RE: [Sdcc-user] How to prevent DSEG from expanding over ISEG?

[Sandeep D. <sa...@dd...>]

Hello Dai Yuwen

Try compiling with --noloopinvariant & --noloop-induction
options these typically increase the spils, Will shortly provide
options to disable optimizations selectively. Also will provide
infrastructure to reduce spills automatically.

This is becoming more more of a serious issue as people
try to compile larger & larger programs.

Regards
Sandeep

-----Original Message-----
From: sdc...@li...
[mailto:sdc...@li...]On Behalf Of Dai Yuwen
Sent: Tuesday, August 22, 2000 3:58 AM
To: sdc...@li...
Subject: [Sdcc-user] How to prevent DSEG from expanding over ISEG?


Hi,

I use SDCC to compile a large program.  There're so many local variables
located in the DSEG that some of them have addresses large than 0x80
which is the start address of ISEG.  Then the generated asm code may be
invalid:

mov local, A

where local is namely in DSEG and its address is 0xD8.  However, we know
that direct memory address above 0x80 is invalid in 8051.

In order to force SDCC to put local variables in XSEG, I used the
"module-large" option. But in vain.  DSEG still expanded over ISEG.

Some one can help? Thanks in advance.

Dai Yuwen


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