diff options
| author | Dan Gohman <gohman@apple.com> | 2008-10-03 01:28:47 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2008-10-03 01:28:47 +0000 |
| commit | 91b6f97ce4273fee5516692e3f27cd76d67986fc (patch) | |
| tree | a6b6fe168ef431f5887d1a097d9c6e49ae3bdd7e /lib/CodeGen/SelectionDAG/FastISel.cpp | |
| parent | 4e6ed5eefd578db5bff172298d7ff7d7eb69b947 (diff) | |
Implement fast-isel support for zero-extending from i1.
It turns out that this is a fairly common operation,
and it's easy enough to handle.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56990 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/FastISel.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/FastISel.cpp | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp index c0e8418c4c..17b37a3445 100644 --- a/lib/CodeGen/SelectionDAG/FastISel.cpp +++ b/lib/CodeGen/SelectionDAG/FastISel.cpp @@ -386,10 +386,21 @@ bool FastISel::SelectCast(User *I, ISD::NodeType Opcode) { if (SrcVT == MVT::Other || !SrcVT.isSimple() || DstVT == MVT::Other || !DstVT.isSimple() || - !TLI.isTypeLegal(SrcVT) || !TLI.isTypeLegal(DstVT)) + !TLI.isTypeLegal(DstVT)) // Unhandled type. Halt "fast" selection and bail. return false; + // Check if the source operand is legal. Or as a special case, + // it may be i1 if we're doing zero-extension because that's + // trivially easy and somewhat common. + if (!TLI.isTypeLegal(SrcVT)) { + if (SrcVT == MVT::i1 && Opcode == ISD::ZERO_EXTEND) + SrcVT = TLI.getTypeToTransformTo(SrcVT); + else + // Unhandled type. Halt "fast" selection and bail. + return false; + } + unsigned InputReg = getRegForValue(I->getOperand(0)); if (!InputReg) // Unhandled operand. Halt "fast" selection and bail. |