Convert the TargetTransformInfo from an immutable pass with dynamic

interfaces which could be extracted from it, and must be provided on
construction, to a chained analysis group.

The end goal here is that TTI works much like AA -- there is a baseline
"no-op" and target independent pass which is in the group, and each
target can expose a target-specific pass in the group. These passes will
naturally chain allowing each target-specific pass to delegate to the
generic pass as needed.

In particular, this will allow a much simpler interface for passes that
would like to use TTI -- they can have a hard dependency on TTI and it
will just be satisfied by the stub implementation when that is all that
is available.

This patch is a WIP however. In particular, the "stub" pass is actually
the one and only pass, and everything there is implemented by delegating
to the target-provided interfaces. As a consequence the tools still have
to explicitly construct the pass. Switching targets to provide custom
passes and sinking the stub behavior into the NoTTI pass is the next
step.

llvm-svn: 171621

1 files changed, 0 insertions, 1 deletions

diff --git a/llvm/lib/Target/Target.cpp b/llvm/lib/Target/Target.cpp
index 3a8a9c9b332..9a78ebc3fac 100644
--- a/llvm/lib/Target/Target.cpp
+++ b/llvm/lib/Target/Target.cpp
@@ -26,7 +26,6 @@ using namespace llvm;
 void llvm::initializeTarget(PassRegistry &Registry) {
   initializeDataLayoutPass(Registry);
   initializeTargetLibraryInfoPass(Registry);
-  initializeTargetTransformInfoPass(Registry);
 }
 
 void LLVMInitializeTarget(LLVMPassRegistryRef R) {