llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-13 20:32:21 +00:00

History

Hal Finkel 5ecf528fc2 [InstCombine] Remove unnecessary variable indexing into single-element arrays This change addresses a deficiency pointed out in PR22629. To copy from the bug report: [from the bug report] Consider this code: int f(int x) { int a[] = {12}; return a[x]; } GCC knows to optimize this to movl $12, %eax ret The code generated by recent Clang at -O3 is: movslq %edi, %rax movl .L_ZZ1fiE1a(,%rax,4), %eax retq .L_ZZ1fiE1a: .long 12 # 0xc [end from the bug report] This definitely seems worth fixing. I've also seen this kind of code before (as the base case of generic vector wrapper templates with one element). The general idea is to look at the GEP feeding a load or a store, which has some variable as its first non-zero index, and determine if that index must be zero (or else an out-of-bounds access would occur). We can do this for allocas and globals with constant initializers where we know the maximum size of the underlying object. When we find such a GEP, we create a new one for the memory access with that first variable index replaced with a constant zero. Even if we can't eliminate the memory access (and sometimes we can't), it is still useful because it removes unnecessary indexing calculations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229959 91177308-0d34-0410-b5e6-96231b3b80d8		2015-02-20 03:05:53 +00:00
..
2002-03-11-InstCombineHang.ll
2002-05-14-SubFailure.ll
2002-08-02-CastTest.ll
2002-12-05-MissedConstProp.ll
2003-05-26-CastMiscompile.ll
2003-05-27-ConstExprCrash.ll
2003-06-05-BranchInvertInfLoop.ll
2003-07-21-ExternalConstant.ll
2003-08-12-AllocaNonNull.ll
2003-09-09-VolatileLoadElim.ll
2003-10-29-CallSiteResolve.ll
2003-11-03-VarargsCallBug.ll
2004-01-13-InstCombineInvokePHI.ll
2004-02-23-ShiftShiftOverflow.ll
2004-03-13-InstCombineInfLoop.ll
2004-04-04-InstCombineReplaceAllUsesWith.ll
2004-05-07-UnsizedCastLoad.ll
2004-07-27-ConstantExprMul.ll
2004-08-09-RemInfLoop.ll
2004-08-10-BoolSetCC.ll
2004-09-20-BadLoadCombine2.ll
2004-09-20-BadLoadCombine.ll
2004-09-28-BadShiftAndSetCC.ll
2004-11-22-Missed-and-fold.ll
2004-11-27-SetCCForCastLargerAndConstant.ll
2004-12-08-RemInfiniteLoop.ll
2005-03-04-ShiftOverflow.ll
2005-04-07-UDivSelectCrash.ll
2005-06-15-DivSelectCrash.ll
2005-06-15-ShiftSetCCCrash.ll
2005-06-16-RangeCrash.ll
2005-06-16-SetCCOrSetCCMiscompile.ll
2005-07-07-DeadPHILoop.ll
2006-02-13-DemandedMiscompile.ll
2006-02-28-Crash.ll
2006-03-30-ExtractElement.ll
2006-04-28-ShiftShiftLongLong.ll
2006-05-04-DemandedBitCrash.ll
2006-09-15-CastToBool.ll
2006-10-19-SignedToUnsignedCastAndConst-2.ll
2006-10-20-mask.ll
2006-10-26-VectorReassoc.ll
2006-11-10-ashr-miscompile.ll
2006-12-01-BadFPVectorXform.ll
2006-12-05-fp-to-int-ext.ll
2006-12-08-Phi-ICmp-Op-Fold.ll
2006-12-08-Select-ICmp.ll
2006-12-15-Range-Test.ll
2006-12-23-Select-Cmp-Cmp.ll
2007-01-13-ExtCompareMiscompile.ll
2007-01-14-FcmpSelf.ll
2007-01-18-VectorInfLoop.ll
2007-01-27-AndICmp.ll
2007-02-01-LoadSinkAlloca.ll
2007-02-07-PointerCast.ll
2007-02-23-PhiFoldInfLoop.ll
2007-03-13-CompareMerge.ll
2007-03-19-BadTruncChangePR1261.ll
2007-03-21-SignedRangeTest.ll
2007-03-25-BadShiftMask.ll
2007-03-25-DoubleShift.ll
2007-03-26-BadShiftMask.ll
2007-04-08-SingleEltVectorCrash.ll
2007-05-10-icmp-or.ll
2007-05-14-Crash.ll
2007-05-18-CastFoldBug.ll
2007-06-06-AshrSignBit.ll
2007-06-21-DivCompareMiscomp.ll
2007-08-02-InfiniteLoop.ll
2007-09-10-AliasConstFold.ll
2007-09-17-AliasConstFold2.ll
2007-10-10-EliminateMemCpy.ll
2007-10-12-Crash.ll
2007-10-28-stacksave.ll
2007-10-31-RangeCrash.ll
2007-10-31-StringCrash.ll
2007-11-07-OpaqueAlignCrash.ll
2007-11-15-CompareMiscomp.ll
2007-11-22-IcmpCrash.ll
2007-11-25-CompatibleAttributes.ll
2007-12-10-ConstFoldCompare.ll
2007-12-12-GEPScale.ll
2007-12-16-AsmNoUnwind.ll
2007-12-18-AddSelCmpSub.ll
2007-12-28-IcmpSub2.ll
2008-01-06-BitCastAttributes.ll
2008-01-06-CastCrash.ll
2008-01-06-VoidCast.ll
2008-01-13-AndCmpCmp.ll
2008-01-13-NoBitCastAttributes.ll
2008-01-14-VarArgTrampoline.ll
2008-01-21-MismatchedCastAndCompare.ll
2008-01-21-MulTrunc.ll
2008-01-27-FloatSelect.ll
2008-01-29-AddICmp.ll
2008-02-13-MulURem.ll
2008-02-16-SDivOverflow2.ll
2008-02-23-MulSub.ll
2008-02-28-OrFCmpCrash.ll
2008-03-13-IntToPtr.ll
2008-04-22-ByValBitcast.ll
2008-04-28-VolatileStore.ll
2008-04-29-VolatileLoadDontMerge.ll
2008-04-29-VolatileLoadMerge.ll
2008-05-08-LiveStoreDelete.ll
2008-05-08-StrLenSink.ll
2008-05-09-SinkOfInvoke.ll
2008-05-17-InfLoop.ll
2008-05-18-FoldIntToPtr.ll
2008-05-22-IDivVector.ll
2008-05-22-NegValVector.ll
2008-05-23-CompareFold.ll
2008-05-31-AddBool.ll
2008-05-31-Bools.ll
2008-06-05-ashr-crash.ll
2008-06-08-ICmpPHI.ll
2008-06-13-InfiniteLoopStore.ll
2008-06-13-ReadOnlyCallStore.ll
2008-06-19-UncondLoad.ll
2008-06-21-CompareMiscomp.ll
2008-06-24-StackRestore.ll
2008-07-08-AndICmp.ll
2008-07-08-ShiftOneAndOne.ll
2008-07-08-SubAnd.ll
2008-07-08-VolatileLoadMerge.ll
2008-07-09-SubAndError.ll
2008-07-10-CastSextBool.ll
2008-07-10-ICmpBinOp.ll
2008-07-11-RemAnd.ll
2008-07-13-DivZero.ll
2008-07-16-fsub.ll
2008-07-16-sse2_storel_dq.ll
2008-08-05-And.ll
2008-08-17-ICmpXorSignbit.ll
2008-09-02-VectorCrash.ll
2008-09-29-FoldingOr.ll
2008-10-11-DivCompareFold.ll
2008-10-23-ConstFoldWithoutMask.ll
2008-11-01-SRemDemandedBits.ll
2008-11-08-FCmp.ll
2008-11-20-DivMulRem.ll
2008-11-27-IDivVector.ll
2008-11-27-MultiplyIntVec.ll
2008-11-27-UDivNegative.ll
2008-12-17-SRemNegConstVec.ll
2009-01-05-i128-crash.ll
2009-01-08-AlignAlloca.ll
2009-01-16-PointerAddrSpace.ll
2009-01-19-fmod-constant-float-specials.ll
2009-01-19-fmod-constant-float.ll
2009-01-24-EmptyStruct.ll
2009-01-31-InfIterate.ll
2009-01-31-Pressure.ll
2009-02-04-FPBitcast.ll
2009-02-11-NotInitialized.ll
2009-02-20-InstCombine-SROA.ll
2009-02-21-LoadCST.ll
2009-02-25-CrashZeroSizeArray.ll
2009-03-18-vector-ashr-crash.ll
2009-03-20-AShrOverShift.ll
2009-03-24-InfLoop.ll
2009-04-07-MulPromoteToI96.ll
2009-05-23-FCmpToICmp.ll
2009-06-11-StoreAddrSpace.ll
2009-06-16-SRemDemandedBits.ll
2009-07-02-MaskedIntVector.ll
2009-12-17-CmpSelectNull.ll
2010-01-28-NegativeSRem.ll
2010-03-03-ExtElim.ll
2010-05-30-memcpy-Struct.ll
2010-11-01-lshr-mask.ll
2010-11-21-SizeZeroTypeGEP.ll
2010-11-23-Distributed.ll
2011-02-14-InfLoop.ll
2011-03-08-SRemMinusOneBadOpt.ll
2011-05-02-VectorBoolean.ll
2011-05-13-InBoundsGEP.ll
2011-05-28-swapmulsub.ll
2011-06-13-nsw-alloca.ll
2011-09-03-Trampoline.ll
2011-10-07-AlignPromotion.ll
2012-3-15-or-xor-constant.ll
2012-6-7-vselect-bitcast.ll
2012-01-11-OpaqueBitcastCrash.ll
2012-02-13-FCmp.ll
2012-02-28-ICmp.ll
2012-03-10-InstCombine.ll
2012-04-23-Neon-Intrinsics.ll
2012-04-24-vselect.ll
2012-04-30-SRem.ll
2012-05-27-Negative-Shift-Crash.ll
2012-05-28-select-hang.ll
2012-06-06-LoadOfPHIs.ll
2012-07-25-LoadPart.ll
2012-07-30-addrsp-bitcast.ll
2012-08-28-udiv_ashl.ll
2012-09-17-ZeroSizedAlloca.ll
2012-09-24-MemcpyFromGlobalCrash.ll
2012-10-25-vector-of-pointers.ll
2012-12-14-simp-vgep.ll
2013-03-05-Combine-BitcastTy-Into-Alloca.ll
abs_abs.ll
abs-1.ll
add2.ll
add3.ll
add-shrink.ll
add-sitofp.ll
add.ll
addnegneg.ll
AddOverFlow.ll
addrspacecast.ll
adjust-for-sminmax.ll
alias-recursion.ll
align-2d-gep.ll
align-addr.ll
align-attr.ll
align-external.ll
alloca.ll
and2.ll
and-compare.ll
and-fcmp.ll
and-not-or.ll
and-or-and.ll
and-or-not.ll
and-or.ll
and-xor-merge.ll
and-xor-or.ll
and.ll
apint-add1.ll
apint-add2.ll
apint-and1.ll
apint-and2.ll
apint-and-compare.ll
apint-and-or-and.ll
apint-and-xor-merge.ll
apint-call-cast-target.ll
apint-cast-and-cast.ll
apint-cast-cast-to-and.ll
apint-cast.ll
apint-div1.ll
apint-div2.ll
apint-mul1.ll
apint-mul2.ll
apint-not.ll
apint-or1.ll
apint-or2.ll
apint-rem1.ll
apint-rem2.ll
apint-select.ll
apint-shift-simplify.ll
apint-shift.ll
apint-shl-trunc.ll
apint-sub.ll
apint-xor1.ll
apint-xor2.ll
apint-zext1.ll
apint-zext2.ll
assume2.ll
assume-loop-align.ll
assume-redundant.ll
assume.ll	Revert r228556: InstCombine: propagate nonNull through assume	2015-02-10 08:07:32 +00:00
atomic.ll
badmalloc.ll
binop-cast.ll
bit-checks.ll
bit-tracking.ll
bitcast-alias-function.ll
bitcast-bigendian.ll
bitcast-sext-vector.ll
bitcast-store.ll
bitcast-vec-canon.ll
bitcast-vec-uniform.ll
bitcast-vector-fold.ll
bitcast.ll
bitcount.ll
bittest.ll
blend_x86.ll
bswap-fold.ll
bswap.ll
call2.ll
call-cast-target-inalloca.ll
call-cast-target.ll
call-intrinsics.ll
call.ll
canonicalize_branch.ll
cast_ptr.ll	[InstCombine] Fix a bug when combining `icmp` from `ptrtoint`	2015-02-13 04:51:26 +00:00
cast-call-combine.ll
cast-int-fcmp-eq-0.ll
cast-mul-select.ll
cast-set.ll
cast.ll
ceil.ll
compare-signs.ll
constant-expr-datalayout.ll
constant-fold-address-space-pointer.ll
constant-fold-alias.ll
constant-fold-compare.ll
constant-fold-gep.ll
constant-fold-math.ll
copysign.ll
cos-1.ll
cos-2.ll
CPP_min_max.ll
crash.ll
dce-iterate.ll
deadcode.ll
debug-line.ll
debuginfo.ll
descale-zero.ll
disable-simplify-libcalls.ll
distribute.ll
div-shift-crash.ll
div-shift.ll
div.ll
double-float-shrink-1.ll
double-float-shrink-2.ll
enforce-known-alignment.ll
err-rep-cold.ll
exact.ll
exp2-1.ll
exp2-2.ll
ExtractCast.ll
extractvalue.ll
fabs.ll
fast-math.ll
fcmp-select.ll
fcmp-special.ll
fcmp.ll
fdiv.ll
ffs-1.ll
float-shrink-compare.ll
fmul.ll
fneg-ext.ll
fold-bin-operand.ll
fold-calls.ll
fold-fops-into-selects.ll
fold-phi.ll
fold-sqrt-sqrtf.ll
fold-vector-select.ll
fold-vector-zero.ll
fp-ret-bitcast.ll
fpcast.ll
fpextend_x86.ll
fpextend.ll
fprintf-1.ll
fputs-1.ll
fsub.ll
fwrite-1.ll
gc.relocate.ll	InstCombine: propagate deref via new addDereferenceableAttr	2015-02-14 19:37:54 +00:00
gep-addrspace.ll
gep-sext.ll	[InstCombine] When canonicalizing gep indices, prefer zext when possible	2015-02-14 00:05:36 +00:00
gepgep.ll
gepphigep.ll	[InstCombine] Do not insert a GEP instruction before a landingpad instruction.	2015-02-18 03:30:11 +00:00
getelementptr.ll
hoist_instr.ll
icmp-logical.ll
icmp-range.ll
icmp-shr.ll
icmp.ll
idioms.ll
insert-extract-shuffle.ll
IntPtrCast.ll
intrinsics.ll
invariant.ll
invoke.ll
isascii-1.ll
isdigit-1.ll
JavaCompare.ll
known_align.ll
LandingPadClauses.ll
load3.ll
load-cmp.ll	[InstCombine] Remove unnecessary variable indexing into single-element arrays	2015-02-20 03:05:53 +00:00
load-select.ll
load.ll
loadstore-alignment.ll
loadstore-metadata.ll	[IC] Fix a bug with the instcombine canonicalizing of loads and	2015-02-13 02:30:01 +00:00
logical-select.ll
lshr-phi.ll
malloc-free-delete.ll
maxnum.ll
mem-gep-zidx.ll	[InstCombine] Remove unnecessary variable indexing into single-element arrays	2015-02-20 03:05:53 +00:00
memcmp-1.ll
memcmp-2.ll
memcpy_chk-1.ll
memcpy_chk-2.ll
memcpy-1.ll
memcpy-2.ll
memcpy-from-global.ll
memcpy-to-load.ll
memcpy.ll
memmove_chk-1.ll
memmove_chk-2.ll
memmove-1.ll
memmove-2.ll
memmove.ll
memset2.ll
memset_chk-1.ll
memset_chk-2.ll
memset-1.ll
memset-2.ll
memset.ll
merge-icmp.ll
minnum.ll
mul-masked-bits.ll
mul.ll
multi-size-address-space-pointer.ll
multi-use-or.ll
narrow-switch.ll
narrow.ll
neon-intrinsics.ll
no_cgscc_assert.ll
no-negzero.ll
not-fcmp.ll
not.ll	InstCombine: Allow folding of xor into icmp by changing the predicate for vectors	2015-02-12 20:26:46 +00:00
nothrow.ll
nsw.ll
obfuscated_splat.ll
objsize-64.ll
objsize-address-space.ll
objsize.ll
odr-linkage.ll
onehot_merge.ll
or-fcmp.ll
or-to-xor.ll
or-xor.ll
or.ll
osx-names.ll
overflow-mul.ll
overflow.ll
OverlappingInsertvalues.ll
phi-merge-gep.ll
phi-select-constexpr.ll
phi.ll
pow-1.ll
pow-2.ll
pow-3.ll
pr2645-0.ll
pr2645-1.ll
pr2996.ll
pr8547.ll
pr12251.ll
pr12338.ll
pr17827.ll
pr19420.ll
pr20059.ll
pr20079.ll
pr21199.ll
pr21210.ll
pr21651.ll
pr21891.ll
PR7357.ll
preserve-sminmax.ll
printf-1.ll
printf-2.ll
ptr-int-cast.ll
puts-1.ll
r600-intrinsics.ll
range-check.ll
README.txt
rem.ll
round.ll
sdiv-1.ll
sdiv-2.ll
select-2.ll
select-cmp-br.ll
select-cmp-cttz-ctlz.ll	[InstCombine] Fix regression introduced at r227197.	2015-02-13 16:33:34 +00:00
select-crash.ll
select-extractelement.ll
select-load-call.ll
select-select.ll
select.ll
set.ll
setcc-strength-reduce.ll
sext.ll
shift-sra.ll
shift.ll
shufflemask-undef.ll
shufflevec-constant.ll
sign-test-and-or.ll
signed-comparison.ll
signext.ll
simplify-demanded-bits-pointer.ll
simplify-libcalls.ll
sincospi.ll
sink_instruction.ll
sitofp.ll	InstCombine: fold more cases of (fp_to_u/sint (u/sint_to_fp val))	2015-02-16 21:47:54 +00:00
sprintf-1.ll
sqrt.ll
srem1.ll
srem-simplify-bug.ll
srem.ll
stack-overalign.ll
stacksaverestore.ll
statepoint.ll
store.ll
stpcpy_chk-1.ll
stpcpy_chk-2.ll
stpcpy-1.ll
stpcpy-2.ll
strcat-1.ll
strcat-2.ll
strcat-3.ll
strchr-1.ll
strchr-2.ll
strcmp-1.ll
strcmp-2.ll
strcpy_chk-1.ll
strcpy_chk-2.ll
strcpy_chk-64.ll
strcpy-1.ll
strcpy-2.ll
strcspn-1.ll
strcspn-2.ll
strlen-1.ll
strlen-2.ll
strncat-1.ll
strncat-2.ll
strncat-3.ll
strncmp-1.ll
strncmp-2.ll
strncpy_chk-1.ll
strncpy_chk-2.ll
strncpy-1.ll
strncpy-2.ll
strpbrk-1.ll
strpbrk-2.ll
strrchr-1.ll
strrchr-2.ll
strspn-1.ll
strstr-1.ll
strstr-2.ll
strto-1.ll
struct-assign-tbaa.ll
sub-xor.ll
sub.ll
toascii-1.ll
trunc.ll
udiv_select_to_select_shift.ll
udiv-simplify-bug-0.ll
udiv-simplify-bug-1.ll
udivrem-change-width.ll
unordered-fcmp-select.ll
urem-simplify-bug.ll
urem.ll
vec_demanded_elts.ll
vec_extract_2elts.ll
vec_extract_elt.ll
vec_extract_var_elt.ll
vec_insertelt.ll
vec_narrow.ll
vec_phi_extract.ll
vec_sext.ll
vec_shuffle.ll
vector_gep1.ll
vector_gep2.ll
vector-casts.ll
vector-mul.ll
vector-srem.ll
vector-type.ll
volatile_store.ll
vsx-unaligned.ll
weak-symbols.ll
win-math.ll
x86-crc32-demanded.ll
xor2.ll
xor-undef.ll
xor.ll
zero-point-zero-add.ll
zeroext-and-reduce.ll
zext-bool-add-sub.ll
zext-fold.ll
zext-or-icmp.ll
zext.ll

README.txt

This directory contains test cases for the instcombine transformation.  The
dated tests are actual bug tests, whereas the named tests are used to test
for features that the this pass should be capable of performing.