From 63974b2144c87c962effdc0508c27643c8ad98b6 Mon Sep 17 00:00:00 2001 From: Chandler Carruth Date: Tue, 13 Dec 2011 01:56:10 +0000 Subject: Initial CodeGen support for CTTZ/CTLZ where a zero input produces an undefined result. This adds new ISD nodes for the new semantics, selecting them when the LLVM intrinsic indicates that the undef behavior is desired. The new nodes expand trivially to the old nodes, so targets don't actually need to do anything to support these new nodes besides indicating that they should be expanded. I've done this for all the operand types that I could figure out for all the targets. Owners of various targets, please review and let me know if any of these are incorrect. Note that the expand behavior is *conservatively correct*, and exactly matches LLVM's current behavior with these operations. Ideally this patch will not change behavior in any way. For example the regtest suite finds the exact same instruction sequences coming out of the code generator. That's why there are no new tests here -- all of this is being exercised by the existing test suite. Thanks to Duncan Sands for reviewing the various bits of this patch and helping me get the wrinkles ironed out with expanding for each target. Also thanks to Chris for clarifying through all the discussions that this is indeed the approach he was looking for. That said, there are likely still rough spots. Further review much appreciated. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146466 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/MBlaze/MBlazeISelLowering.cpp | 2 ++ 1 file changed, 2 insertions(+) (limited to 'lib/Target/MBlaze/MBlazeISelLowering.cpp') diff --git a/lib/Target/MBlaze/MBlazeISelLowering.cpp b/lib/Target/MBlaze/MBlazeISelLowering.cpp index 148d906a24..0002174f2b 100644 --- a/lib/Target/MBlaze/MBlazeISelLowering.cpp +++ b/lib/Target/MBlaze/MBlazeISelLowering.cpp @@ -167,7 +167,9 @@ MBlazeTargetLowering::MBlazeTargetLowering(MBlazeTargetMachine &TM) setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand); setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand); setOperationAction(ISD::CTLZ, MVT::i32, Expand); + setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32, Expand); setOperationAction(ISD::CTTZ, MVT::i32, Expand); + setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32, Expand); setOperationAction(ISD::CTPOP, MVT::i32, Expand); setOperationAction(ISD::BSWAP, MVT::i32, Expand); -- cgit v1.2.3