derek.holloway
7502bf64a4
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98 lines
2.2 KiB
LLVM
98 lines
2.2 KiB
LLVM
; RUN: llc -O3 -aarch64-min-jump-table-entries=4 -o - %s | FileCheck %s
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; Test that the output in the presence of an unreachable default does not have
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; a compare and branch at the top of the switch to handle the default case.
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target triple = "aarch64-unknown-linux-gnu"
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; Function Attrs: nounwind
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define void @fn(i4) {
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switch i4 %0, label %default [
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i4 0, label %case_0
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i4 1, label %case_1
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i4 2, label %case_2
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i4 3, label %case_3
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i4 4, label %case_4
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i4 5, label %case_5
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]
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; CHECK-LABEL: fn:
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; CHECK-NOT: sub
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; CHECK-NOT: cmp
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; CHECK-NOT: b.hi
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; CHECK: ldrb {{w[0-9]+}}, [{{x[0-9]+}}, {{x[0-9]+}}]
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; CHECK: add {{x[0-9]+}}, {{x[0-9]+}}, {{x[0-9]+}}, lsl #2
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; CHECK: br {{x[0-9]+}}
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default:
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unreachable
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case_0:
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tail call void @handle_case_00(i4 %0) #2
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br label %return_label
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case_1:
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tail call void @handle_case_01(i4 %0) #2
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br label %return_label
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case_2:
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tail call void @handle_case_02(i4 %0) #2
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br label %return_label
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case_3:
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tail call void @handle_case_03(i4 %0) #2
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br label %return_label
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case_4:
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tail call void @handle_case_04(i4 %0) #2
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br label %return_label
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case_5:
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tail call void @handle_case_05(i4 %0) #2
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br label %return_label
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return_label:
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ret void
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}
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declare void @handle_case_00(i4)
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declare void @handle_case_01(i4)
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declare void @handle_case_02(i4)
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declare void @handle_case_03(i4)
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declare void @handle_case_04(i4)
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declare void @handle_case_05(i4)
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define i32 @reachable_fallthrough(i32 %x) {
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entry:
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switch i32 %x, label %def [
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i32 1, label %bb1
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i32 8, label %bb2
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i32 16, label %bb3
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i32 32, label %bb4
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i32 -64, label %bb5
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]
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; The switch is lowered with a jump table for cases 1--32 and case 64 handled
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; separately. Even though the default of the switch is unreachable, the
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; fall-through for the jump table *is* reachable so the range check must be
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; emitted.
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;
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; CHECK-LABEL: reachable_fallthrough
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; CHECK: sub [[REG:w[0-9]+]], w0, #1
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; CHECK: cmp [[REG]], #31
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; CHECK: b.hi
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def: unreachable
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bb1: br label %return
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bb2: br label %return
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bb3: br label %return
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bb4: br label %return
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bb5: br label %return
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return:
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%p = phi i32 [ 3, %bb1 ], [ 2, %bb2 ], [ 1, %bb3 ], [ 0, %bb4 ], [ 42, %bb5 ]
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ret i32 %p
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}
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