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338b822ab9
The patch disabled unrolling in loop vectorization pass when VF==1 on x86 architecture, by setting MaxInterleaveFactor to 1. Unrolling in loop vectorization pass may introduce the cost of overflow check, memory boundary check and extra prologue/epilogue code when regular unroller will unroll the loop another time. Disable it when VF==1 remove the unnecessary cost on x86. The same can be done for other platforms after verifying interleaving/memory bound checking to be not perf critical on those platforms. Differential Revision: http://reviews.llvm.org/D9515 llvm-svn: 236613
38 lines
1.2 KiB
LLVM
38 lines
1.2 KiB
LLVM
; This test makes sure that loop will not be unrolled in vectorization if VF computed
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; equals to 1.
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; RUN: opt < %s -loop-vectorize -S | FileCheck %s
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; Make sure there are no geps being merged.
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; CHECK-LABEL: @foo(
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; CHECK: getelementptr
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; CHECK-NOT: getelementptr
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@N = common global i32 0, align 4
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@a = common global [1000 x i32] zeroinitializer, align 16
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define void @foo() #0 {
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entry:
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%0 = load i32, i32* @N, align 4
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%cmp5 = icmp sgt i32 %0, 0
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br i1 %cmp5, label %for.body.lr.ph, label %for.end
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for.body.lr.ph: ; preds = %entry
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%conv = sext i32 %0 to i64
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br label %for.body
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for.body: ; preds = %for.body.lr.ph, %for.body
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%i.06 = phi i64 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
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%mul = mul nuw nsw i64 %i.06, 7
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%arrayidx = getelementptr inbounds [1000 x i32], [1000 x i32]* @a, i64 0, i64 %mul
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store i32 3, i32* %arrayidx, align 4
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%inc = add nuw nsw i64 %i.06, 1
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%cmp = icmp slt i64 %inc, %conv
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br i1 %cmp, label %for.body, label %for.end.loopexit
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for.end.loopexit: ; preds = %for.body
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br label %for.end
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for.end: ; preds = %for.end.loopexit, %entry
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ret void
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}
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