diff options
| -rw-r--r-- | lib/CodeGen/TargetInfo.cpp | 12 | ||||
| -rw-r--r-- | test/CodeGen/ms_abi.c | 13 |
2 files changed, 24 insertions, 1 deletions
diff --git a/lib/CodeGen/TargetInfo.cpp b/lib/CodeGen/TargetInfo.cpp index 4b8006428f..abd633280b 100644 --- a/lib/CodeGen/TargetInfo.cpp +++ b/lib/CodeGen/TargetInfo.cpp @@ -3543,7 +3543,17 @@ ABIArgInfo X86_64ABIInfo::classifyRegCallStructType(QualType Ty, void X86_64ABIInfo::computeInfo(CGFunctionInfo &FI) const { - bool IsRegCall = FI.getCallingConvention() == llvm::CallingConv::X86_RegCall; + const unsigned CallingConv = FI.getCallingConvention(); + // It is possible to force Win64 calling convention on any x86_64 target by + // using __attribute__((ms_abi)). In such case to correctly emit Win64 + // compatible code delegate this call to WinX86_64ABIInfo::computeInfo. + if (CallingConv == llvm::CallingConv::Win64) { + WinX86_64ABIInfo Win64ABIInfo(CGT); + Win64ABIInfo.computeInfo(FI); + return; + } + + bool IsRegCall = CallingConv == llvm::CallingConv::X86_RegCall; // Keep track of the number of assigned registers. unsigned FreeIntRegs = IsRegCall ? 11 : 6; diff --git a/test/CodeGen/ms_abi.c b/test/CodeGen/ms_abi.c index 407087e409..7486166c78 100644 --- a/test/CodeGen/ms_abi.c +++ b/test/CodeGen/ms_abi.c @@ -146,3 +146,16 @@ void __attribute__((sysv_abi)) f6(__builtin_ms_va_list ap) { // WIN64: %[[AP_VAL:.*]] = load i8*, i8** %[[AP]] // WIN64-NEXT: store i8* %[[AP_VAL]], i8** %[[AP2:.*]] } + +// This test checks if structs are passed according to Win64 calling convention +// when it's enforced by __attribute((ms_abi)). +struct i128 { + unsigned long long a; + unsigned long long b; +}; + +__attribute__((ms_abi)) struct i128 f7(struct i128 a) { + // WIN64: define void @f7(%struct.i128* noalias sret %agg.result, %struct.i128* %a) + // FREEBSD: define win64cc void @f7(%struct.i128* noalias sret %agg.result, %struct.i128* %a) + return a; +} |