Besides breaking up a 700 line function to improve readability,
this sinks the 'FIXME: ConstantInt' check into each helper. So
now we can independently break that restriction within any of the
helper functions.
As much as possible, the code was only {cut/paste/clang-format}'ed
to minimize risk (no functional changes intended), so several more
readability improvements are still possible.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278828 91177308-0d34-0410-b5e6-96231b3b80d8
There's some formatting and pointer deref ugliness here that I intend to fix in
subsequent patches. The overall goal is to refactor the obnoxiously long switch
and incrementally remove the restriction to scalar types (allow folds for vector
splats). This patch introduces the use of m_APInt which means the RHSV reference
is now a pointer (and may have matched a vector splat), but the check of 'RHS'
remains, so vector folds are disallowed and no functional change is intended.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278816 91177308-0d34-0410-b5e6-96231b3b80d8
This is part of an effort to constify ValueTracking.cpp. This change is
to methods which need const Value* instead of Value* to go with the upcoming
changes to ValueTracking.
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I'm removing a misplaced pair of more specific folds from InstCombine in this patch as well,
so we know where those folds are happening in InstSimplify.
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This removes the restriction for the icmp constant, but as noted by the FIXME comments,
we still need to change individual checks for binop operand constants.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@277629 91177308-0d34-0410-b5e6-96231b3b80d8
Almost all of these folds require changes to allow vector types.
Splitting up the logic should make that easier to do incrementally.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276360 91177308-0d34-0410-b5e6-96231b3b80d8
Making smaller pieces out of some of these ~1000 line functions should make
it easier to incrementally upgrade them to handle vector types.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276304 91177308-0d34-0410-b5e6-96231b3b80d8
As suggested by clang-tidy's performance-unnecessary-copy-initialization.
This can easily hit lifetime issues, so I audited every change and ran the
tests under asan, which came back clean.
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In r271810 ( http://reviews.llvm.org/rL271810 ), I loosened the check
above this to work for any Constant rather than ConstantInt. AFAICT,
that part makes sense if we can determine that the shrunken/extended
constant remained equal. But it doesn't make sense for this later
transform where we assume that the constant DID change.
This could assert for a ConstantExpr:
https://llvm.org/bugs/show_bug.cgi?id=28011
And it could be wrong for a vector as shown in the added regression test.
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Change the name of the ICmpInst to 'ICmp' and the Constant (was a ConstantInt) to 'C',
so that it's hopefully clearer that 'CI' refers to CastInst in this context.
While we're scrubbing, fix the documentation comment and use 'auto' with 'dyn_cast'.
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This bug was introduced in r269728 and is the likely cause of many stage 2 ubsan bot failures.
I'll add a test in a follow-up commit assuming this fixes things properly.
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Fix a bug introduced with rL269426 :
[InstCombine] canonicalize* LE/GE vector integer comparisons to LT/GT (PR26701, PR26819)
We were assuming that a ConstantDataVector / ConstantVector / ConstantAggregateZero operand of
an ICMP was composed of ConstantInt elements, but it might have ConstantExpr or UndefValue
elements. Handle those appropriately.
Also, refactor this function to join the scalar and vector paths and eliminate the switches.
Differential Revision: http://reviews.llvm.org/D20289
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*We don't currently handle the edge case constants (min/max values), so it's not a complete
canonicalization.
To fully solve the motivating bugs, we need to enhance this to recognize a zero vector
too because that's a ConstantAggregateZero which is a ConstantData, not a ConstantVector
or a ConstantDataVector.
Differential Revision: http://reviews.llvm.org/D17859
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This reapplies commit r268521, that was reverted in r268530 due to a test failure in select-implied.ll
Modified the test case to reflect the new change.
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The functionality contained within getIntrinsicIDForCall is two-fold: it
checks if a CallInst's callee is a vectorizable intrinsic. If it isn't
an intrinsic, it attempts to map the call's target to a suitable
intrinsic.
Move the mapping functionality into getIntrinsicForCallSite and rename
getIntrinsicIDForCall to getVectorIntrinsicIDForCall while
reimplementing it in terms of getIntrinsicForCallSite.
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InstCombine wants to optimize compares of calls to fabs with zero.
However, we didn't have the necessary legality checking to verify that
the function call had the same behavior as fabs.
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https://llvm.org/bugs/show_bug.cgi?id=27105
We can check if all bits outside of a constant mask are set with a
single constant.
As noted in the bug report, although this form should be considered the
canonical IR, backends may want to transform this into an 'andn' / 'andc'
comparison against zero because that could be a single machine instruction.
Differential Revision: http://reviews.llvm.org/D18842
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Remove an ad-hoc transform in InstCombine and replace it with more
general machinery (ValueTracking, InstructionSimplify and VectorUtils).
This fixes PR27332.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266175 91177308-0d34-0410-b5e6-96231b3b80d8
Extract out a generic interface from a recently landed patch and document a TODO in case compile time becomes a problem.
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