diff options
Diffstat (limited to 'llvm/test/Transforms/LoopDistribute/bounds-expansion-bug.ll')
-rw-r--r-- | llvm/test/Transforms/LoopDistribute/bounds-expansion-bug.ll | 106 |
1 files changed, 0 insertions, 106 deletions
diff --git a/llvm/test/Transforms/LoopDistribute/bounds-expansion-bug.ll b/llvm/test/Transforms/LoopDistribute/bounds-expansion-bug.ll deleted file mode 100644 index 64104e5c299..00000000000 --- a/llvm/test/Transforms/LoopDistribute/bounds-expansion-bug.ll +++ /dev/null @@ -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 -} |