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[InstCombine] add control for SimplifyDemandedVectorElts depth limit #113717

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Merged
merged 2 commits into from
Nov 9, 2024
Merged

[InstCombine] add control for SimplifyDemandedVectorElts depth limit #113717

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[InstCombine] add control for SimplifyDemandedVectorElts depth limit
Prince781 Oct 3, 2024
c137913
Merge branch 'main' into dev/pferro/simplify-demanded-vector-elts-dep…
Prince781 Nov 2, 2024
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8 changes: 7 additions & 1 deletion llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,12 @@ static cl::opt<bool>
"SimplifyDemandedBits() are consistent"),
cl::Hidden, cl::init(false));

static cl::opt<unsigned> SimplifyDemandedVectorEltsDepthLimit(
"instcombine-simplify-vector-elts-depth",
cl::desc(
"Depth limit when simplifying vector instructions and their operands"),
cl::Hidden, cl::init(10));

/// Check to see if the specified operand of the specified instruction is a
/// constant integer. If so, check to see if there are any bits set in the
/// constant that are not demanded. If so, shrink the constant and return true.
Expand Down Expand Up @@ -1432,7 +1438,7 @@ Value *InstCombinerImpl::SimplifyDemandedVectorElts(Value *V,
}

// Limit search depth.
if (Depth == 10)
if (Depth == SimplifyDemandedVectorEltsDepthLimit)
return nullptr;

if (!AllowMultipleUsers) {
Expand Down
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