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bbc7016c60
%V = mul i64 %N, 4 %t = getelementptr i8* bitcast (i32* %arr to i8*), i32 %V into %t1 = getelementptr i32* %arr, i32 %N %t = bitcast i32* %t1 to i8* incorporating the multiplication into the getelementptr. This happens all the time in dragonegg, for example for int foo(int *A, int N) { return A[N]; } because gcc turns this into byte pointer arithmetic before it hits the plugin: D.1590_2 = (long unsigned int) N_1(D); D.1591_3 = D.1590_2 * 4; D.1592_5 = A_4(D) + D.1591_3; D.1589_6 = *D.1592_5; return D.1589_6; The D.1592_5 line is a POINTER_PLUS_EXPR, which is turned into a getelementptr on a bitcast of A_4 to i8*, so this becomes exactly the kind of IR that the transform fires on. An analogous transform (with no testcases!) already existed for bitcasts of arrays, so I rewrote it to share code with this one. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166474 91177308-0d34-0410-b5e6-96231b3b80d8 |
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.. | ||
ADCE | ||
ArgumentPromotion | ||
BBVectorize | ||
BlockPlacement | ||
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 | ||
LoopVectorize | ||
LowerAtomic | ||
LowerExpectIntrinsic | ||
LowerInvoke | ||
LowerSwitch | ||
Mem2Reg | ||
MemCpyOpt | ||
MergeFunc | ||
MetaRenamer | ||
ObjCARC | ||
PhaseOrdering | ||
PruneEH | ||
Reassociate | ||
ScalarRepl | ||
SCCP | ||
SimplifyCFG | ||
SimplifyLibCalls | ||
Sink | ||
SROA | ||
StripSymbols | ||
TailCallElim | ||
TailDup |