PowerPC shrink-wrap support 3 of 3

[Bernd Schmidt]

On 09/27/11 00:32, Alan Modra wrote:
> On Mon, Sep 26, 2011 at 11:22:54PM +0930, Alan Modra wrote:
>> Two regressions appeared due to a problem in the shrink-wrap code.
> 
> These two.
> +FAIL: g++.dg/torture/pr46111.C  -O1  (internal compiler error)
> +FAIL: gcc.dg/autopar/pr46099.c (internal compiler error)
> 
> Both "internal compiler error: in maybe_record_trace_start, at
> dwarf2cfi.c:2243", caused by disjoint blocks in the set of blocks that
> needs no prologue.  ie. thread_prologue_and_epilogue_insns gives
> 
> ====
> code needing no prologue
> ====  <- prologue inserted here
> code needing prologue
> ====
> more no prologue code
> ====
> more code needing prologue
> ====
> epilogue
> 
> That second block needing no prologue now wrongly tries to use unwind
> info from the prologue.

What's the actual CFG structure here?


Bernd