http://sourceware.org/bugzilla/show_bug.cgi?id=12494
Anitha Boyapati <anitha.boyapati at atmel dot com> changed:
What |Removed |Added
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--- Comment #4 from Anitha Boyapati <anitha.boyapati at atmel dot com>
2011-03-12 08:35:04 UTC ---
(In reply to comment #2)
> Created attachment 5249 [details]
> Disassembly
>
> The wrong relaxation optimization. Note that fa gets called no matter what
> value parameter x of fb has.
>
> Disassembly as of
> avr-objdump -z -h -S -j .data -j .text computed-goto.elf > computed-goto.lst
If label 'b' is not empty, I think this will not happen. I just tried a small
change. Lets say:
<code>
goto *l[x];
a:fa();
b: z--;
</code>
The code generated will be :
...
8e: 09 94 ijmp
90: e9 df rcall .-46 ; 0x64 <fa>
92: 80 91 64 00 lds r24, 0x0064
96: 81 50 subi r24, 0x01 ; 1
98: 80 93 64 00 sts 0x0064, r24
9c: 08 95 ret
...
(In reply to comment #1)
> Created attachment 5248 [details]
> .s as compiled by avr-gcc
>
> avr-gcc output according to GNU-C source
Also, I find it a little strange that 2 ret are emitted in fb()
ijmp
.L6:
rcall fa ;
ret
.L7:
ret
Although it does not make any semantic difference why 2 return statements?
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