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974321bd67
Summary: This is a fix for PR23997. The loop vectorizer is not preserving the inbounds property of GEPs that it creates. This is inhibiting some optimizations. This patch preserves the inbounds property in the case where a load/store is being fed by an inbounds GEP. Reviewers: mkuper, javed.absar, hsaito Reviewed By: hsaito Subscribers: dcaballe, hsaito, llvm-commits Differential Revision: https://reviews.llvm.org/D46191 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331269 91177308-0d34-0410-b5e6-96231b3b80d8
75 lines
2.9 KiB
LLVM
75 lines
2.9 KiB
LLVM
; RUN: opt < %s -force-vector-width=4 -force-vector-interleave=2 -loop-vectorize -instcombine -S | FileCheck %s
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; RUN: opt < %s -force-vector-width=4 -force-vector-interleave=2 -loop-vectorize -S | FileCheck %s --check-prefix=NO-IC
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target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
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; CHECK-LABEL: @scalar_after_vectorization_0
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;
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; CHECK: vector.body:
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; CHECK: %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
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; CHECK: %offset.idx = or i64 %index, 1
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; CHECK: %[[T2:.+]] = add nuw nsw i64 %offset.idx, %tmp0
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; CHECK: %[[T3:.+]] = sub nsw i64 %[[T2]], %x
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; CHECK: %[[T4:.+]] = getelementptr inbounds i32, i32* %a, i64 %[[T3]]
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; CHECK: %[[T5:.+]] = bitcast i32* %[[T4]] to <4 x i32>*
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; CHECK: load <4 x i32>, <4 x i32>* %[[T5]], align 4
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; CHECK: %[[T6:.+]] = getelementptr inbounds i32, i32* %[[T4]], i64 4
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; CHECK: %[[T7:.+]] = bitcast i32* %[[T6]] to <4 x i32>*
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; CHECK: load <4 x i32>, <4 x i32>* %[[T7]], align 4
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; CHECK: br {{.*}}, label %middle.block, label %vector.body
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;
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; NO-IC-LABEL: @scalar_after_vectorization_0
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;
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; NO-IC: vector.body:
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; NO-IC: %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
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; NO-IC: %offset.idx = add i64 1, %index
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; NO-IC: %[[T2:.+]] = add i64 %offset.idx, 0
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; NO-IC: %[[T3:.+]] = add i64 %offset.idx, 4
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; NO-IC: %[[T4:.+]] = add nuw nsw i64 %[[T2]], %tmp0
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; NO-IC: %[[T5:.+]] = add nuw nsw i64 %[[T3]], %tmp0
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; NO-IC: %[[T6:.+]] = sub nsw i64 %[[T4]], %x
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; NO-IC: %[[T7:.+]] = sub nsw i64 %[[T5]], %x
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; NO-IC: %[[T8:.+]] = getelementptr inbounds i32, i32* %a, i64 %[[T6]]
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; NO-IC: %[[T9:.+]] = getelementptr inbounds i32, i32* %a, i64 %[[T7]]
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; NO-IC: %[[T10:.+]] = getelementptr inbounds i32, i32* %[[T8]], i32 0
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; NO-IC: %[[T11:.+]] = bitcast i32* %[[T10]] to <4 x i32>*
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; NO-IC: load <4 x i32>, <4 x i32>* %[[T11]], align 4
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; NO-IC: %[[T12:.+]] = getelementptr inbounds i32, i32* %[[T8]], i32 4
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; NO-IC: %[[T13:.+]] = bitcast i32* %[[T12]] to <4 x i32>*
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; NO-IC: load <4 x i32>, <4 x i32>* %[[T13]], align 4
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; NO-IC: br {{.*}}, label %middle.block, label %vector.body
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;
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define void @scalar_after_vectorization_0(i32* noalias %a, i32* noalias %b, i64 %x, i64 %y) {
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outer.ph:
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br label %outer.body
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outer.body:
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%i = phi i64 [ 1, %outer.ph ], [ %i.next, %inner.end ]
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%tmp0 = mul nuw nsw i64 %i, %x
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br label %inner.ph
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inner.ph:
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br label %inner.body
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inner.body:
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%j = phi i64 [ 1, %inner.ph ], [ %j.next, %inner.body ]
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%tmp1 = add nuw nsw i64 %j, %tmp0
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%tmp2 = sub nsw i64 %tmp1, %x
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%tmp3 = getelementptr inbounds i32, i32* %a, i64 %tmp2
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%tmp4 = load i32, i32* %tmp3, align 4
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%tmp5 = getelementptr inbounds i32, i32* %b, i64 %tmp1
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store i32 %tmp4, i32* %tmp5, align 4
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%j.next = add i64 %j, 1
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%cond.j = icmp slt i64 %j.next, %y
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br i1 %cond.j, label %inner.body, label %inner.end
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inner.end:
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%i.next = add i64 %i, 1
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%cond.i = icmp slt i64 %i.next, %y
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br i1 %cond.i, label %outer.body, label %outer.end
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outer.end:
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ret void
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}
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