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79590b8edf
%shr = lshr i64 %key, 3 %0 = load i64* %val, align 8 %sub = add i64 %0, -1 %and = and i64 %sub, %shr ret i64 %and to: %shr = lshr i64 %key, 3 %0 = load i64* %val, align 8 %sub = add i64 %0, 2305843009213693951 %and = and i64 %sub, %shr ret i64 %and The demanded bit optimization is actually a pessimization because add -1 would be codegen'ed as a sub 1. Teach the demanded constant shrinking optimization to check for negated constant to make sure it is actually reducing the width of the constant. rdar://11793464 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160101 91177308-0d34-0410-b5e6-96231b3b80d8 |
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.. | ||
ADCE | ||
ArgumentPromotion | ||
BBVectorize | ||
BlockPlacement | ||
BoundsChecking | ||
BranchFolding | ||
CodeExtractor | ||
CodeGenPrepare | ||
ConstantMerge | ||
ConstProp | ||
CorrelatedValuePropagation | ||
DeadArgElim | ||
DeadStoreElimination | ||
EarlyCSE | ||
FunctionAttrs | ||
GlobalDCE | ||
GlobalOpt | ||
GVN | ||
IndVarSimplify | ||
Inline | ||
InstCombine | ||
InstSimplify | ||
Internalize | ||
IPConstantProp | ||
JumpThreading | ||
LCSSA | ||
LICM | ||
LoopDeletion | ||
LoopIdiom | ||
LoopRotate | ||
LoopSimplify | ||
LoopStrengthReduce | ||
LoopUnroll | ||
LoopUnswitch | ||
LowerAtomic | ||
LowerExpectIntrinsic | ||
LowerInvoke | ||
LowerSwitch | ||
Mem2Reg | ||
MemCpyOpt | ||
MergeFunc | ||
ObjCARC | ||
PhaseOrdering | ||
PruneEH | ||
Reassociate | ||
ScalarRepl | ||
SCCP | ||
SimplifyCFG | ||
SimplifyLibCalls | ||
Sink | ||
StripSymbols | ||
TailCallElim | ||
TailDup |