diff options
Diffstat (limited to 'test')
| -rw-r--r-- | test/Analysis/ScalarEvolution/scev-invalid.ll | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/test/Analysis/ScalarEvolution/scev-invalid.ll b/test/Analysis/ScalarEvolution/scev-invalid.ll new file mode 100644 index 0000000000..aac0d319ae --- /dev/null +++ b/test/Analysis/ScalarEvolution/scev-invalid.ll @@ -0,0 +1,34 @@ +; RUN: opt < %s -S -indvars -loop-unroll | FileCheck %s +; +; PR15570: SEGV: SCEV back-edge info invalid after dead code removal. +; +; Indvars creates a SCEV expression for the loop's back edge taken +; count, then determines that the comparison is always true and +; removes it. +; +; When loop-unroll asks for the expression, it contains a NULL +; SCEVUnknkown (as a CallbackVH). +; +; forgetMemoizedResults should invalidate the backedge taken count expression. + +; CHECK: @test +; CHECK-NOT: phi +; CHECK-NOT: icmp +; CHECK: ret void +define void @test() { +entry: + %xor1 = xor i32 0, 1 + br label %b17 + +b17: + br i1 undef, label %b22, label %b18 + +b18: + %phi1 = phi i32 [ %add1, %b18 ], [ %xor1, %b17 ] + %add1 = add nsw i32 %phi1, -1 + %cmp1 = icmp sgt i32 %add1, 0 + br i1 %cmp1, label %b18, label %b22 + +b22: + ret void +} |