Implement __emul, __emulu, _mul128 and _umul128 MS intrinsics

Reviewers: rnk, thakis, majnemer, hans

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D25353

llvm-svn: 283785

1 files changed, 21 insertions, 8 deletions

diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index d05e910f244..5cbb6a2338f 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -7576,16 +7576,24 @@ Value *CodeGenFunction::EmitX86BuiltinExpr(unsigned BuiltinID,
   case X86::BI__builtin_ia32_cmpordsd:
     return getCmpIntrinsicCall(Intrinsic::x86_sse2_cmp_sd, 7);
 
+  case X86::BI__emul:
+  case X86::BI__emulu: {
+    llvm::Type *Int64Ty = llvm::IntegerType::get(getLLVMContext(), 64);
+    bool isSigned = (BuiltinID == X86::BI__emul);
+    Value *LHS = Builder.CreateIntCast(Ops[0], Int64Ty, isSigned);
+    Value *RHS = Builder.CreateIntCast(Ops[1], Int64Ty, isSigned);
+    return Builder.CreateMul(LHS, RHS, "", !isSigned, isSigned);
+  }
   case X86::BI__mulh:
-  case X86::BI__umulh: {
-    Value *LHS = EmitScalarExpr(E->getArg(0));
-    Value *RHS = EmitScalarExpr(E->getArg(1));
+  case X86::BI__umulh:
+  case X86::BI_mul128:
+  case X86::BI_umul128: {
     llvm::Type *ResType = ConvertType(E->getType());
     llvm::Type *Int128Ty = llvm::IntegerType::get(getLLVMContext(), 128);
 
-    bool IsSigned = (BuiltinID == X86::BI__mulh);
-    LHS = Builder.CreateIntCast(LHS, Int128Ty, IsSigned);
-    RHS = Builder.CreateIntCast(RHS, Int128Ty, IsSigned);
+    bool IsSigned = (BuiltinID == X86::BI__mulh || BuiltinID == X86::BI_mul128);
+    Value *LHS = Builder.CreateIntCast(Ops[0], Int128Ty, IsSigned);
+    Value *RHS = Builder.CreateIntCast(Ops[1], Int128Ty, IsSigned);
 
     Value *MulResult, *HigherBits;
     if (IsSigned) {
@@ -7595,9 +7603,14 @@ Value *CodeGenFunction::EmitX86BuiltinExpr(unsigned BuiltinID,
       MulResult = Builder.CreateNUWMul(LHS, RHS);
       HigherBits = Builder.CreateLShr(MulResult, 64);
     }
-
     HigherBits = Builder.CreateIntCast(HigherBits, ResType, IsSigned);
-    return HigherBits;
+
+    if (BuiltinID == X86::BI__mulh || BuiltinID == X86::BI__umulh)
+      return HigherBits;
+
+    Address HighBitsAddress = EmitPointerWithAlignment(E->getArg(2));
+    Builder.CreateStore(HigherBits, HighBitsAddress);
+    return Builder.CreateIntCast(MulResult, ResType, IsSigned);
   }
   }
 }