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Summary: This patch teaches InstCombine to accept a new parameter: maximum number of iterations over functions. InstCombine tries to simplify instructions by iterating over the whole function until the function stops changing. As a consequence, the last iteration before reaching a fixpoint visits all instructions in the worklist and never performs any rewrites. Bounding the number of iterations can have 2 benefits: * In case the users of the pass can make a good guess about the number of required iterations, we can save the time normally spent on the last iteration that doesn't change anything. * When the wants to use InstCombine as a cleanup pass, it may be enough to run just a few iterations and stop even before reaching a fixpoint. This can be also useful for implementing a lightweight pass pipeline (think `-O1`). This patch does not change the behavior of opt or Clang -- limiting the number of iterations is entirely opt-in. Reviewers: fhahn, davide, spatel, foad, nlopes, grosser, lebedev.ri, nikic, xbolva00 Reviewed By: spatel Subscribers: craig.topper, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D71145 |
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| .. | ||
| AggressiveInstCombine | ||
| InstCombine | ||
| Instrumentation | ||
| IPO | ||
| Scalar | ||
| Utils | ||
| Vectorize | ||
| CFGuard.h | ||
| Coroutines.h | ||
| Instrumentation.h | ||
| IPO.h | ||
| ObjCARC.h | ||
| Scalar.h | ||
| Utils.h | ||
| Vectorize.h | ||