmp done
copy proc
MOV Cx,6
LEA Esi,x
LEA Edi,y
small:
MOV Eax,
MOV , Eax
ADD Esi,4
ADD Edi,4
Loop small
RET
copy ENDP
compare proc
FLD dword ptr
FCOM dword ptr
FSTSW Ax
AND Ax,4500h
XOR Ax,0100h
MOV greater,Ah
RET
compare ENDP
exchange proc
MOV byte ptr swap,1
MOV Eax,
PUSH Eax
MOV Eax,
MOV ,Eax
POP Eax
MOV ,Eax
RET
exchange ENDP
done:
;;;;;;;;NEEDED IN ORDER TO GET THE SORTING FIXED;;;;;;;;;;;
LEA Esi,y
MOV Eax,
PUSH Eax
MOV Eax,
MOV ,Eax
POP Eax
MOV ,Eax
LEA Esi,y
MOV Eax,
PUSH Eax
MOV Eax,
MOV ,Eax
POP Eax
MOV ,Eax
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
.exit
end begin
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Can anyone help and tell me how to fix this?
Thanks,
E.D.1870
I am writing a (microsoft Intel P4) assembly program that copies a few floating point values from x to y and then bubble sorts the values (ascending) in y by using the FPU commands.
For some reason, one value is out of place. The value that should be in the first location is in the middle and the value that should be in the middle is in the first location. I have tried everything I can think of including sorting the values counting down from the last data location.
Here is the code: (also attached "sort.txt")
;;;;;;;;;;;;;;;;;;;;;;;;;
.model small
.586
.stack 100h
.data
x DD 23.5,99.5,44.5,67.25,11.25,78.5
y DD 6 DUP(?)
swap db ?
greater db ?
.code
begin:
.startup
CALL copy
MOV cx,5
nextR:
MOV byte ptr swap,0
PUSH cx
LEA Esi,y
nextC:
CALL compare
CMP byte ptr greater,1
JE doswap
JMP continue
doswap:
CALL exchange
continue:
ADD Esi,4
Loop nextC
CMP byte ptr swap,0
JE done
POP cx
Loop nextR
jmp done
copy proc
MOV Cx,6
LEA Esi,x
LEA Edi,y
small:
MOV Eax,
MOV , Eax
ADD Esi,4
ADD Edi,4
Loop small
RET
copy ENDP
compare proc
FLD dword ptr
FCOM dword ptr
FSTSW Ax
AND Ax,4500h
XOR Ax,0100h
MOV greater,Ah
RET
compare ENDP
exchange proc
MOV byte ptr swap,1
MOV Eax,
PUSH Eax
MOV Eax,
MOV ,Eax
POP Eax
MOV ,Eax
RET
exchange ENDP
done:
;;;;;;;;NEEDED IN ORDER TO GET THE SORTING FIXED;;;;;;;;;;;
LEA Esi,y
MOV Eax,
PUSH Eax
MOV Eax,
MOV ,Eax
POP Eax
MOV ,Eax
LEA Esi,y
MOV Eax,
PUSH Eax
MOV Eax,
MOV ,Eax
POP Eax
MOV ,Eax
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
.exit
end begin
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Can anyone help and tell me how to fix this?
Thanks,
E.D.1870
Make sure you can understand this - your
instructor might want you to explain it. ;)
instructor might want you to explain it. ;)
.data
fArray REAL4 2.5,1.4,1.7,-2.5,8.0,9.2,0.6,0.0
.code
mov ecx, LENGTHOF fArray
mov edi, OFFSET fArray
; ecx = count to sort
; edi = array address
outerloop:
mov edx,ecx
fld REAL4 PTR [edi]
jmp order_ok
innerloop:
fcom REAL4 PTR [edi+edx*4]
fstsw ax
test ax,4100h
jne order_ok
fld REAL4 PTR [edi+edx*4]
fxch
fstp REAL4 PTR [edi+edx*4]
order_ok:
dec edx
jne innerloop
fstp REAL4 PTR [edi]
add edi,4
dec ecx
jne outerloopThanks alot.
E.D.1870
E.D.1870