[sdcc-devel] [ sdcc-Feature Requests-899102 ] Pretty unoptimized asm code

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Feature Requests item #899102, was opened at 2004-02-17 21:37
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https://sourceforge.net/tracker/?func=detail&atid=350599&aid=899102&group_id=599

Category: None
Group: None
Status: Open
Priority: 5
Submitted By: Mika Rasimus (rasimus)
Assigned to: Nobody/Anonymous (nobody)
Summary: Pretty unoptimized asm code

Initial Comment:
Very shortened example of my problem: "code char 
*text" -pointer converted to an "unsigned long" and 
passed as a parameter to an another function:

;text                      Allocated to registers r2 r3
;k                         Allocated to registers r5
;Interf.c:251: BYTE printT(code char *text)
... (here's some unincluded code)
00104$:
;Interf.c:257: k=lueFlaCode((LONG) text);
;     genIpush
	push	ar4
;     genCast
	mov	ar5,r2
	mov	ar6,r3
	mov	r7,#0x00
	mov	r4,#0x00
;     genCall
	mov	dpl,r5
	mov	dph,r6
	mov	b,r7
	mov	a,r4
	lcall	_lueFlaCode
	mov	r4,dpl
;     genAssign
	mov	ar5,r4

A lot of unnecessary movs that could be easily avoided 
if the optimizer would keep a track of where unchanged 
register values finally end up to. Please improve this part 
a bit.


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