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[SCEV] Add coverage for a missing flag inference case

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Philip Reames 2023-03-21 18:34:40 -07:00 committed by Philip Reames
parent d70e7ea0d1
commit c49e56a295
1 changed files with 36 additions and 0 deletions
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36
llvm/test/Analysis/ScalarEvolution/max-backedge-taken-count-guard-info.ll
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@ -1685,3 +1685,39 @@ loop:
exit: exit:
ret i32 0 ret i32 0
} }
; TODO: The pointer induction variable can be implied No Self Wrap.
define void @gep_addrec_nw(ptr %a) {
; CHECK-LABEL: 'gep_addrec_nw'
; CHECK-NEXT: Classifying expressions for: @gep_addrec_nw
; CHECK-NEXT: %lsr.iv1 = phi ptr [ %uglygep2, %for.body ], [ %a, %entry ]
; CHECK-NEXT: --> {%a,+,4}<%for.body> U: full-set S: full-set Exits: (1512 + %a) LoopDispositions: { %for.body: Computable }
; CHECK-NEXT: %lsr.iv = phi i64 [ %lsr.iv.next, %for.body ], [ 379, %entry ]
; CHECK-NEXT: --> {379,+,-1}<nsw><%for.body> U: [1,380) S: [1,380) Exits: 1 LoopDispositions: { %for.body: Computable }
; CHECK-NEXT: %lsr.iv.next = add nsw i64 %lsr.iv, -1
; CHECK-NEXT: --> {378,+,-1}<nsw><%for.body> U: [0,379) S: [0,379) Exits: 0 LoopDispositions: { %for.body: Computable }
; CHECK-NEXT: %uglygep2 = getelementptr i8, ptr %lsr.iv1, i64 4
; CHECK-NEXT: --> {(4 + %a),+,4}<%for.body> U: full-set S: full-set Exits: (1516 + %a) LoopDispositions: { %for.body: Computable }
; CHECK-NEXT: Determining loop execution counts for: @gep_addrec_nw
; CHECK-NEXT: Loop %for.body: backedge-taken count is 378
; CHECK-NEXT: Loop %for.body: constant max backedge-taken count is 378
; CHECK-NEXT: Loop %for.body: symbolic max backedge-taken count is 378
; CHECK-NEXT: Loop %for.body: Predicated backedge-taken count is 378
; CHECK-NEXT: Predicates:
; CHECK: Loop %for.body: Trip multiple is 379
;
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%lsr.iv1 = phi ptr [ %uglygep2, %for.body ], [ %a, %entry ]
%lsr.iv = phi i64 [ %lsr.iv.next, %for.body ], [ 379, %entry ]
store i32 1, ptr %lsr.iv1, align 4
%lsr.iv.next = add nsw i64 %lsr.iv, -1
%uglygep2 = getelementptr i8, ptr %lsr.iv1, i64 4
%exitcond.not = icmp eq i64 %lsr.iv.next, 0
br i1 %exitcond.not, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}