test/ScopInfo/NonAffine/non_affine_conditional_surrounding_affine_loop.ll

; RUN: opt %loadPolly -polly-scops -polly-allow-nonaffine-branches \
; RUN:     -polly-invariant-load-hoisting=true \
; RUN:     -polly-allow-nonaffine-loops=true \
; RUN:     -analyze < %s | FileCheck %s --check-prefix=INNERMOST
; RUN: opt %loadPolly -polly-scops -polly-allow-nonaffine \
; RUN:     -polly-invariant-load-hoisting=true \
; RUN:     -polly-allow-nonaffine-branches -polly-allow-nonaffine-loops=true \
; RUN:     -analyze < %s | FileCheck %s \
; RUN:     --check-prefix=ALL
;
; Negative test for INNERMOST.
; At the moment we will optimistically assume A[i] in the conditional before the inner
; loop might be invariant and expand the SCoP from the loop to include the conditional. However,
; during SCoP generation we will realize that A[i] is in not always invariant.
;
; Possible solutions could be:
;   - Do not optimistically assume it to be invariant (as before this commit), however we would loose
;     a lot of invariant cases due to possible aliasing.
;   - Reduce the size of the SCoP if an assumed invariant access is in fact not invariant instead of
;     rejecting the whole region.
;
; INNERMOST:         Function: f
; INNERMOST-NEXT:    Region: %bb4---%bb3
; INNERMOST-NEXT:    Max Loop Depth:  1
; INNERMOST-NEXT:    Invariant Accesses: {
; INNERMOST-NEXT:            ReadAccess :=	[Reduction Type: NONE] [Scalar: 0]
; INNERMOST-NEXT:                [tmp6, N, p_2] -> { Stmt_bb4[] -> MemRef_A[p_2] };
; INNERMOST-NEXT:            Execution Context: [tmp6, N, p_2] -> { : (tmp6 > 0 and p_2 >= N) or (tmp6 < 0 and p_2 >= N) or tmp6 = 0 }
; INNERMOST-NEXT:    }
; INNERMOST-NEXT:    Context:
; INNERMOST-NEXT:    [tmp6, N, p_2] -> {  : -2147483648 <= tmp6 <= 2147483647 and -2147483648 <= N <= 2147483647 and 0 <= p_2 <= 1024 }
; INNERMOST-NEXT:    Assumed Context:
; INNERMOST-NEXT:    [tmp6, N, p_2] -> {  :  }
; INNERMOST-NEXT:    Invalid Context:
; INNERMOST-NEXT:    [tmp6, N, p_2] -> {  : p_2 < N and (tmp6 < 0 or tmp6 > 0) }
; INNERMOST-NEXT:    p0: %tmp6
; INNERMOST-NEXT:    p1: %N
; INNERMOST-NEXT:    p2: {0,+,1}<nuw><nsw><%bb3>
; INNERMOST-NEXT:    Arrays {
; INNERMOST-NEXT:        i32 MemRef_A[*]; // Element size 4
; INNERMOST-NEXT:        i64 MemRef_indvars_iv_next2; // Element size 8
; INNERMOST-NEXT:    }
; INNERMOST-NEXT:    Arrays (Bounds as pw_affs) {
; INNERMOST-NEXT:        i32 MemRef_A[*]; // Element size 4
; INNERMOST-NEXT:        i64 MemRef_indvars_iv_next2; // Element size 8
; INNERMOST-NEXT:    }
; INNERMOST-NEXT:    Alias Groups (0):
; INNERMOST-NEXT:        n/a
; INNERMOST-NEXT:    Statements {
; INNERMOST-NEXT:    	Stmt_bb11
; INNERMOST-NEXT:            Domain :=
; INNERMOST-NEXT:                [tmp6, N, p_2] -> { Stmt_bb11[i0] : 0 <= i0 < N and (tmp6 < 0 or tmp6 > 0) };
; INNERMOST-NEXT:            Schedule :=
; INNERMOST-NEXT:                [tmp6, N, p_2] -> { Stmt_bb11[i0] -> [0, i0] : tmp6 < 0 or tmp6 > 0 };
; INNERMOST-NEXT:            ReadAccess :=	[Reduction Type: +] [Scalar: 0]
; INNERMOST-NEXT:                [tmp6, N, p_2] -> { Stmt_bb11[i0] -> MemRef_A[i0] };
; INNERMOST-NEXT:            MustWriteAccess :=	[Reduction Type: +] [Scalar: 0]
; INNERMOST-NEXT:                [tmp6, N, p_2] -> { Stmt_bb11[i0] -> MemRef_A[i0] };
; INNERMOST-NEXT:    	Stmt_bb18
; INNERMOST-NEXT:            Domain :=
; INNERMOST-NEXT:                [tmp6, N, p_2] -> { Stmt_bb18[] };
; INNERMOST-NEXT:            Schedule :=
; INNERMOST-NEXT:                [tmp6, N, p_2] -> { Stmt_bb18[] -> [1, 0] };
; INNERMOST-NEXT:            MustWriteAccess :=	[Reduction Type: NONE] [Scalar: 1]
; INNERMOST-NEXT:                [tmp6, N, p_2] -> { Stmt_bb18[] -> MemRef_indvars_iv_next2[] };
; INNERMOST-NEXT:    }
;
; ALL:      Function: f
; ALL-NEXT: Region: %bb3---%bb19
; ALL-NEXT: Max Loop Depth:  1
; ALL-NEXT: Invariant Accesses: {
; ALL-NEXT: }
; ALL-NEXT: Context:
; ALL-NEXT: {  :  }
; ALL-NEXT: Assumed Context:
; ALL-NEXT: {  :  }
; ALL-NEXT: Invalid Context:
; ALL-NEXT: {  : false }
; ALL-NEXT: Arrays {
; ALL-NEXT:     i32 MemRef_A[*]; // Element size 4
; ALL-NEXT: }
; ALL-NEXT: Arrays (Bounds as pw_affs) {
; ALL-NEXT:     i32 MemRef_A[*]; // Element size 4
; ALL-NEXT: }
; ALL-NEXT: Alias Groups (0):
; ALL-NEXT:     n/a
; ALL-NEXT: Statements {
; ALL-NEXT:     Stmt_bb4__TO__bb17
; ALL-NEXT:         Domain :=
; ALL-NEXT:             { Stmt_bb4__TO__bb17[i0] : 0 <= i0 <= 1023 };
; ALL-NEXT:         Schedule :=
; ALL-NEXT:             { Stmt_bb4__TO__bb17[i0] -> [i0] };
; ALL-NEXT:         ReadAccess :=    [Reduction Type: NONE] [Scalar: 0]
; ALL-NEXT:             { Stmt_bb4__TO__bb17[i0] -> MemRef_A[i0] };
; ALL-NEXT:         ReadAccess :=    [Reduction Type: NONE] [Scalar: 0]
; ALL-NEXT:             { Stmt_bb4__TO__bb17[i0] -> MemRef_A[o0] : 0 <= o0 <= 2147483647 };
; ALL-NEXT:         MayWriteAccess :=    [Reduction Type: NONE] [Scalar: 0]
; ALL-NEXT:             { Stmt_bb4__TO__bb17[i0] -> MemRef_A[o0] : 0 <= o0 <= 2147483647 };
; ALL-NEXT: }
;
;    void f(int *A, int N) {
;      for (int i = 0; i < 1024; i++)
;        if (A[i])
;          for (int j = 0; j < N; j++)
;            A[j]++;
;    }
;
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"

define void @f(i32* %A, i32 %N) {
bb:
  %tmp = sext i32 %N to i64
  br label %bb3

bb3:                                              ; preds = %bb18, %bb
  %indvars.iv1 = phi i64 [ %indvars.iv.next2, %bb18 ], [ 0, %bb ]
  %exitcond = icmp ne i64 %indvars.iv1, 1024
  br i1 %exitcond, label %bb4, label %bb19

bb4:                                              ; preds = %bb3
  %tmp5 = getelementptr inbounds i32, i32* %A, i64 %indvars.iv1
  %tmp6 = load i32, i32* %tmp5, align 4
  %tmp7 = icmp eq i32 %tmp6, 0
  br i1 %tmp7, label %bb17, label %bb8

bb8:                                              ; preds = %bb4
  br label %bb9

bb9:                                              ; preds = %bb15, %bb8
  %indvars.iv = phi i64 [ %indvars.iv.next, %bb15 ], [ 0, %bb8 ]
  %tmp10 = icmp slt i64 %indvars.iv, %tmp
  br i1 %tmp10, label %bb11, label %bb16

bb11:                                             ; preds = %bb9
  %tmp12 = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
  %tmp13 = load i32, i32* %tmp12, align 4
  %tmp14 = add nsw i32 %tmp13, 1
  store i32 %tmp14, i32* %tmp12, align 4
  br label %bb15

bb15:                                             ; preds = %bb11
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  br label %bb9

bb16:                                             ; preds = %bb9
  br label %bb17

bb17:                                             ; preds = %bb4, %bb16
  br label %bb18

bb18:                                             ; preds = %bb17
  %indvars.iv.next2 = add nuw nsw i64 %indvars.iv1, 1
  br label %bb3

bb19:                                             ; preds = %bb3
  ret void
}