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-rw-r--r--llvm/lib/Transforms/IPO/PassManagerBuilder.cpp8
1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
index 75714713172..fb56088d361 100644
--- a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -310,6 +310,10 @@ void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
if (!DisableUnrollLoops)
MPM.add(createLoopUnrollPass()); // Unroll small loops
+ // After vectorization and unrolling, assume intrinsics may tell us more
+ // about pointer alignments.
+ MPM.add(createAlignmentFromAssumptionsPass());
+
if (!DisableUnitAtATime) {
// FIXME: We shouldn't bother with this anymore.
MPM.add(createStripDeadPrototypesPass()); // Get rid of dead prototypes
@@ -399,6 +403,10 @@ void PassManagerBuilder::addLTOOptimizationPasses(PassManagerBase &PM) {
// More scalar chains could be vectorized due to more alias information
PM.add(createSLPVectorizerPass()); // Vectorize parallel scalar chains.
+ // After vectorization, assume intrinsics may tell us more about pointer
+ // alignments.
+ PM.add(createAlignmentFromAssumptionsPass());
+
if (LoadCombine)
PM.add(createLoadCombinePass());
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