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