[SVFS] Inject TLI Mappings in VFABI attribute.

This patch introduces a function pass to inject the scalar-to-vector
mappings stored in the TargetLIbraryInfo (TLI) into the Vector
Function ABI (VFABI) variants attribute.

The test is testing the injection for three vector libraries supported
by the TLI (Accelerate, SVML, MASSV).

The pass does not change any of the analysis associated to the
function.

Differential Revision: https://reviews.llvm.org/D70107

1 files changed, 16 insertions, 0 deletions

diff --git a/llvm/lib/Analysis/TargetLibraryInfo.cpp b/llvm/lib/Analysis/TargetLibraryInfo.cpp
index 0d0e8f1eeca..f1d4268ad42 100644
--- a/llvm/lib/Analysis/TargetLibraryInfo.cpp
+++ b/llvm/lib/Analysis/TargetLibraryInfo.cpp
@@ -1637,3 +1637,19 @@ INITIALIZE_PASS(TargetLibraryInfoWrapperPass, "targetlibinfo",
 char TargetLibraryInfoWrapperPass::ID = 0;
 
 void TargetLibraryInfoWrapperPass::anchor() {}
+
+unsigned TargetLibraryInfoImpl::getWidestVF(StringRef ScalarF) const {
+  ScalarF = sanitizeFunctionName(ScalarF);
+  if (ScalarF.empty())
+    return 1;
+
+  unsigned VF = 1;
+  std::vector<VecDesc>::const_iterator I =
+      llvm::lower_bound(VectorDescs, ScalarF, compareWithScalarFnName);
+  while (I != VectorDescs.end() && StringRef(I->ScalarFnName) == ScalarF) {
+    if (I->VectorizationFactor > VF)
+      VF = I->VectorizationFactor;
+    ++I;
+  }
+  return VF;
+}