[Clang][SVE] Parse builtin type string for scalable vectors

This patch adds 'q' to mean 'scalable vector' in the builtin
type string, and for SVE will return the matching builtin
type as defined in the C/C++ language extensions for SVE.

This patch also adds some scaffolding to generate the arm_sve.h
header file, and some builtin definitions (+CodeGen) to be able
to implement some simple masked load intrinsics that use the
ACLE types, such as:

 svint8_t test_svld1_s8(svbool_t pg, const int8_t *base) {
   return svld1_s8(pg, base);
 }

Reviewers: efriedma, rjmccall, rovka, rsandifo-arm, rengolin

Reviewed By: efriedma

Tags: #clang

Differential Revision: https://reviews.llvm.org/D75298

1 files changed, 6 insertions, 4 deletions

diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index d6c2afc..3393b1b 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -495,13 +495,15 @@ 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((uint64_t)LargestVectorWidth,
-                                   VT->getPrimitiveSizeInBits().getFixedSize());
+      LargestVectorWidth =
+          std::max((uint64_t)LargestVectorWidth,
+                   VT->getPrimitiveSizeInBits().getKnownMinSize());
 
   // Update vector width based on return type.
   if (auto *VT = dyn_cast<llvm::VectorType>(CurFn->getReturnType()))
-    LargestVectorWidth = std::max((uint64_t)LargestVectorWidth,
-                                  VT->getPrimitiveSizeInBits().getFixedSize());
+    LargestVectorWidth =
+        std::max((uint64_t)LargestVectorWidth,
+                 VT->getPrimitiveSizeInBits().getKnownMinSize());
 
   // Add the required-vector-width attribute. This contains the max width from:
   // 1. min-vector-width attribute used in the source program.