Hal Finkel 3da41a28a1 Revert "Revert '[DAGCombiner] Split up an indexed load if only the base pointer value is live'" ... I reverted r208640 in r209747 because r208640 broke self-hosting on PPC64. The underlying cause of the failure is that pre-inc loads with increments represented by ISD::TargetConstants were being transformed into ISD:::ADDs with ISD::TargetConstant operands. PPC doesn't have a pattern for those, and so they were selected as invalid r+r adds. This recommits r208640, rebased and with an exclusion for ISD::TargetConstant increments. This behavior seems correct, although in the future we might want to ask the target to split out the indexing that uses ISD::TargetConstants. Unfortunately, I don't yet have small test case where the relevant invalid 'add' instruction is not itself dead (and thus eliminated by DeadMachineInstructionElim -- sometimes bugpoint is too good at removing things) Original commit message (by Adam Nemet): Right now the load may not get DCE'd because of the side-effect of updating the base pointer. This can happen if we lower a read-modify-write of an illegal larger type (e.g. i48) such that the modification only affects one of the subparts (the lower i32 part but not the higher i16 part). See the testcase. In order to spot the dead load we need to revisit it when SimplifyDemandedBits decided that the value of the load is masked off. This is the CommitTargetLoweringOpt piece. I checked compile time with ARM64 by sending SPEC bitcode files through llc. No measurable change. Fixes <rdar://problem/16031651> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216898 91177308-0d34-0410-b5e6-96231b3b80d8		2014-09-02 06:24:04 +00:00
..
Analysis	Remove an errant outer loop that contains nothing but an inner loop over exactly the same elements. While no functionality is change intended (and hence there are no changes to tests), you don't want to skip this revision if bisecting for errors.	2014-09-01 05:17:15 +00:00
AsmParser	Fix typos in comments, NFC	2014-08-29 21:53:01 +00:00
Bitcode	Fix a double free in llvm::getBitcodeTargetTriple.	2014-08-27 21:11:13 +00:00
CodeGen	Revert "Revert '[DAGCombiner] Split up an indexed load if only the base pointer value is live'"	2014-09-02 06:24:04 +00:00
DebugInfo	Don't own the buffer in object::Binary.	2014-08-19 18:44:46 +00:00
ExecutionEngine	[MCJIT] Move endian-aware read/writes from RuntimeDyldMachO into	2014-08-29 23:17:47 +00:00
IR	Add a convenience method to copy wrapping, exact, and fast-math flags (NFC).	2014-09-01 18:44:57 +00:00
IRReader	Pass a std::unique_ptr<MemoryBuffer>& to getLazyBitcodeModule.	2014-08-26 22:00:09 +00:00
LineEditor
Linker	Set comdats when lazily linking functions.	2014-08-15 20:17:08 +00:00
LTO	Return a std::unique_ptr when creating a new MemoryBuffer.	2014-08-27 20:03:13 +00:00
MC	MC: remove unnecessary enumeration prefix	2014-09-01 23:48:29 +00:00
Object	Fix typo and formatting	2014-08-30 01:57:34 +00:00
Option	Fix PR17239 by changing the semantics of the RemainingArgsClass Option kind	2014-08-22 19:29:17 +00:00
ProfileData	llvm-cov: add code coverage tool that's based on coverage mapping format and clang's pgo.	2014-08-22 22:56:03 +00:00
Support	Fix some cases where StringRef was being passed by const reference. Remove const from some other StringRefs since its implicitly const already.	2014-08-30 16:48:02 +00:00
TableGen	Comment only: Annotate loop as per mailing list discussion	2014-08-29 22:43:30 +00:00
Target	[PowerPC] Guard against illegal selection of add for TargetConstant operands	2014-09-02 06:23:54 +00:00
Transforms	SROA: Don't insert instructions before a PHI	2014-09-01 21:20:14 +00:00
CMakeLists.txt
LLVMBuild.txt
Makefile