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Re: RFA: MN10300: Add jump label to Lcc insn


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On 09/06/11 07:01, Nick Clifton wrote:
> Hi Jeff, Hi Alex,
> 
> The MN10300 target is currently failing to build in the mainline FSF 
> sources because of this error when creating libgcc:
> 
> gcc/libgcc2.c: In function '__popcountsi2': gcc/libgcc2.c:834:1:
> internal compiler error: in create_trace_edges, at dwarf2cfi.c:2325
> 
> This turns out to be because the code in create_trace_edges does not 
> handle jumps inside parallel insns, like this:
> 
> (jump_insn 72 52 31 3 (parallel [ (set (pc) (if_then_else (ne (reg:CC
> 51 EPSW) (const_int 0 [0])) (label_ref 29) (pc))) (unspec [ 
> (const_int 1 [0x1]) ] 9) ]) gcc/libgcc2.c:830 -1 
> (insn_list:REG_LABEL_OPERAND 29 (nil)))
> 
> I am not sure if create_trace_edges should handle this, but I felt 
> that the easiest thing to do was to fix the MN10300 backend so that 
> when it was creating this insn, it would also set the label on the 
> parallel container.  That is what the patch below does and with this 
> applied I can build the toolchain again.
> 
> OK to apply, or is there a better way to fix the problem ?
> 
> Cheers Nick
> 
> gcc/ChangeLog 2011-09-06  Nick Clifton  <nickc@redhat.com>
> 
> * config/mn10300/mn10300.c (mn10300_insert_setlb_lcc): Set the jump
> label on the parallel part of the insn.
Normally the JUMP_LABEL is set by the generic parts of the compiler;
however, jumps created via the md_reorg hook need explicitly have their
JUMP_LABEL set by the backend.

OK.

jeff

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