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c511b2a5a1
SimplifyCFG tends to form a lot of 2-3 case switches when merging branches. Move the most likely condition to the front so it is checked first and the others can be skipped. This is currently not as effective as it could be because SimplifyCFG destroys profiling metadata when merging branches and switches. Merging branch weight metadata is tricky though. This code touches at most 3 cases so I didn't use a proper sorting algorithm. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157521 91177308-0d34-0410-b5e6-96231b3b80d8
38 lines
690 B
LLVM
38 lines
690 B
LLVM
; RUN: llc -mtriple=x86_64-apple-darwin11 < %s | FileCheck %s
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; Check that the cases which lead to unreachable are checked after "10"
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define void @test1(i32 %x) nounwind uwtable ssp {
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entry:
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switch i32 %x, label %if.end7 [
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i32 0, label %if.then
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i32 10, label %if.then2
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i32 20, label %if.then5
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]
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; CHECK: test1:
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; CHECK-NOT: unr
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; CHECK: cmpl $10
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; CHECK: bar
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; CHECK: cmpl $20
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if.then:
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tail call void @unr(i32 23) noreturn nounwind
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unreachable
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if.then2:
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tail call void @bar(i32 42) nounwind
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br label %if.end7
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if.then5:
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tail call void @unr(i32 5) noreturn nounwind
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unreachable
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if.end7:
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ret void
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}
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declare void @unr(i32) noreturn
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declare void @bar(i32)
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