diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/TargetLowering.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/TargetLowering.cpp | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp index 80191167b3..2db55d39f3 100644 --- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp +++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp @@ -2547,12 +2547,12 @@ static void ChooseConstraint(TargetLowering::AsmOperandInfo &OpInfo, unsigned BestIdx = 0; TargetLowering::ConstraintType BestType = TargetLowering::C_Unknown; int BestGenerality = -1; - + // Loop over the options, keeping track of the most general one. for (unsigned i = 0, e = OpInfo.Codes.size(); i != e; ++i) { TargetLowering::ConstraintType CType = TLI.getConstraintType(OpInfo.Codes[i]); - + // If this is an 'other' constraint, see if the operand is valid for it. // For example, on X86 we might have an 'rI' constraint. If the operand // is an integer in the range [0..31] we want to use I (saving a load @@ -2570,6 +2570,11 @@ static void ChooseConstraint(TargetLowering::AsmOperandInfo &OpInfo, } } + // Things with matching constraints can only be registers, per gcc + // documentation. This mainly affects "g" constraints. + if (CType == TargetLowering::C_Memory && OpInfo.hasMatchingInput()) + continue; + // This constraint letter is more general than the previous one, use it. int Generality = getConstraintGenerality(CType); if (Generality > BestGenerality) { |