While both the .repeat - .until macro and the .while - .endw macro work correctly, they both must use a register where the .IF macro will accept 2 memory operands which is often simpler in higher level code. For the price of nominating a normal label, the .IF macro is simpler to use and more flexible in how you can use it. Examples below.
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include \masm32\include64\masm64rt.inc
.code
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entry_point proc
USING r12
LOCAL var1 :QWORD
LOCAL var2 :QWORD
SaveRegs
; -------------------------------------
mov var1, 1
mov var2, 5
lbl1:
conout str$(var1),lf
add var1, 1
.IF var1 le var2 goto lbl1 ; eval last
conout lf
; -------------------------------------
mov var1, 1
mov var2, 5
lbl2:
.IF var1 gt var2 goto lbl3 ; eval first
conout str$(var1),lf
add var1, 1
jmp lbl2
lbl3:
conout lf
; -------------------------------------
mov var1, 1
mov var2, 5
jmp lbl5 ; eval first by jmp to .IF
lbl4:
conout str$(var1),lf
add var1, 1
lbl5:
.IF var1 le var2 goto lbl4 ; eval at end
; -------------------------------------
waitkey
RestoreRegs
.exit
entry_point endp
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end
