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llvm-project/llvm/lib/Transforms/Scalar
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Ulrich Weigand 6e6966460a [GVN] Fix handling of sub-byte types in big-endian mode 
When GVN wants to re-interpret an already available value in a smaller
type, it needs to right-shift the value on big-endian systems to ensure
the correct bytes are accessed.  The shift value is the difference of
the sizes of the two types.

This is correct as long as both types occupy multiples of full bytes.
However, when one of them is a sub-byte type like i1, this no longer
holds true: we still need to shift, but only to access the correct
*byte*.  Accessing bits within the byte requires no shift in either
endianness; e.g. an i1 resides in the least-significant bit of its
containing byte on both big- and little-endian systems.

Therefore, the appropriate shift value to be used is the difference of
the *storage* sizes of the two types.  This is already handled correctly
in one place where such a shift takes place (GetStoreValueForLoad), but
is incorrect in two other places: GetLoadValueForLoad and
CoerceAvailableValueToLoadType.

This patch changes both places to use the storage size as well.

Differential Revision: http://reviews.llvm.org/D18662

llvm-svn: 265684
 		2016-04-07 15:45:02 +00:00
..
ADCE.cpp ADCE: Remove debug info intrinsics in dead scopes 2016-03-29 22:57:12 +00:00
AlignmentFromAssumptions.cpp [SCEV] Add and use SCEVConstant::getAPInt; NFCI 2015-12-17 20:28:46 +00:00
BDCE.cpp Add GlobalsAA as preserved to a bunch of transforms 2015-09-10 10:22:12 +00:00
CMakeLists.txt Introduce a @llvm.experimental.guard intrinsic 2016-03-31 00:18:46 +00:00
ConstantHoisting.cpp Scalar: Remove some implicit ilist iterator conversions, NFC 2015-10-13 18:26:00 +00:00
ConstantProp.cpp use range loop; NFCI 2016-04-04 23:05:06 +00:00
CorrelatedValuePropagation.cpp [CVP] Replace nonnegative with positive, per Philip's request. NFC. 2016-03-14 13:48:00 +00:00
DCE.cpp Scalar: Remove some implicit ilist iterator conversions, NFC 2015-10-13 18:26:00 +00:00
DeadStoreElimination.cpp [PM] Port memdep to the new pass manager. 2016-03-10 00:55:30 +00:00
EarlyCSE.cpp NFC: make AtomicOrdering an enum class 2016-04-06 21:19:33 +00:00
FlattenCFGPass.cpp Scalar: Remove some implicit ilist iterator conversions, NFC 2015-10-13 18:26:00 +00:00
Float2Int.cpp [Float2Int] Don't operate on vector instructions 2015-12-09 21:08:18 +00:00
GVN.cpp [GVN] Fix handling of sub-byte types in big-endian mode 2016-04-07 15:45:02 +00:00
IndVarSimplify.cpp [IndVarSimplify] Don't insert after a catchswitch 2016-03-30 21:12:06 +00:00
InductiveRangeCheckElimination.cpp IR: RF_IgnoreMissingValues => RF_IgnoreMissingLocals, NFC 2016-04-07 00:26:43 +00:00
JumpThreading.cpp [SimlifyCFG] Prevent passes from destroying canonical loop structure, especially for nested loops 2016-03-29 04:08:57 +00:00
LICM.cpp Fix the build 2016-03-09 23:07:53 +00:00
LLVMBuild.txt Update libdeps in LLVMipo and LLVMScalarOpts, corresponding to r245940. 2015-08-25 17:11:17 +00:00
LoadCombine.cpp Remove PreserveNames template parameter from IRBuilder 2016-03-13 21:05:13 +00:00
LoopDataPrefetch.cpp [LoopDataPrefetch] Centralize the tuning cl::opts under the pass 2016-03-29 23:45:52 +00:00
LoopDeletion.cpp [LoopDeletion] Add an assert that verifies LCSSA 2016-02-21 17:11:59 +00:00
LoopDistribute.cpp [LoopVersioning] Annotate versioned loop with noalias metadata 2016-03-17 20:32:32 +00:00
LoopIdiomRecognize.cpp [LPM] Factor all of the loop analysis usage updates into a common helper 2016-02-19 10:45:18 +00:00
LoopInstSimplify.cpp Simplify logic. NFC. 2016-04-06 13:27:13 +00:00
LoopInterchange.cpp LPM: Stop threading `Pass *` through all of the loop utility APIs. NFC 2015-12-15 19:40:57 +00:00
LoopLoadElimination.cpp [LLE] Check for mismatching types between the store and the load earlier 2016-03-24 17:59:26 +00:00
LoopRerollPass.cpp [PATCH] Force LoopReroll to reset the loop trip count value after reroll. 2016-03-22 13:50:57 +00:00
LoopRotation.cpp IR: RF_IgnoreMissingValues => RF_IgnoreMissingLocals, NFC 2016-04-07 00:26:43 +00:00
LoopSimplifyCFG.cpp [LPM] Factor all of the loop analysis usage updates into a common helper 2016-02-19 10:45:18 +00:00
LoopStrengthReduce.cpp [LoopStrengthReduce] Don't hoist into a catchswitch 2016-03-24 21:40:22 +00:00
LoopUnrollPass.cpp Loop Unroll: add options and tweak to make Partial unrolling more useful 2016-04-06 16:57:25 +00:00
LoopUnswitch.cpp IR: RF_IgnoreMissingValues => RF_IgnoreMissingLocals, NFC 2016-04-07 00:26:43 +00:00
LoopVersioningLICM.cpp Fix MSVC 2013 build after rL260504 2016-02-11 11:27:51 +00:00
LowerAtomic.cpp NFC: make AtomicOrdering an enum class 2016-04-06 21:19:33 +00:00
LowerExpectIntrinsic.cpp fix typo; NFC 2015-08-24 20:11:14 +00:00
LowerGuardIntrinsic.cpp Introduce a @llvm.experimental.guard intrinsic 2016-03-31 00:18:46 +00:00
MemCpyOptimizer.cpp Imporove load to store => memcpy 2016-03-14 22:52:27 +00:00
MergedLoadStoreMotion.cpp [PM] Port memdep to the new pass manager. 2016-03-10 00:55:30 +00:00
NaryReassociate.cpp [opaque pointer types] [NFC] GEP: replace get(Pointer)ElementType uses with get{Source,Result}ElementType. 2016-01-19 17:28:00 +00:00
PartiallyInlineLibCalls.cpp Scalar: Remove remaining ilist iterator implicit conversions 2015-10-13 19:26:58 +00:00
PlaceSafepoints.cpp [PlaceSafepoints] Use DEBUG() instead of TraceLSP 2016-01-28 23:49:27 +00:00
Reassociate.cpp ADT: Remove == and != comparisons between ilist iterators and pointers 2016-02-21 20:39:50 +00:00
Reg2Mem.cpp Scalar: Remove remaining ilist iterator implicit conversions 2015-10-13 19:26:58 +00:00
RewriteStatepointsForGC.cpp Add parentheses to silence warning. 2016-04-06 04:22:00 +00:00
SCCP.cpp Fix build bot breakage 2016-01-24 16:46:53 +00:00
SROA.cpp [SROA] Fix typo in comment 2016-03-28 11:23:21 +00:00
Scalar.cpp Introduce a @llvm.experimental.guard intrinsic 2016-03-31 00:18:46 +00:00
ScalarReplAggregates.cpp [opaque pointer types] [NFC] DataLayout::getIndexedOffset: take source element type instead of pointer type and rename to getIndexedOffsetInType. 2016-01-22 03:08:27 +00:00
Scalarizer.cpp Scalar: Remove remaining ilist iterator implicit conversions 2015-10-13 19:26:58 +00:00
SeparateConstOffsetFromGEP.cpp Bug fix: use dyn_cast_or_null instead of dyn_cast 2016-02-19 02:17:07 +00:00
SimplifyCFGPass.cpp [SimlifyCFG] Prevent passes from destroying canonical loop structure, especially for nested loops 2016-03-29 04:08:57 +00:00
Sink.cpp Remove uses of builtin comma operator. 2016-02-18 22:09:30 +00:00
SpeculativeExecution.cpp Scalar: Remove remaining ilist iterator implicit conversions 2015-10-13 19:26:58 +00:00
StraightLineStrengthReduce.cpp [opaque pointer types] [NFC] GEP: replace get(Pointer)ElementType uses with get{Source,Result}ElementType. 2016-01-19 17:28:00 +00:00
StructurizeCFG.cpp StructurizeCFG: Initialize SkipUniformRegions in the default constructor 2016-02-10 01:10:09 +00:00
TailRecursionElimination.cpp Change isSafeToLoadUnconditionally arguments order. Separated from http://reviews.llvm.org/D10920. 2016-01-15 15:27:46 +00:00