Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/test/Transforms/LoopDistribute/bounds-expansion-bug.ll

@@ -1,106 +0,0 @@
-; RUN: opt -basicaa -loop-distribute -enable-loop-distribute -S < %s | FileCheck %s
-
-; When emitting the memchecks for:
-;
-;   for (i = 0; i < n; i++) {
-;     A[i + 1] = A[i] * B[i];
-;     =======================
-;     C[i] = D[i] * E[i];
-;   }
-;
-; we had a bug when expanding the bounds for A and C.  These are expanded
-; multiple times and rely on the caching in SCEV expansion to avoid any
-; redundancy.  However, due to logic in SCEVExpander::ReuseOrCreateCast, we
-; can get earlier expanded values invalidated when casts are used.  This test
-; ensure that we are not using the invalidated values.
-
-target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
-
-define void @f(i32* %a1, i32* %a2,
-               i32* %b,
-               i32* %c1, i32* %c2,
-               i32* %d,
-               i32* %e) {
-entry:
-
-  %cond = icmp eq i32* %e, null
-  br i1 %cond, label %one, label %two
-one:
-  br label %join
-two:
-  br label %join
-join:
-
-; The pointers need to be defined by PHIs in order for the bug to trigger.
-; Because of the PHIs the existing casts won't be at the desired location so a
-; new cast will be emitted and the old cast will get invalidated.
-;
-; These are the steps:
-;
-; 1. After the bounds for A and C are first expanded:
-;
-;   join:
-;     %a = phi i32* [ %a1, %one ], [ %a2, %two ]
-;     %c = phi i32* [ %c1, %one ], [ %c2, %two ]
-;     %c5 = bitcast i32* %c to i8*
-;     %a3 = bitcast i32* %a to i8*
-;
-; 2. After A is expanded again:
-;
-;   join:                                             ; preds = %two, %one
-;     %a = phi i32* [ %a1, %one ], [ %a2, %two ]
-;     %c = phi i32* [ %c1, %one ], [ %c2, %two ]
-;     %a3 = bitcast i32* %a to i8*                   <--- new
-;     %c5 = bitcast i32* %c to i8*
-;     %0 = bitcast i32* undef to i8*                 <--- old, invalidated
-;
-; 3. Finally, when C is expanded again:
-;
-;   join:                                             ; preds = %two, %one
-;     %a = phi i32* [ %a1, %one ], [ %a2, %two ]
-;     %c = phi i32* [ %c1, %one ], [ %c2, %two ]
-;     %c5 = bitcast i32* %c to i8*                   <--- new
-;     %a3 = bitcast i32* %a to i8*
-;     %0 = bitcast i32* undef to i8*                 <--- old, invalidated
-;     %1 = bitcast i32* undef to i8*
-
-  %a = phi i32* [%a1, %one], [%a2, %two]
-  %c = phi i32* [%c1, %one], [%c2, %two]
-  br label %for.body
-
-
-; CHECK: [[VALUE:%[0-9a-z]+]] = bitcast i32* undef to i8*
-; CHECK-NOT: [[VALUE]]
-
-for.body:                                         ; preds = %for.body, %entry
-  %ind = phi i64 [ 0, %join ], [ %add, %for.body ]
-
-  %arrayidxA = getelementptr inbounds i32, i32* %a, i64 %ind
-  %loadA = load i32, i32* %arrayidxA, align 4
-
-  %arrayidxB = getelementptr inbounds i32, i32* %b, i64 %ind
-  %loadB = load i32, i32* %arrayidxB, align 4
-
-  %mulA = mul i32 %loadB, %loadA
-
-  %add = add nuw nsw i64 %ind, 1
-  %arrayidxA_plus_4 = getelementptr inbounds i32, i32* %a, i64 %add
-  store i32 %mulA, i32* %arrayidxA_plus_4, align 4
-
-  %arrayidxD = getelementptr inbounds i32, i32* %d, i64 %ind
-  %loadD = load i32, i32* %arrayidxD, align 4
-
-  %arrayidxE = getelementptr inbounds i32, i32* %e, i64 %ind
-  %loadE = load i32, i32* %arrayidxE, align 4
-
-  %mulC = mul i32 %loadD, %loadE
-
-  %arrayidxC = getelementptr inbounds i32, i32* %c, i64 %ind
-  store i32 %mulC, i32* %arrayidxC, align 4
-
-  %exitcond = icmp eq i64 %add, 20
-  br i1 %exitcond, label %for.end, label %for.body
-
-for.end:                                          ; preds = %for.body
-  ret void
-}