derek.holloway
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72 lines
2.9 KiB
LLVM
72 lines
2.9 KiB
LLVM
; RUN: opt < %s -S -passes='print<scalar-evolution>,loop-unroll<peeling;full-unroll-max=0>,print<scalar-evolution>' 2>&1 | FileCheck %s
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;
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; This test ensures that (extractvalue 0 (with-overflow-inst op0, op1))
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; is invalidated by LoopPeel when the operands of with-overflow-inst
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; are changed.
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;
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; In the following case, LoopPeel modifies the CFG into another one
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; with %bb7 not dominating %bb2 and %bb3 although %extractvalue is
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; still the step for the %bb3 loop. %call has been modified and uses
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; different operands but the SCEV value for %extractvalue has not been
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; invalidated and still refers to %load in its SCEV operands
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; (SCEV(%extractvalue) := -2 + -2 * %load).
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;
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; When LoopUnroll tries to compute the SCEV for the %bb3 Phi, the
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; stale data for %extractvalue is used whereas %load is not available
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; in %bb3 which is wrong.
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;
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; for more details and nice pictures: https://github.com/llvm/llvm-project/issues/97586
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;
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; Although the reason for the bug was in forgetValue, it is still relevant to
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; test if LoopPeel invalidates %extractvalue after changing %call.
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;
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; forgetValue only walks the users, so calling it on the IV Phis does not
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; invalidate %extractvalue (thus forgetLoop does not invalidate it too).
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; It has to be done by LoopPeel itself.
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define void @loop_peeling_smul_with_overflow() {
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; before loop-unroll
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; CHECK: Classifying expressions for: @loop_peeling_smul_with_overflow
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; CHECK: %extractvalue = extractvalue { i32, i1 } %call, 0
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; CHECK-NEXT: --> (-2 + (-2 * %load))
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; CHECK: %phi4 = phi i32 [ %add, %bb3 ], [ 0, %bb2 ]
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; CHECK-NEXT: --> {0,+,(-2 + (-2 * %load))}<nuw><nsw><%bb3>
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; after loop-unroll
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; CHECK: Classifying expressions for: @loop_peeling_smul_with_overflow
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; CHECK: %extractvalue = extractvalue { i32, i1 } %call, 0
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; CHECK-NEXT: --> (-2 * %add8.lcssa)
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; CHECK: %phi4 = phi i32 [ %add, %bb3 ], [ 0, %bb2 ]
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; CHECK-NEXT: --> {0,+,(-2 * %add8.lcssa)}<nuw><nsw><%bb3>
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;
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bb:
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br label %bb1
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bb1: ; preds = %bb3, %bb
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%phi = phi i32 [ 0, %bb ], [ %phi4, %bb3 ]
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br label %bb5
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bb2: ; preds = %bb7
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%call = call { i32, i1 } @llvm.smul.with.overflow.i32(i32 %add8, i32 -2)
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%extractvalue = extractvalue { i32, i1 } %call, 0
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br label %bb3
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bb3: ; preds = %bb3, %bb2
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%phi4 = phi i32 [ %add, %bb3 ], [ 0, %bb2 ]
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%add = add i32 %extractvalue, %phi4
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br i1 false, label %bb3, label %bb1
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bb5: ; preds = %bb7, %bb1
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%phi6 = phi i32 [ 1, %bb1 ], [ 0, %bb7 ]
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%icmp = icmp eq i32 %phi, 0
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br i1 %icmp, label %bb9, label %bb7
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bb7: ; preds = %bb5
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%load = load i32, ptr addrspace(1) null, align 4
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%add8 = add i32 %load, 1
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br i1 false, label %bb2, label %bb5
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bb9: ; preds = %bb5
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ret void
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}
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