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[ConstraintElimination] Tweak placement in pipeline.

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This patch adds the ConstraintElimination pass to the LTO pipeline and
also runs it after SCCP in the function simplification pipeline.

This increases the number of cases we can elimination. Pending further
tuning.
This commit is contained in:
Florian Hahn 2020-12-07 18:14:57 +00:00
parent e4e35775d8
commit 4b1d72bba8
1 changed files with 6 additions and 0 deletions
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6
lib/Transforms/IPO/PassManagerBuilder.cpp
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@ -470,6 +470,9 @@ void PassManagerBuilder::addFunctionSimplificationPasses(
MPM.add(createMemCpyOptPass()); // Remove memcpy / form memset
MPM.add(createSCCPPass()); // Constant prop with SCCP
if (EnableConstraintElimination)
MPM.add(createConstraintEliminationPass());
// Delete dead bit computations (instcombine runs after to fold away the dead
// computations, and then ADCE will run later to exploit any new DCE
// opportunities that creates).
@ -1056,6 +1059,9 @@ void PassManagerBuilder::addLTOOptimizationPasses(legacy::PassManagerBase &PM) {
if (EnableLoopInterchange)
PM.add(createLoopInterchangePass());
if (EnableConstraintElimination)
PM.add(createConstraintEliminationPass());
// Unroll small loops
PM.add(createSimpleLoopUnrollPass(OptLevel, DisableUnrollLoops,
ForgetAllSCEVInLoopUnroll));