53 lines
1.4 KiB
LLVM
53 lines
1.4 KiB
LLVM
; RUN: opt < %s -loop-unswitch -loop-unswitch-with-block-frequency -S 2>&1 | FileCheck %s
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;; trivial condition should be unswithed regardless of coldness.
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define i32 @test1(i1 %cond1, i1 %cond2) !prof !1 {
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br i1 %cond1, label %loop_begin, label %loop_exit, !prof !0
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loop_begin:
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; CHECK: br i1 true, label %continue, label %loop_exit.loopexit
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br i1 %cond2, label %continue, label %loop_exit ; trivial condition
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continue:
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call void @some_func1() noreturn nounwind
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br label %loop_begin
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loop_exit:
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ret i32 0
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}
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;; cold non-trivial condition should not be unswitched.
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define i32 @test2(i32* %var, i1 %cond1, i1 %cond2) !prof !1 {
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br i1 %cond1, label %loop_begin, label %loop_exit, !prof !0
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loop_begin:
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store i32 1, i32* %var
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; CHECK: br i1 %cond2, label %continue1, label %continue2
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br i1 %cond2, label %continue1, label %continue2 ; non-trivial condition
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continue1:
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call void @some_func1() noreturn nounwind
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br label %joint
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continue2:
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call void @some_func2() noreturn nounwind
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br label %joint
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joint:
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;; unswitching will duplicate these calls.
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call void @some_func3() noreturn nounwind
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call void @some_func4() noreturn nounwind
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br label %loop_begin
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loop_exit:
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ret i32 0
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}
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declare void @some_func1() noreturn
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declare void @some_func2() noreturn
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declare void @some_func3() noreturn
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declare void @some_func4() noreturn
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!0 = !{!"branch_weights", i32 1, i32 100000000}
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!1 = !{!"function_entry_count", i64 100}
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