[llvm] r257477 - Register Data Flow: data flow graph

[Hans Wennborg via llvm-commits]

On Tue, Jan 12, 2016 at 7:09 AM, Krzysztof Parzyszek via llvm-commits
<llvm-commits at lists.llvm.org> wrote:
> Author: kparzysz
> Date: Tue Jan 12 09:09:49 2016
> New Revision: 257477
>
> URL: http://llvm.org/viewvc/llvm-project?rev=257477&view=rev
> Log:
> Register Data Flow: data flow graph
>
> Target independent, SSA-based data flow framework for representing
> data flow between physical registers.
>
> This commit implements the creation of the actual data flow graph.

[...]

> +// Move the stack iterator up by one.
> +unsigned DataFlowGraph::DefStack::nextUp(unsigned P) const {
> +  // Get the next valid position after P (skipping all delimiters).
> +  // The input position P does not have to point to a non-delimiter.
> +  unsigned SS = Stack.size();
> +  bool IsDelim;
> +  assert(P >= 0 && P < SS);

I get a warning about this:

../lib/Target/Hexagon/RDFGraph.cpp:792:15: warning: comparison of
unsigned expression >= 0 is always true [-Wtype-limits]
   assert(P >= 0 && P < SS);
               ^