[AtomicExpand] Add bitcasts when expanding load atomic vectorusers/jofrn/spr/main/f430c1afusers/jofrn/atomicvec-stack3users/jofrn/atomicvec-stack2

AtomicExpand fails for aligned `load atomic <n x T>` because it
does not find a compatible library call. This change adds appropriate
bitcasts so that the call can be lowered. It also adds support for
128 bit lowering in tablegen to support SSE/AVX.

commit-id:f430c1af

1 files changed, 12 insertions, 3 deletions

diff --git a/llvm/lib/CodeGen/AtomicExpandPass.cpp b/llvm/lib/CodeGen/AtomicExpandPass.cpp
index c376de8..70f59ea 100644
--- a/llvm/lib/CodeGen/AtomicExpandPass.cpp
+++ b/llvm/lib/CodeGen/AtomicExpandPass.cpp
@@ -2066,9 +2066,18 @@ bool AtomicExpandImpl::expandAtomicOpToLibcall(
     I->replaceAllUsesWith(V);
   } else if (HasResult) {
     Value *V;
-    if (UseSizedLibcall)
-      V = Builder.CreateBitOrPointerCast(Result, I->getType());
-    else {
+    if (UseSizedLibcall) {
+      // Add bitcasts from Result's scalar type to I's <n x ptr> vector type
+      auto *PtrTy = dyn_cast<PointerType>(I->getType()->getScalarType());
+      auto *VTy = dyn_cast<VectorType>(I->getType());
+      if (VTy && PtrTy && !Result->getType()->isVectorTy()) {
+        unsigned AS = PtrTy->getAddressSpace();
+        Value *BC = Builder.CreateBitCast(
+            Result, VTy->getWithNewType(DL.getIntPtrType(Ctx, AS)));
+        V = Builder.CreateIntToPtr(BC, I->getType());
+      } else
+        V = Builder.CreateBitOrPointerCast(Result, I->getType());
+    } else {
       V = Builder.CreateAlignedLoad(I->getType(), AllocaResult,
                                     AllocaAlignment);
       Builder.CreateLifetimeEnd(AllocaResult, SizeVal64);