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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes='loop(indvars),loop-vectorize' -S %s | FileCheck %s
target triple = "x86_64-unknown-linux-gnu"
; After indvars, the backedge taken count for %loop2 becomes 1, but SCEV
; retains the cached original BTC, as the loop is in dead code. Make sure
; LV does not crash when trying to select an interleave count for a loop with zero cost.
define void @pr54413(i64* %ptr.base) {
; CHECK-LABEL: @pr54413(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[LOOP1:%.*]]
; CHECK: loop1:
; CHECK-NEXT: br i1 true, label [[LOOP1_LATCH:%.*]], label [[LOOP2_PREHEADER:%.*]]
; CHECK: loop2.preheader:
; CHECK-NEXT: br label [[LOOP2:%.*]]
; CHECK: loop2:
; CHECK-NEXT: [[PTR_NEXT:%.*]] = getelementptr inbounds i64, i64* [[PTR_BASE:%.*]], i64 1
; CHECK-NEXT: br i1 true, label [[LOOP2_EXIT:%.*]], label [[LOOP2]]
; CHECK: loop2.exit:
; CHECK-NEXT: [[PTR_NEXT_LCSSA:%.*]] = phi i64* [ [[PTR_NEXT]], [[LOOP2]] ]
; CHECK-NEXT: br label [[LOOP1_LATCH]]
; CHECK: loop1.latch:
; CHECK-NEXT: br label [[LOOP1]]
;
entry:
br label %loop1
loop1:
br i1 true, label %loop1.latch, label %loop2.preheader
loop2.preheader:
br label %loop2
loop2:
%iv = phi i64 [ 0, %loop2.preheader ], [ %iv.next, %loop2 ]
%ptr = phi i64* [ %ptr.base, %loop2.preheader ], [ %ptr.next, %loop2 ]
%iv.next = add nuw nsw i64 %iv, 1
%ptr.next = getelementptr inbounds i64, i64* %ptr, i64 1
%cmp = icmp eq i64 %iv, 1024
br i1 %cmp, label %loop2.exit, label %loop2
loop2.exit:
%ptr.next.lcssa = phi i64* [ %ptr.next, %loop2 ]
br label %loop1.latch
loop1.latch:
br label %loop1
}
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