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- ; 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
- }
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