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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
..
2007-07-25-DominatedLoop.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-07-25-InfiniteLoop.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-07-25-Loop.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-07-25-NestedLoop.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-07-25-SinglePredecessor.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-07-26-InterlockingLoops.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2007-07-26-NonRedundant.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-07-26-PhiErasure.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-07-30-PredIDom.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-07-31-NoDomInherit.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
2007-07-31-RedundantPhi.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2008-02-12-UndefLoad.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
2008-02-13-NewPHI.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2008-07-02-Unreachable.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2008-12-09-SelfRemove.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2008-12-12-RLE-Crash.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2008-12-14-rle-reanalyze.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2008-12-15-CacheVisited.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-01-21-SortInvalidation.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-01-22-SortInvalidation.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-02-17-LoadPRECrash.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
2009-03-10-PREOnVoid.ll [opaque pointer type] Add textual IR support for explicit type parameter for global aliases 2015-09-11 03:22:04 +00:00
2009-06-17-InvalidPRE.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-07-13-MemDepSortFail.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-11-12-MemDepMallocBitCast.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2010-03-31-RedundantPHIs.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2010-05-08-OneBit.ll Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
2010-11-13-Simplify.ll
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2011-04-27-phioperands.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2011-06-01-NonLocalMemdepMiscompile.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2011-07-07-MatchIntrinsicExtract.ll
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2011-09-07-TypeIdFor.ll Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
2012-05-22-PreCrash.ll
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MemdepMiscompile.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
assume-equal.ll Fix for two constant propagation problems in GVN with the assume intrinsic 2016-01-21 21:32:35 +00:00
atomic.ll MemoryDependenceAnalysis: Don't miscompile atomics 2015-03-21 06:19:17 +00:00
basic-undef-test.ll Update BasicAliasAnalysis to understand that nothing aliases with undef values. 2015-05-05 18:10:49 +00:00
basic.ll [PM] Port GVN to the new pass manager, wire it up, and teach a couple of 2016-03-11 08:50:55 +00:00
big-endian.ll [GVN] Fix handling of sub-byte types in big-endian mode 2016-04-07 15:45:02 +00:00
bitcast-of-call.ll
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br-identical.ll GVN: If a branch has two identical successors, we cannot declare either dead. 2015-06-25 18:32:02 +00:00
calloc-load-removal.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
calls-nonlocal.ll
…
calls-readonly.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
commute.ll
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cond_br.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
cond_br2.ll Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
condprop.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
crash-no-aa.ll [PM/AA] Rebuild LLVM's alias analysis infrastructure in a way compatible 2015-09-09 17:55:00 +00:00
crash.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
edge.ll only propagate equality comparisons of FP values that we are certain are non-zero 2015-02-25 22:46:08 +00:00
fence.ll Allow value forwarding past release fences in GVN 2016-03-25 22:40:35 +00:00
fpmath.ll IR: Make metadata typeless in assembly 2014-12-15 19:07:53 +00:00
funclet.ll [IR] Reformulate LLVM's EH funclet IR 2015-12-12 05:38:55 +00:00
invariant-load.ll [PRE] Preserve !invariant.load metadata 2015-11-17 00:15:09 +00:00
invariant.group.ll inariant.group handling in GVN 2015-10-02 22:12:22 +00:00
lifetime-simple.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
load-constant-mem.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
load-from-unreachable-predecessor.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
load-pre-align.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
load-pre-licm.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
load-pre-nonlocal.ll [DebugInfo] Fix tests so that each subprogram belongs to a CU. 2016-04-05 23:37:08 +00:00
local-pre.ll
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lpre-call-wrap-2.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
lpre-call-wrap.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
malloc-load-removal.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
no_speculative_loads_with_asan.ll Disable gvn non-local speculative loads under asan. 2015-11-18 20:43:00 +00:00
noalias.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
non-local-offset.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
nonescaping-malloc.ll Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
null-aliases-nothing.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
phi-translate-partial-alias.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
phi-translate.ll [DebugInfo] Fix tests so that each subprogram belongs to a CU. 2016-04-05 23:37:08 +00:00
pr10820.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
pr12979.ll [GVN] Intersect the IR flags when CSE'ing two instructions 2015-06-24 21:52:25 +00:00
pr14166.ll [PM/AA] Rebuild LLVM's alias analysis infrastructure in a way compatible 2015-09-09 17:55:00 +00:00
pr17732.ll Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
pr17852.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
pr24397.ll [PHITransAddr] Don't assume that instruction operands are translatable 2015-08-09 15:43:02 +00:00
pr24426.ll Preserve CFG in MergedLoadStoreMotion. This fixes PR24426. 2015-10-18 19:34:10 +00:00
pr25440.ll Fix bug 25440: GVN assertion after coercing loads 2015-11-19 02:45:18 +00:00
pre-basic-add.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
pre-compare.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
pre-gep-load.ll [PM] Port GVN to the new pass manager, wire it up, and teach a couple of 2016-03-11 08:50:55 +00:00
pre-load.ll [IR] Reformulate LLVM's EH funclet IR 2015-12-12 05:38:55 +00:00
pre-new-inst.ll GVN: tolerate an instruction being replaced without existing in the leaderboard 2015-07-14 21:03:18 +00:00
pre-no-cost-phi.ll Allow PRE to insert no-cost phi nodes 2015-02-03 20:37:08 +00:00
pre-single-pred.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
preserve-tbaa.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
range.ll [GVN] Make a test case more robust 2015-10-28 03:20:05 +00:00
readattrs.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
rle-must-alias.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
rle-no-phi-translate.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
rle-nonlocal.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
rle-phi-translate.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
rle-semidominated.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
rle.ll Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
tbaa.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
unreachable_block_infinite_loop.ll [PHITransAddr] Don't translate unreachable values 2015-06-01 00:15:08 +00:00
volatile-nonvolatile.ll More detailed dependence test between volatile and non-volatile accesses 2016-02-22 23:07:43 +00:00
volatile.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00