From 20d4be151b54feb18aa1e5cc04033a4aa64137ae Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Thu, 1 Jul 2010 02:58:57 +0000 Subject: Enable on-demand fast-isel. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107377 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SelectionDAG/FastISel.cpp | 5 ++++- lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 6 ++++++ 2 files changed, 10 insertions(+), 1 deletion(-) (limited to 'lib/CodeGen') diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp index cc8c3c70ac..2d6b78840f 100644 --- a/lib/CodeGen/SelectionDAG/FastISel.cpp +++ b/lib/CodeGen/SelectionDAG/FastISel.cpp @@ -161,7 +161,10 @@ unsigned FastISel::materializeRegForValue(const Value *V, MVT VT) { } } } else if (const Operator *Op = dyn_cast(V)) { - if (!SelectOperator(Op, Op->getOpcode())) return 0; + if (!SelectOperator(Op, Op->getOpcode())) + if (!isa(Op) || + !TargetSelectInstruction(cast(Op))) + return 0; Reg = lookUpRegForValue(Op); } else if (isa(V)) { Reg = createResultReg(TLI.getRegClassFor(VT)); diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp index 3b0ef18dd8..0848e46c0e 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp @@ -709,6 +709,12 @@ void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) { FastIS->startNewBlock(BB); // Do FastISel on as many instructions as possible. for (; BI != End; ++BI) { + // Defer instructions with no side effects; they'll be emitted + // on-demand later. + if (BI->isSafeToSpeculativelyExecute() && + !FuncInfo->ValueMap.count(BI)) + continue; + // Try to select the instruction with FastISel. if (FastIS->SelectInstruction(BI)) continue; -- cgit v1.2.3-70-g09d2