[PowerPC] Make LDtocL and friends invariant loads
LDtocL, and other loads that roughly correspond to the TOC_ENTRY SDAG node,
represent loads from the TOC, which is invariant. As a result, these loads can
be hoisted out of loops, etc. In order to do this, we need to generate
GOT-style MMOs for TOC_ENTRY, which requires treating it as a legitimate memory
intrinsic node type. Once this is done, the MMO transfer is automatically
handled for TableGen-driven instruction selection, and for nodes generated
directly in PPCISelDAGToDAG, we need to transfer the MMOs manually.
Also, we were not transferring MMOs associated with pre-increment loads, so do
that too.
Lastly, this fixes an exposed bug where R30 was not added as a defined operand of
UpdateGBR.
This problem was highlighted by an example (used to generate the test case)
posted to llvmdev by Francois Pichet.
llvm-svn: 230553
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.h b/llvm/lib/Target/PowerPC/PPCISelLowering.h
index a2a8241..faa1e3f 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.h
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.h
@@ -71,8 +71,6 @@
/// though these are usually folded into other nodes.
Hi, Lo,
- TOC_ENTRY,
-
/// The following two target-specific nodes are used for calls through
/// function pointers in the 64-bit SVR4 ABI.
@@ -337,7 +335,12 @@
/// QBRC, CHAIN = QVLFSb CHAIN, Ptr
/// The 4xf32 load used for v4i1 constants.
- QVLFSb
+ QVLFSb,
+
+ /// GPRC = TOC_ENTRY GA, TOC
+ /// Loads the entry for GA from the TOC, where the TOC base is given by
+ /// the last operand.
+ TOC_ENTRY
};
}