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Nirav Dave c7f26fe4ae In visitSTORE, always use FindBetterChain, rather than only when UseAA is enabled. 
* Simplify Consecutive Merge Store Candidate Search

    Now that address aliasing is much less conservative, push through
    simplified store merging search and chain alias analysis which only
    checks for parallel stores through the chain subgraph. This is cleaner
    as the separation of non-interfering loads/stores from the
    store-merging logic.

    When merging stores search up the chain through a single load, and
    finds all possible stores by looking down from through a load and a
    TokenFactor to all stores visited.

    This improves the quality of the output SelectionDAG and the output
    Codegen (save perhaps for some ARM cases where we correctly constructs
    wider loads, but then promotes them to float operations which appear
    but requires more expensive constant generation).

    Some minor peephole optimizations to deal with improved SubDAG shapes (listed below)

    Additional Minor Changes:

      1. Finishes removing unused AliasLoad code

      2. Unifies the chain aggregation in the merged stores across code
         paths

      3. Re-add the Store node to the worklist after calling
         SimplifyDemandedBits.

      4. Increase GatherAllAliasesMaxDepth from 6 to 18. That number is
         arbitrary, but seems sufficient to not cause regressions in
         tests.

      5. Remove Chain dependencies of Memory operations on CopyfromReg
         nodes as these are captured by data dependence

      6. Forward loads-store values through tokenfactors containing
          {CopyToReg,CopyFromReg} Values.

      7. Peephole to convert buildvector of extract_vector_elt to
         extract_subvector if possible (see
         CodeGen/AArch64/store-merge.ll)

      8. Store merging for the ARM target is restricted to 32-bit as
         some in some contexts invalid 64-bit operations are being
         generated. This can be removed once appropriate checks are
         added.

    This finishes the change Matt Arsenault started in r246307 and
    jyknight's original patch.

    Many tests required some changes as memory operations are now
    reorderable, improving load-store forwarding. One test in
    particular is worth noting:

      CodeGen/PowerPC/ppc64-align-long-double.ll - Improved load-store
      forwarding converts a load-store pair into a parallel store and
      a memory-realized bitcast of the same value. However, because we
      lose the sharing of the explicit and implicit store values we
      must create another local store. A similar transformation
      happens before SelectionDAG as well.

    Reviewers: arsenm, hfinkel, tstellarAMD, jyknight, nhaehnle

llvm-svn: 293184
2017-01-26 16:02:24 +00:00
..
Analysis [SCEV] Introduce add operation inlining limit 2017-01-26 13:33:17 +00:00
Assembler [NVPTX] Auto-upgrade some NVPTX intrinsics to LLVM target-generic code. 2017-01-21 01:00:32 +00:00
Bindings [cmake] Canonicalize CMake booleans to 0/1 for lit interop 2017-01-06 21:33:48 +00:00
Bitcode [ThinLTO] Subsume all importing checks into a single flag 2017-01-05 14:32:16 +00:00
BugPoint
CodeGen In visitSTORE, always use FindBetterChain, rather than only when UseAA is enabled. 2017-01-26 16:02:24 +00:00
DebugInfo [pdb] Fix failing test 2017-01-25 21:21:02 +00:00
Examples
ExecutionEngine RuntimeDyldELF: add LDST128_ABS_LO12_NC reloc 2017-01-23 13:52:08 +00:00
Feature Fix some broken CHECK lines. 2017-01-22 20:28:56 +00:00
FileCheck Commit a test for match-full-lines. 2017-01-09 23:11:25 +00:00
Instrumentation [sanitizer-coverage] emit __sanitizer_cov_trace_pc_guard w/o a preceding 'if' by default. Update the docs, also add deprecation notes around other parts of sanitizer coverage 2017-01-24 00:57:31 +00:00
Integer
JitListener [cmake] Canonicalize CMake booleans to 0/1 for lit interop 2017-01-06 21:33:48 +00:00
LibDriver
Linker
LTO IPO, LTO: Plumb the summary from the LTO API into the pass manager. 2017-01-20 22:18:52 +00:00
MC Revert "[mips] N64 static relocation model support" 2017-01-26 10:46:07 +00:00
Object Add support for the new LC_NOTE load command. 2017-01-19 17:36:31 +00:00
ObjectYAML Attempt to fix the testcase in r292824 2017-01-23 20:42:17 +00:00
Other [PH] Replace uses of AssertingVH from members of analysis results with 2017-01-24 12:55:57 +00:00
SymbolRewriter
TableGen
ThinLTO/X86 [LTO] Add test to show up we don't support ThinLTO yet. 2017-01-24 00:59:00 +00:00
tools gold-plugin: Fix test case. 2017-01-26 02:15:08 +00:00
Transforms [LV] Fix an issue where forming LCSSA in the place that we did would 2017-01-26 10:41:09 +00:00
Unit
Verifier
YAMLParser
.clang-format
CMakeLists.txt [llvm-config] Print --system-libs only when static linking 2017-01-06 21:33:54 +00:00
lit.cfg [llvm-config] Print --system-libs only when static linking 2017-01-06 21:33:54 +00:00
lit.site.cfg.in [llvm-config] Print --system-libs only when static linking 2017-01-06 21:33:54 +00:00
TestRunner.sh