Re: possible bug in gcc

[Derek Godfrey <derek0godfrey%netscape.net@localhost>]

humm I don't see whats wrong. The routine does nothing, or are you
saying it should produce nothing at all :-). a blr, well show us where 
it gets
called - it might replace the call just the side effect.  better yet 
make it do something.

erik.anggard%packetfront.com@localhost wrote:

> Hi,
>
> I'd like to know if it is only my gcc that has been messed up somehow 
> or if anyone else running NetBSD on a powerpc arch (I'm running 1.6D 
> macppc) can reproduce this bug as shown below. Note: the 
> dummy-function used below is of course pretty useless but I'd still 
> like gcc to produce at least an blr-instruction at the end. If I 
> remove any of the case-blocks or if I use -O0 or -O1 gcc will produce 
> correct code. Very strange. (I've also tried the procedure below on an 
> i386 machine and there gcc produced correct code with -O2, that's why 
> I posted this question on port-powerpc).
>
> Thanks,
> Erik
>
> $ cc -v
> Using builtin specs.
> gcc version 2.95.3 20010315 (release) (NetBSD nb3)
> $ cat > dummy.c
> void
> dummy(int i)
> {
>        int n;
>
>        switch (i) {
>        case 0:
>                n = 0;
>                break;
>        case 1:
>                n = 1;
>                break;
>        case 2:
>                n = 2;
>                break;
>        case 3:
>                n = 3;
>                break;
>        case 4:
>                n = 4;
>                break;
>        }
> }
> ^d
> $ cc -O2 -c dummy.c
> $ objdump -D dummy.o
>
> dummy.o:     file format elf32-powerpc
>
> Disassembly of section .text:
>
> 00000000 <dummy>:
>   0:   28 03 00 04     cmplwi  r3,4
> Disassembly of section .data:
> $

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