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John Brawn 29bbed3613 [BPI] Detect branches in loops that make themselves not taken 
If we have a loop like this:
 int n = 0;
 while (...) {
  if (++n >= MAX) {
    n = 0;
  }
 }
then the body of the 'if' statement will only be executed once every MAX
iterations. Detect this by looking for branches in loops where taking the branch
makes the branch condition evaluate to 'not taken' in the next iteration of the
loop, and reduce the probability of such branches.

This slightly improves EEMBC benchmarks on cortex-m4/cortex-m33 due to making
better choices in if-conversion, but has no effect on any other cpu/benchmark
that I could detect.

Differential Revision: https://reviews.llvm.org/D35804

llvm-svn: 325925
 		2018-02-23 17:17:31 +00:00
..
AliasSet Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
AssumptionCache Add files I seem to have dropped in my revert (r290086). 2016-12-19 08:32:13 +00:00
BasicAA Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
BlockFrequencyInfo Revert part of "Cleanup some GraphTraits iteration code" 2017-12-08 22:42:43 +00:00
BranchProbabilityInfo [BPI] Detect branches in loops that make themselves not taken 2018-02-23 17:17:31 +00:00
CFLAliasAnalysis [CFLAA] Add missing break; note things are broken. 2017-05-31 02:35:26 +00:00
CallGraph Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
ConstantFolding Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
CostModel revert r325515: [TTI CostModel] change default cost of FP ops to 1 (PR36280) 2018-02-21 01:42:52 +00:00
Delinearization [SCEV] Assume parameters coming from function calls contain IVs 2017-05-27 15:17:49 +00:00
DemandedBits Fix tests after move to utohexstr. 2017-12-28 17:00:37 +00:00
DependenceAnalysis Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
DivergenceAnalysis AMDGPU: Change DivergenceAnalysis for function arguments 2017-04-19 17:42:34 +00:00
DominanceFrontier
…
Dominators [Dominators] Don't compute DFS InOut numbers eagerly. 2017-06-30 01:28:21 +00:00
GlobalsModRef Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
IVUsers Re-enable "[SCEV] Do not fold dominated SCEVUnknown into AddRecExpr start" 2017-05-26 06:47:04 +00:00
LazyCallGraph
…
LazyValueAnalysis [JumpThreading] Preservation of DT and LVI across the pass 2018-01-12 21:06:48 +00:00
Lint [Lint] Upgrade uses of MemoryIntrinic::getAlignment() to new API. (NFCI) 2018-01-31 16:42:15 +00:00
LoopAccessAnalysis [LAA] Allow more run-time alias checks by coercing pointer expressions to AddRecExprs 2017-09-12 07:48:22 +00:00
LoopInfo
…
MemoryDependenceAnalysis [PM] The assumption cache is fundamentally designed to be self-updating, 2017-01-15 00:26:18 +00:00
MemorySSA Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
PostDominators [Dominators] Include infinite loops in PostDominatorTree 2017-08-15 18:14:57 +00:00
ProfileSummary
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RegionInfo [Dominators] Include infinite loops in PostDominatorTree 2017-08-15 18:14:57 +00:00
ScalarEvolution [SCEV] Make getPostIncExpr guaranteed to return AddRec 2018-02-12 05:09:38 +00:00
ScopedNoAliasAA
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TypeBasedAliasAnalysis [Analysis] Support aggregate access types in TBAA 2018-02-02 14:09:22 +00:00
ValueTracking [ValueTracking] add recursion depth param to matchSelectPattern 2018-01-24 15:20:37 +00:00
alias-analysis-uses.ll
…