Commit ab7cbc9a authored by Hans Wennborg's avatar Hans Wennborg
Browse files

Merging r297075: 

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r297075 | hans | 2017-03-06 13:10:40 -0800 (Mon, 06 Mar 2017) | 1 line

Disable gvn-hoist (PR32153)
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llvm-svn: 297165
parent d251e94e

llvm/docs/ReleaseNotes.rst

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@@ -57,13 +57,6 @@ Non-comprehensive list of changes in this release 
  with LLVM option ``-adce-remove-loops`` when the loop body otherwise has

  no live operations.



* The GVNHoist pass is now enabled by default. The new pass based on Global

  Value Numbering detects similar computations in branch code and replaces

  multiple instances of the same computation with a unique expression.  The

  transform benefits code size and generates better schedules.  GVNHoist is

  more aggressive at ``-Os`` and ``-Oz``, hoisting more expressions at the

  expense of execution time degradations.



 * The llvm-cov tool can now export coverage data as json. Its html output mode

   has also improved.

llvm/lib/Transforms/IPO/PassManagerBuilder.cpp

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@@ -141,8 +141,8 @@ static cl::opt<int> PreInlineThreshold( 
             "(default = 75)"));



static cl::opt<bool> EnableGVNHoist(

    "enable-gvn-hoist", cl::init(true), cl::Hidden,

    cl::desc("Enable the GVN hoisting pass (default = on)"));

    "enable-gvn-hoist", cl::init(false), cl::Hidden,

    cl::desc("Enable the GVN hoisting pass"));



static cl::opt<bool>

    DisableLibCallsShrinkWrap("disable-libcalls-shrinkwrap", cl::init(false),

llvm/test/Feature/optnone-opt.ll

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@@ -41,7 +41,6 @@ attributes #0 = { optnone noinline } 
; OPT-O1-DAG: Skipping pass 'Combine redundant instructions'

; OPT-O1-DAG: Skipping pass 'Dead Store Elimination'

; OPT-O1-DAG: Skipping pass 'Early CSE'

; OPT-O1-DAG: Skipping pass 'Early GVN Hoisting of Expressions'

; OPT-O1-DAG: Skipping pass 'Jump Threading'

; OPT-O1-DAG: Skipping pass 'MemCpy Optimization'

; OPT-O1-DAG: Skipping pass 'Reassociate expressions'