derek.holloway
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54 lines
1.8 KiB
LLVM
54 lines
1.8 KiB
LLVM
; Check that !llvm.loop is not copied from the original loop's latch to the
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; corresponding non-latch branch in any unrolled iteration.
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; DEFINE: %{unroll} = opt < %s -passes=loop-unroll -S
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; DEFINE: %{fc} = FileCheck %s -implicit-check-not='!llvm.loop' -check-prefixes
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; Check partial unroll: only the unrolled loop's latch has !llvm.loop.
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; RUN: %{unroll} -unroll-count=3 | %{fc} UR3
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; UR3: br i1 %c.2, label %body, label %exit, !llvm.loop !0
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; UR3: !0 = distinct !{!0, !1, !2}
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; UR3: !1 = !{!"copied"}
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; UR3: !2 = !{!"llvm.loop.unroll.disable"}
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; Check complete unroll: no !llvm.loop remains because no loop remains.
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; RUN: %{unroll} -unroll-count=4 | %{fc} UR4
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; UR4: br label %exit
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; Check runtime cases: unrolled and remainder loops' latches have !llvm.loop.
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; DEFINE: %{rt} = %{unroll} -unroll-count=3 -unroll-runtime
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; RUN: %{rt} -unroll-runtime-epilog=true | %{fc} EPILOG
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; RUN: %{rt} -unroll-runtime-epilog=false | %{fc} PROLOG
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;
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; EPILOG: br i1 %{{.*}}, label %body, label %exit.unr-lcssa, !llvm.loop !0
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; EPILOG: br i1 {{.*}}, label %body.epil, label %exit.epilog-lcssa, !llvm.loop !3
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; EPILOG: !0 = distinct !{!0, !1, !2}
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; EPILOG: !1 = !{!"copied"}
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; EPILOG: !2 = !{!"llvm.loop.unroll.disable"}
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; EPILOG: !3 = distinct !{!3, !2}
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;
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; PROLOG: br i1 %{{.*}}, label %body.prol, label %body.prol.loopexit.unr-lcssa, !llvm.loop !0
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; PROLOG: br i1 %{{.*}}, label %body, label %exit.unr-lcssa, !llvm.loop !2
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; PROLOG: !0 = distinct !{!0, !1}
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; PROLOG: !1 = !{!"llvm.loop.unroll.disable"}
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; PROLOG: !2 = distinct !{!2, !3, !1}
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; PROLOG: !3 = !{!"copied"}
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define void @test(i32 %n) {
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entry:
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%max = call i32 @llvm.umin.i32(i32 %n, i32 3)
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br label %body
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body:
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%i = phi i32 [ 0, %entry ], [ %inc, %body ]
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%inc = add i32 %i, 1
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%c = icmp ult i32 %i, %max
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br i1 %c, label %body, label %exit, !llvm.loop !0
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exit:
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ret void
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}
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!0 = distinct !{!0, !1}
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!1 = !{!"copied"}
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