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Inline Assembly Code Question
Posted: Thu Aug 06, 2009 3:44 pm
by Logman
I have successfully run Direct to Compiler code using the "!" symbol, but am having trouble converting it to Inline ASM code.
Here's some sample code; I've stripped out everything to make it simple. Specifically, I'm having trouble with the LABEL l_L1: and with the LOOP statement that loops back to the LABEL l_L1. Everything else works, it just seems that I'm not implementing the LABEL and LOOP to the LABEL correctly in my procedure below--I keep getting a compiler error stating that l_L1 is not defined or is unrecognized:
Code: Select all
EnableASM
OpenConsole()
Global a.l = 0
Global c.l = 100
; Example inline ASM code
Procedure myInlineProc()
MOV Eax, [v_a] ; put contents of memory location [v_a] into eax register
MOV Ecx, [v_c] ; put contents of memory location [v_c] into ecx register
l_L1:
INC Eax ; add 1 to global variable eax register
LOOP l_L1
ProcedureReturn
EndProcedure
; Use myInlineProc
variable1.l = myInlineProc()
PrintN("Contents of EAX register = " + Str(variable1))
; Exit program
Print("Press [ENTER] to exit... ")
Input()
CloseConsole()
End
Can someone familiar with Inline ASM code help me with the LABEL error? Although ! l_L1: and ! LOOP l_L1 work when coding directly to the FASM compiler, LABELS and LOOPS may not work for Inline ASM. I'm not sure.
Thanks in advanced.
Logman
Posted: Thu Aug 06, 2009 4:25 pm
by mk-soft
Is a bug with EnableASM and labels
Code: Select all
EnableASM
OpenConsole()
Global a.l = 0
Global c.l = 100
; Example inline ASM code
Procedure myInlineProc()
MOV Eax, [v_a] ; put contents of memory location [v_a] into eax register
MOV Ecx, [v_c] ; put contents of memory location [v_c] into ecx register
!l_L1: ; Explizit ASM "!"
INC Eax ; add 1 to global variable eax register
LOOP l_L1
ProcedureReturn
EndProcedure
; Use myInlineProc
variable1.l = myInlineProc()
PrintN("Contents of EAX register = " + Str(variable1))
; Exit program
Print("Press [ENTER] to exit... ")
Input()
CloseConsole()
End
RE: Inline Assembly Question
Posted: Thu Aug 06, 2009 5:36 pm
by Logman
Thanks mk-soft.
I didn't think to mix direct instructions with inline instructions. That opens all new possibilities too because it works.
Logman
Posted: Sat Aug 08, 2009 10:12 am
by Trond
Code: Select all
Procedure myInlineProc()
MOV Eax, [v_a] ; put contents of memory location [v_a] into eax register
MOV Ecx, [v_c] ; put contents of memory location [v_c] into ecx register
L1: ; THIS LINE IS NOT INLINE ASM, IT IS NORMAL PB CODE
INC Eax ; add 1 to global variable eax register
LOOP l_L1
ProcedureReturn
EndProcedure
Don't add l_ to label definitions, the compiler adds it for you. You only add l_ when use the label from asm.
Posted: Sat Aug 08, 2009 10:48 am
by blueznl
Posted: Sun Aug 09, 2009 11:16 am
by Fzarada
Quote from PB reference manual:
When you reference a label, you must put the prefix 'l_' before the name. This is because PureBasic add a 'l_' before a BASIC label to avoid conflit with internal labels. The label need to be referenced in lowercase when using the inlined ASM.
RE: Inline Assembly Question
Posted: Tue Aug 11, 2009 6:53 pm
by Logman
Thanks Trond:
I didn't catch the part about "When you
REFERENCE a label, you must put the prefix..." in the manual. Didn't realize I was referencing a PB label.
I changed the LOOP statement in the code below. The manual states that you have to prefix labels using l_ when referencing them and you must reference labels using lowercase when using inline ASM.
Code: Select all
Procedure myInlineProc()
MOV Eax, [v_a] ; put contents of memory location [v_a] into eax register
MOV Ecx, [v_c] ; put contents of memory location [v_c] into ecx register
L1: ; THIS LINE IS NOT INLINE ASM, IT IS NORMAL PB CODE
INC Eax ; add 1 to global variable eax register
LOOP l_l1 ; label needs to be referenced in lowercase using inline
ProcedureReturn
EndProcedure
Don't add l_ to label definitions, the compiler adds it for you. You only add l_ when use the label from asm.
Logman
