[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

llvm-svn: 353059

1 files changed, 16 insertions, 7 deletions

diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
index 1000e210533..404749b2d8e 100644
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -4574,22 +4574,31 @@ void Verifier::visitIntrinsicCall(Intrinsic::ID ID, CallBase &Call) {
            "of ints");
     break;
   }
-  case Intrinsic::smul_fix: {
+  case Intrinsic::smul_fix:
+  case Intrinsic::umul_fix: {
     Value *Op1 = Call.getArgOperand(0);
     Value *Op2 = Call.getArgOperand(1);
     Assert(Op1->getType()->isIntOrIntVectorTy(),
-           "first operand of smul_fix must be an int type or vector "
+           "first operand of [us]mul_fix must be an int type or vector "
            "of ints");
     Assert(Op2->getType()->isIntOrIntVectorTy(),
-           "second operand of smul_fix must be an int type or vector "
+           "second operand of [us]mul_fix must be an int type or vector "
            "of ints");
 
     auto *Op3 = dyn_cast<ConstantInt>(Call.getArgOperand(2));
-    Assert(Op3, "third argument of smul_fix must be a constant integer");
+    Assert(Op3, "third argument of [us]mul_fix must be a constant integer");
     Assert(Op3->getType()->getBitWidth() <= 32,
-           "third argument of smul_fix must fit within 32 bits");
-    Assert(Op3->getZExtValue() < Op1->getType()->getScalarSizeInBits(),
-           "the scale of smul_fix must be less than the width of the operands");
+           "third argument of [us]mul_fix must fit within 32 bits");
+
+    if (ID == Intrinsic::smul_fix) {
+      Assert(
+          Op3->getZExtValue() < Op1->getType()->getScalarSizeInBits(),
+          "the scale of smul_fix must be less than the width of the operands");
+    } else {
+      Assert(Op3->getZExtValue() <= Op1->getType()->getScalarSizeInBits(),
+             "the scale of umul_fix must be less than or equal to the width of "
+             "the operands");
+    }
     break;
   }
   };