From 59ecaae7b61ef0023ed1db4643937f7a57f61d10 Mon Sep 17 00:00:00 2001 From: Jakob Stoklund Olesen Date: Fri, 6 Jan 2012 21:40:15 +0000 Subject: [PATCH] Abort AdjustBBOffsetsAfter early when possible. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147685 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/ARM/ARMConstantIslandPass.cpp | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/lib/Target/ARM/ARMConstantIslandPass.cpp b/lib/Target/ARM/ARMConstantIslandPass.cpp index 2a7721bc74c..b73acd184c6 100644 --- a/lib/Target/ARM/ARMConstantIslandPass.cpp +++ b/lib/Target/ARM/ARMConstantIslandPass.cpp @@ -1035,14 +1035,22 @@ static bool BBIsJumpedOver(MachineBasicBlock *MBB) { #endif // NDEBUG void ARMConstantIslands::AdjustBBOffsetsAfter(MachineBasicBlock *BB) { - for(unsigned i = BB->getNumber() + 1, e = MF->getNumBlockIDs(); i < e; ++i) { + unsigned BBNum = BB->getNumber(); + for(unsigned i = BBNum + 1, e = MF->getNumBlockIDs(); i < e; ++i) { // Get the offset and known bits at the end of the layout predecessor. // Include the alignment of the current block. unsigned LogAlign = MF->getBlockNumbered(i)->getAlignment(); unsigned Offset = BBInfo[i - 1].postOffset(LogAlign); unsigned KnownBits = BBInfo[i - 1].postKnownBits(LogAlign); - // This is where block i begins. + // This is where block i begins. Stop if the offset is already correct, + // and we have updated 2 blocks. This is the maximum number of blocks + // changed before calling this function. + if (i > BBNum + 2 && + BBInfo[i].Offset == Offset && + BBInfo[i].KnownBits == KnownBits) + break; + BBInfo[i].Offset = Offset; BBInfo[i].KnownBits = KnownBits; } -- 2.34.1