[Intrinsic] Unsigned Fixed Point Multiplication Intrinsic

Add an intrinsic that takes 2 unsigned integers with the scale of them
provided as the third argument and performs fixed point multiplication on
them.

This is a part of implementing fixed point arithmetic in clang where some of
the more complex operations will be implemented as intrinsics.

Differential Revision: https://reviews.llvm.org/D55625

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353059 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 3 insertions, 2 deletions

diff --git a/include/llvm/CodeGen/ISDOpcodes.h b/include/llvm/CodeGen/ISDOpcodes.h
index 8f9957eff9c..89356641b7b 100644
--- a/include/llvm/CodeGen/ISDOpcodes.h
+++ b/include/llvm/CodeGen/ISDOpcodes.h
@@ -271,12 +271,12 @@ namespace ISD {
     /// resulting value is this minimum value.
     SSUBSAT, USUBSAT,
 
-    /// RESULT = SMULFIX(LHS, RHS, SCALE) - Perform fixed point multiplication on
+    /// RESULT = [US]MULFIX(LHS, RHS, SCALE) - Perform fixed point multiplication on
     /// 2 integers with the same width and scale. SCALE represents the scale of
     /// both operands as fixed point numbers. This SCALE parameter must be a
     /// constant integer. A scale of zero is effectively performing
     /// multiplication on 2 integers.
-    SMULFIX,
+    SMULFIX, UMULFIX,
 
     /// Simple binary floating point operators.
     FADD, FSUB, FMUL, FDIV, FREM,
diff --git a/include/llvm/CodeGen/TargetLowering.h b/include/llvm/CodeGen/TargetLowering.h
index 4a44a9e6c55..4a00556a537 100644
--- a/include/llvm/CodeGen/TargetLowering.h
+++ b/include/llvm/CodeGen/TargetLowering.h
@@ -836,6 +836,7 @@ public:
     default:
       llvm_unreachable("Unexpected fixed point operation.");
     case ISD::SMULFIX:
+    case ISD::UMULFIX:
       Supported = isSupportedFixedPointOperation(Op, VT, Scale);
       break;
     }