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Re: How to debug ssa optimizer

From: Daniel Berlin <dberlin at dberlin dot org>
To: kenner at vlsi1 dot ultra dot nyu dot edu (Richard Kenner)
Cc: gcc at gcc dot gnu dot org
Date: Sat, 19 Jun 2004 21:51:35 -0400
Subject: Re: How to debug ssa optimizer
References: <10406200145.AA17580@vlsi1.ultra.nyu.edu>

On Jun 19, 2004, at 9:45 PM, Richard Kenner wrote:

If I have an RTL dump and I want to understand how an insn was changed
from one pass to another, I can look at the INSN_UID in the dump and
set conditional breakpoints for that insn.

If I see a statement change between two *.txx dumps, what is the
analogous mechanism for making a conditional breakpoint to look at
that statement?

If it's not a new statement being added, and just an existing statement being modified, you can conditional breakpoint modify_stmt with that statement address. That will catch every time it gets marked as modified.

--Dan

References:
- How to debug ssa optimizer
  - From: Richard Kenner

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