[VFABI] Read/Write functions for the VFABI attribute.

The attribute is stored at the `FunctionIndex` attribute set, with the
name "vector-function-abi-variant".

The get/set methods of the attribute have assertion to verify that:

1. Each name in the attribute is a valid VFABI mangled name.

2. Each name in the attribute correspond to a function declared in the
   module.

Differential Revision: https://reviews.llvm.org/D69976

2 files changed, 22 insertions, 2 deletions

diff --git a/llvm/lib/Analysis/VFABIDemangling.cpp b/llvm/lib/Analysis/VFABIDemangling.cpp
index 6fd8ae63f5f..152f7ae4667 100644
--- a/llvm/lib/Analysis/VFABIDemangling.cpp
+++ b/llvm/lib/Analysis/VFABIDemangling.cpp
@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/ADT/SmallSet.h"
+#include "llvm/ADT/SmallString.h"
 #include "llvm/Analysis/VectorUtils.h"
 
 using namespace llvm;
@@ -34,7 +36,6 @@ ParseRet tryParseISA(StringRef &MangledName, VFISAKind &ISA) {
             .Case("d", VFISAKind::AVX2)
             .Case("e", VFISAKind::AVX512)
             .Default(VFISAKind::Unknown);
-
   MangledName = MangledName.drop_front(1);
 
   return ParseRet::OK;
@@ -338,7 +339,7 @@ Optional<VFInfo> VFABI::tryDemangleForVFABI(StringRef MangledName) {
     }
   } while (ParamFound == ParseRet::OK);
 
-  // A valid MangledName mus have at least one valid entry in the
+  // A valid MangledName must have at least one valid entry in the
   // <parameters>.
   if (Parameters.empty())
     return None;
diff --git a/llvm/lib/Analysis/VectorUtils.cpp b/llvm/lib/Analysis/VectorUtils.cpp
index 600f57ab9d7..90e326687f7 100644
--- a/llvm/lib/Analysis/VectorUtils.cpp
+++ b/llvm/lib/Analysis/VectorUtils.cpp
@@ -1159,3 +1159,22 @@ void InterleaveGroup<Instruction>::addMetadata(Instruction *NewInst) const {
   propagateMetadata(NewInst, VL);
 }
 }
+
+void VFABI::getVectorVariantNames(
+    const CallInst &CI, SmallVectorImpl<std::string> &VariantMappings) {
+  const StringRef S =
+      CI.getAttribute(AttributeList::FunctionIndex, VFABI::MappingsAttrName)
+          .getValueAsString();
+  SmallVector<StringRef, 8> ListAttr;
+  S.split(ListAttr, ",");
+
+  for (auto &S : SetVector<StringRef>(ListAttr.begin(), ListAttr.end())) {
+#ifndef NDEBUG
+    Optional<VFInfo> Info = VFABI::tryDemangleForVFABI(S);
+    assert(Info.hasValue() && "Invalid name for a VFABI variant.");
+    assert(CI.getModule()->getFunction(Info.getValue().VectorName) &&
+           "Vector function is missing.");
+#endif
+    VariantMappings.push_back(S);
+  }
+}