93 lines
2.0 KiB
LLVM
93 lines
2.0 KiB
LLVM
; RUN: llc -mtriple=i686-pc-gnu-linux < %s | FileCheck %s
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; RUN: llc -mtriple=i686-pc-gnu-linux -print-after=finalize-isel %s -o /dev/null 2>&1 | FileCheck %s -check-prefix=CHECK-JT-PROB
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; An unreachable default destination is ignored and no compare and branch
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; is generated for the default values.
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define void @foo(i32 %x, ptr %to) {
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; CHECK-LABEL: foo:
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; CHECK: movl 4(%esp), [[REG:%e[a-z]{2}]]
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; CHECK-NEXT: jmpl *.LJTI0_0(,[[REG]],4)
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; CHECK: movl $4
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; CHECK: retl
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entry:
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switch i32 %x, label %default [
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i32 0, label %bb0
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i32 1, label %bb1
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i32 2, label %bb2
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i32 3, label %bb3
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i32 4, label %bb4
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i32 5, label %bb4
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]
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bb0:
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store i32 0, ptr %to
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br label %exit
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bb1:
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store i32 1, ptr %to
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br label %exit
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bb2:
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store i32 2, ptr %to
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br label %exit
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bb3:
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store i32 3, ptr %to
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br label %exit
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bb4:
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store i32 4, ptr %to
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br label %exit
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exit:
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ret void
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default:
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unreachable
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; The jump table has four entries.
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; CHECK-LABEL: .LJTI0_0:
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; CHECK-NEXT: .long .LBB0_1
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; CHECK-NEXT: .long .LBB0_2
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; CHECK-NEXT: .long .LBB0_3
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; CHECK-NEXT: .long .LBB0_4
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; CHECK-NEXT: .long .LBB0_5
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; CHECK-NEXT: .long .LBB0_5
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}
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; Check if branch probabilities are correctly assigned to the jump table.
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define void @bar(i32 %x, ptr %to) {
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; CHECK-JT-PROB-LABEL: bar:
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; CHECK-JT-PROB: successors: %bb.6(0x12492492), %bb.8(0x6db6db6e)
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; CHECK-JT-PROB: successors: %bb.1(0x15555555), %bb.2(0x15555555), %bb.3(0x15555555), %bb.4(0x15555555), %bb.5(0x2aaaaaab)
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entry:
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switch i32 %x, label %default [
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i32 0, label %bb0
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i32 1, label %bb1
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i32 2, label %bb2
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i32 3, label %bb3
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i32 4, label %bb4
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i32 5, label %bb4
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], !prof !1
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bb0:
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store i32 0, ptr %to
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br label %exit
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bb1:
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store i32 1, ptr %to
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br label %exit
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bb2:
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store i32 2, ptr %to
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br label %exit
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bb3:
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store i32 3, ptr %to
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br label %exit
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bb4:
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store i32 4, ptr %to
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br label %exit
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default:
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store i32 5, ptr %to
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br label %exit
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exit:
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ret void
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}
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!1 = !{!"branch_weights", i32 16, i32 16, i32 16, i32 16, i32 16, i32 16, i32 16}
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