diff options
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/CGBuiltin.cpp | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp index 1a53f62440..48ed65e3c7 100644 --- a/lib/CodeGen/CGBuiltin.cpp +++ b/lib/CodeGen/CGBuiltin.cpp @@ -1348,7 +1348,11 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD, case Builtin::BI__builtin_addcs: case Builtin::BI__builtin_addc: case Builtin::BI__builtin_addcl: - case Builtin::BI__builtin_addcll: { + case Builtin::BI__builtin_addcll: + case Builtin::BI__builtin_subcs: + case Builtin::BI__builtin_subc: + case Builtin::BI__builtin_subcl: + case Builtin::BI__builtin_subcll: { // We translate all of these builtins from expressions of the form: // int x = ..., y = ..., carryin = ..., carryout, result; @@ -1374,7 +1378,23 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD, std::pair<llvm::Value*, unsigned> CarryOutPtr = EmitPointerWithAlignment(E->getArg(3)); - const llvm::Intrinsic::ID IntrinsicId = llvm::Intrinsic::uadd_with_overflow; + // Decide if we are lowering to a uadd.with.overflow or usub.with.overflow. + llvm::Intrinsic::ID IntrinsicId; + switch (BuiltinID) { + default: llvm_unreachable("Unknown multiprecision builtin id."); + case Builtin::BI__builtin_addcs: + case Builtin::BI__builtin_addc: + case Builtin::BI__builtin_addcl: + case Builtin::BI__builtin_addcll: + IntrinsicId = llvm::Intrinsic::uadd_with_overflow; + break; + case Builtin::BI__builtin_subcs: + case Builtin::BI__builtin_subc: + case Builtin::BI__builtin_subcl: + case Builtin::BI__builtin_subcll: + IntrinsicId = llvm::Intrinsic::usub_with_overflow; + break; + } // Construct our resulting LLVM IR expression. llvm::Value *Carry1; |