llvm-project

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; RUN: opt %loadNPMPolly -passes=polly-codegen -S -verify-dom-info \
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; RUN:     < %s | FileCheck %s
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;
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; Check that we do not reuse the B[i-1] GEP created in block S again in
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; block Q. Hence, we create two GEPs for B[i-1]:
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;
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; CHECK:  %scevgep{{.}} = getelementptr i8, ptr %B, i64 -4
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; CHECK:  %scevgep{{.}} = getelementptr i8, ptr %B, i64 -4
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;
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;    void f(int *A, int *B) {
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;      int x = 0;
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;      for (int i = 0; i < 1024; i++) {
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;        if (A[i]) {
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;          if (i > 512)
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; S:         A[i] = B[i - 1];
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; Q:       A[i] += B[i - 1];
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;        }
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;      }
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;    }
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;
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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define void @f(ptr %A, ptr %B) {
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bb:
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  br label %bb1
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bb1:                                              ; preds = %bb22, %bb
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  %indvars.iv = phi i64 [ %indvars.iv.next, %bb22 ], [ 0, %bb ]
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  %exitcond = icmp ne i64 %indvars.iv, 1024
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  br i1 %exitcond, label %bb2, label %bb23
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bb2:                                              ; preds = %bb1
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  %tmp = getelementptr inbounds i32, ptr %A, i64 %indvars.iv
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  %tmp3 = load i32, ptr %tmp, align 4
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  %tmp4 = icmp eq i32 %tmp3, 0
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  br i1 %tmp4, label %bb21, label %bb5
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bb5:                                              ; preds = %bb2
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  %tmp6 = icmp sgt i64 %indvars.iv, 512
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  br i1 %tmp6, label %bb7, label %bb13
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bb7:                                              ; preds = %bb5
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  br label %bb8
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bb8:                                              ; preds = %bb7
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  %tmp9 = add nsw i64 %indvars.iv, -1
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  %tmp10 = getelementptr inbounds i32, ptr %B, i64 %tmp9
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  %tmp11 = load i32, ptr %tmp10, align 4
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  %tmp12 = getelementptr inbounds i32, ptr %A, i64 %indvars.iv
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  store i32 %tmp11, ptr %tmp12, align 4
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  br label %bb13
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bb13:                                             ; preds = %bb8, %bb5
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  br label %bb14
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bb14:                                             ; preds = %bb13
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  %tmp15 = add nsw i64 %indvars.iv, -1
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  %tmp16 = getelementptr inbounds i32, ptr %B, i64 %tmp15
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  %tmp17 = load i32, ptr %tmp16, align 4
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  %tmp18 = getelementptr inbounds i32, ptr %A, i64 %indvars.iv
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  %tmp19 = load i32, ptr %tmp18, align 4
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  %tmp20 = add nsw i32 %tmp19, %tmp17
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  store i32 %tmp20, ptr %tmp18, align 4
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  br label %bb21
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bb21:                                             ; preds = %bb2, %bb14
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  br label %bb22
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bb22:                                             ; preds = %bb21
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  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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  br label %bb1
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bb23:                                             ; preds = %bb1
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  ret void
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}
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