derek.holloway
7502bf64a4
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38 lines
1.2 KiB
LLVM
38 lines
1.2 KiB
LLVM
; RUN: opt < %s -passes="loop-mssa(simple-loop-unswitch)" -verify-memoryssa -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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; CHECK-LABEL: define i32 @test(
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entry:
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br label %loop_begin
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[FROZEN:%.+]] = freeze i1 %cond1
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; CHECK-NEXT: br i1 [[FROZEN]], label %entry.split, label %loop_exit.split
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;
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; CHECK: entry.split:
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; CHECK-NEXT: 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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br i1 %cond.and, label %do_something, label %loop_exit
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; CHECK: loop_begin:
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; CHECK-NEXT: %[[VAR3:.*]] = phi i32
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; CHECK-NEXT: %[[COND2:.*]] = icmp eq i32 %[[VAR3]], 10
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; CHECK-NEXT: %[[COND_AND:.*]] = and i1 true, %[[COND2]]
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; CHECK-NEXT: 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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