FlexGui P2ASM Local Labels

MSwann

I'm using FlexGui with the __pasm directive to implement P2ASM.

__pasm {
     ...
}

Does FlexC allow local labels? I can't get it to work using either colon or dot notation.

ersmith

Yes, FlexC allows local labels, using whatever form (colon or dot) is appropriate for the processor being compiled for (colon for P1, dot for P2). For example:

#include <propeller2.h>

__pasm {
entry
    nop
.somelocal
    dirnot #56
    waitx ##20_000_000
    jmp #.somelocal
bar
}

int main () {

   _cognew(&entry, 0);
   for(;;)
       ;
   return(0);
} 

MSwann

Thanks @ersmith.

MSwann

@ersmith,

Now local labels don't work. I get the following messages.

"C:/tools/PropellerTools/flexgui/bin/fastspin" -2 -l -O1 -I "C:/Projects/Prop2Test/flexgui/include"  "C:/Projects/Prop2Posit/PositTest.c"
Propeller Spin/PASM Compiler 'FastSpin' (c) 2011-2019 Total Spectrum Software Inc.
Version 4.0.5 Compiled on: Dec 19 2019
PositTest.c
Posit32es2.p2asm:664: error: syntax error, unexpected constant
Posit32es2.p2asm:672: error: syntax error, unexpected '.'
Posit32es2.p2asm:676: error: syntax error, unexpected '.'
child process exited abnormally
Finished at Tue Jan 14 14:13:19 2020

Code follows:

659                     mov     temp1,#quire_msw
660                     sets    .0,temp1
661                     mov     cntr1,#16
662                     mov     k_expA,#271
663
664     .0              mov     frac64Ah,#0 wz
665             if_z    sub     temp1,#1
666             if_z    sets    .0,temp1
667             if_z    sub     k_expA,#32
668             if_z    djnz    cntr1,#.0
669
670                     ' Copy next 2 words to frac64A l and x
671
672                     sets    .A1,temp1
673                     sub     temp1,#1
674                     sets    .2,temp1
675
676     .A1             mov     frac64Al,frac64Al
677     .2              mov     frac64Ax,frac64Ax

ersmith

Ah, I see: it doesn't like ".0" and ".2" (it wants the local labels to start with a letter or underscore). Does PNut allow local labels to start with a digit? I'd kind of be surprised if it does, those look like floating point numbers, but I'll go along with whatever Chip does.

MSwann

ersmith wrote: »

Ah, I see: it doesn't like ".0" and ".2" (it wants the local labels to start with a letter or underscore). Does PNut allow local labels to start with a digit? I'd kind of be surprised if it does, those look like floating point numbers, but I'll go along with whatever Chip does.

I changed all labels to DOT-ALPHA. Here are the results

"C:/tools/PropellerTools/flexgui/bin/fastspin" -2 -l -O1 -I "C:/Projects/Prop2Test/flexgui/include"  "C:/Projects/Prop2Posit/PositTest.c"
Propeller Spin/PASM Compiler 'FastSpin' (c) 2011-2019 Total Spectrum Software Inc.
Version 4.0.5 Compiled on: Dec 19 2019
PositTest.c
Posit32es2.p2asm:660: error: syntax error, unexpected '.'
Posit32es2.p2asm:664: error: syntax error, unexpected '.'
Posit32es2.p2asm:666: error: syntax error, unexpected '.'
Posit32es2.p2asm:668: error: syntax error, unexpected '.'
Posit32es2.p2asm:672: error: syntax error, unexpected '.'
Posit32es2.p2asm:674: error: syntax error, unexpected '.'
child process exited abnormally
Finished at Tue Jan 14 14:47:03 2020

Code follows:

659                     mov     temp1,#quire_msw
660                     sets    .A,temp1
661                     mov     cntr1,#16
662                     mov     k_expA,#271
663
664     .A              mov     frac64Ah,#0 wz
665             if_z    sub     temp1,#1
666             if_z    sets    .A,temp1
667             if_z    sub     k_expA,#32
668             if_z    djnz    cntr1,#.A
669
670                     ' Copy next 2 words to frac64A l and x
671
672                     sets    .B,temp1
673                     sub     temp1,#1
674                     sets    .C,temp1
675
676     .B              mov     frac64Al,frac64Al
677     .C              mov     frac64Ax,frac64Ax

ersmith

Something weird is definitely going on, I was sure that I compiled and ran the program I posted earlier, but now I can't. I must have mixed up compiler versions or something. Sorry about that, I'll look into it. There must be a conflict between the C parser and the Spin parser in __pasm blocks.

ersmith

OK, the bug seems to be in handling any single character local label in C code in P2 mode; a little specific and I missed it. Basically local labels have to start with two letters or underscores to be properly recognized in fastspin 4.0.x. It'll be fixed in 4.1.0.