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[LV] Enable Histogram autovectorization by default #158292

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[LV] Enable Histogram autovectorization by default #158292

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2 changes: 1 addition & 1 deletion llvm/lib/Transforms/Vectorize/LoopVectorizationLegality.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -80,7 +80,7 @@ static cl::opt<LoopVectorizeHints::ScalableForceKind>
"cost is inconclusive.")));

static cl::opt<bool> EnableHistogramVectorization(
"enable-histogram-loop-vectorization", cl::init(false), cl::Hidden,
"enable-histogram-loop-vectorization", cl::init(true), cl::Hidden,
cl::desc("Enables autovectorization of some loops containing histograms"));

/// Maximum vectorization interleave count.
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4 changes: 1 addition & 3 deletions llvm/test/Transforms/LoopVectorize/increment.ll
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Expand Up @@ -33,13 +33,11 @@ define void @inc(i32 %n) nounwind uwtable noinline ssp {
ret void
}

; Can't vectorize this loop because the access to A[X] is non-linear.
;
; for (i = 0; i < n; ++i) {
; A[B[i]]++;
;
;CHECK-LABEL: @histogram(
;CHECK-NOT: <4 x i32>
;CHECK: call void @llvm.experimental.vector.histogram.add.v4p0.i32(<4 x ptr> %{{.*}}, i32 1, <4 x i1> splat (i1 true))
;CHECK: ret i32
define i32 @histogram(ptr nocapture noalias %A, ptr nocapture noalias %B, i32 %n) nounwind uwtable ssp {
entry:
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