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[SYCL] Disable reassociate pass to reduce register pressure #3615

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Merged
merged 3 commits into from
Jun 24, 2021
Merged

[SYCL] Disable reassociate pass to reduce register pressure #3615

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90bd6e2
WIP: Disable reassociate pass to reduce register pressure
bader Apr 26, 2021
02eaa55
Merge remote-tracking branch 'intel/sycl' into disable-reassociate-pass
bader Jun 23, 2021
1d3720b
Fix formatting.
bader Jun 23, 2021
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5 changes: 4 additions & 1 deletion llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -435,7 +435,10 @@ void PassManagerBuilder::addFunctionSimplificationPasses(
if (OptLevel > 1)
MPM.add(createTailCallEliminationPass()); // Eliminate tail calls
MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
MPM.add(createReassociatePass()); // Reassociate expressions
// FIXME: re-association increases variables liveness and therefore register
// pressure.
if (!SYCLOptimizationMode)
MPM.add(createReassociatePass()); // Reassociate expressions

// Do not run loop pass pipeline in "SYCL Optimization Mode". Loop
// optimizations rely on TTI, which is not accurate for SPIR target.
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