diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86ISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 4d9d4616e69..ad844601c24 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -2082,6 +2082,9 @@ X86TargetLowering::LowerReturn(SDValue Chain, RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT())); } + // Swift calling convention does not require we copy the sret argument + // into %rax/%eax for the return, and SRetReturnReg is not set for Swift. + // All x86 ABIs require that for returning structs by value we copy // the sret argument into %rax/%eax (depending on ABI) for the return. // We saved the argument into a virtual register in the entry block, @@ -2610,6 +2613,11 @@ SDValue X86TargetLowering::LowerFormalArguments( } for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { + // Swift calling convention does not require we copy the sret argument + // into %rax/%eax for the return. We don't set SRetReturnReg for Swift. + if (CallConv == CallingConv::Swift) + continue; + // All x86 ABIs require that for returning structs by value we copy the // sret argument into %rax/%eax (depending on ABI) for the return. Save // the argument into a virtual register so that we can access it from the |
