[SVE][IR] Scalable Vector size queries and IR instruction support

* Adds a TypeSize struct to represent the known minimum size of a type
  along with a flag to indicate that the runtime size is a integer multiple
  of that size
* Converts existing size query functions from Type.h and DataLayout.h to
  return a TypeSize result
* Adds convenience methods (including a transparent conversion operator
  to uint64_t) so that most existing code 'just works' as if the return
  values were still scalars.
* Uses the new size queries along with ElementCount to ensure that all
  supported instructions used with scalable vectors can be constructed
  in IR.

Reviewers: hfinkel, lattner, rkruppe, greened, rovka, rengolin, sdesmalen

Reviewed By: rovka, sdesmalen

Differential Revision: https://reviews.llvm.org/D53137

llvm-svn: 374042

1 files changed, 4 insertions, 4 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index e934ab34a3a..41b7f2f4b1b 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -431,13 +431,13 @@ void CodeGenFunction::FinishFunction(SourceLocation EndLoc) {
   // Scan function arguments for vector width.
   for (llvm::Argument &A : CurFn->args())
     if (auto *VT = dyn_cast<llvm::VectorType>(A.getType()))
-      LargestVectorWidth = std::max(LargestVectorWidth,
-                                    VT->getPrimitiveSizeInBits());
+      LargestVectorWidth = std::max((uint64_t)LargestVectorWidth,
+                                   VT->getPrimitiveSizeInBits().getFixedSize());
 
   // Update vector width based on return type.
   if (auto *VT = dyn_cast<llvm::VectorType>(CurFn->getReturnType()))
-    LargestVectorWidth = std::max(LargestVectorWidth,
-                                  VT->getPrimitiveSizeInBits());
+    LargestVectorWidth = std::max((uint64_t)LargestVectorWidth,
+                                  VT->getPrimitiveSizeInBits().getFixedSize());
 
   // Add the required-vector-width attribute. This contains the max width from:
   // 1. min-vector-width attribute used in the source program.