diff options
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp index e159c11..96dde98 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp @@ -3735,9 +3735,19 @@ void SelectionDAGLowering::visitInlineAsm(CallSite CS) { SawEarlyClobber |= OpInfo.isEarlyClobber; // If we see a clobber of a register, it is an early clobber. - if (OpInfo.Type == InlineAsm::isClobber && - OpInfo.ConstraintType == TargetLowering::C_Register) - SawEarlyClobber = true; + if (!SawEarlyClobber && + OpInfo.Type == InlineAsm::isClobber && + OpInfo.ConstraintType == TargetLowering::C_Register) { + // Note that we want to ignore things that we don't trick here, like + // dirflag, fpsr, flags, etc. + std::pair<unsigned, const TargetRegisterClass*> PhysReg = + TLI.getRegForInlineAsmConstraint(OpInfo.ConstraintCode, + OpInfo.ConstraintVT); + if (PhysReg.first || PhysReg.second) { + // This is a register we know of. + SawEarlyClobber = true; + } + } // If this is a memory input, and if the operand is not indirect, do what we // need to to provide an address for the memory input. |