[llvm-dev] DebugCounter and traps
David Greene via llvm-dev
llvm-dev at lists.llvm.org
Mon Sep 24 12:06:57 PDT 2018
David Greene via llvm-dev <llvm-dev at lists.llvm.org> writes:
> I needed to see what queryAliasing was doing on the "bad"
> transformation. Unfortunately, DebugCounter has no way to test the
> state of the counter without incrementing it, so I couldn't set a
> conditional breakpoint on the call to queryAliasing. And conditional
> breakpoints are really slow anyway.
Let me correct that. It's certainly possible to check the value in a
debugger without incrementing the counter. But conditional breakpoints
It's not possible to *programmatically* check the state of the counter
without changing it, which means one has to do some gymnastics to
remember the counter's value, as the "alternative" example demonstrates.
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