From d9189891fc8fb21b9513aaf1f56cae0c75e33bd8 Mon Sep 17 00:00:00 2001 From: Simon Pilgrim Date: Fri, 28 Oct 2016 14:07:44 +0000 Subject: [PATCH] [SelectionDAG] computeKnownBits - early-out if any BUILD_VECTOR element has no known bits No need to check the remaining elements - no common known bits are available. llvm-svn: 285399 --- llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index e6b8d2f5ade4..db6accfb628c 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -2042,6 +2042,10 @@ void SelectionDAG::computeKnownBits(SDValue Op, APInt &KnownZero, // TODO: support per-element known bits. KnownOne &= KnownOne2; KnownZero &= KnownZero2; + + // If we don't know any bits, early out. + if (!KnownOne && !KnownZero) + break; } break; case ISD::AND: -- 2.34.1