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Diffstat (limited to 'src/passes/OptimizeInstructions.cpp')
| -rw-r--r-- | src/passes/OptimizeInstructions.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/passes/OptimizeInstructions.cpp b/src/passes/OptimizeInstructions.cpp index d1b419a06..c6006d712 100644 --- a/src/passes/OptimizeInstructions.cpp +++ b/src/passes/OptimizeInstructions.cpp @@ -517,6 +517,12 @@ struct OptimizeInstructions : public WalkerPass<PostWalker<OptimizeInstructions, } } } + // some operations have no effect TODO: many more + if (right->value == Literal(int32_t(0))) { + if (binary->op == ShlInt32 || binary->op == ShrUInt32 || binary->op == ShrSInt32) { + return binary->left; + } + } // the square of some operations can be merged if (auto* left = binary->left->dynCast<Binary>()) { if (left->op == binary->op) { |