forked from OSchip/llvm-project
28 lines
811 B
LLVM
28 lines
811 B
LLVM
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; RUN: opt < %s -loop-unswitch -loop-unswitch-threshold=0 -S 2>&1 | FileCheck %s
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; This is to test trivial loop unswitch only happens when trivial condition
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; itself is an LIV loop condition (not partial LIV which could occur in and/or).
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define i32 @test(i1 %cond1, i32 %var1) {
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entry:
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br label %loop_begin
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loop_begin:
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%var3 = phi i32 [%var1, %entry], [%var2, %do_something]
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%cond2 = icmp eq i32 %var3, 10
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%cond.and = and i1 %cond1, %cond2
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; %cond.and only has %cond1 as LIV so no unswitch should happen.
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; CHECK: br i1 %cond.and, label %do_something, label %loop_exit
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br i1 %cond.and, label %do_something, label %loop_exit
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do_something:
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%var2 = add i32 %var3, 1
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call void @some_func() 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_func() noreturn
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