1; RUN: opt < %s -loop-unswitch -enable-new-pm=0 -loop-unswitch-threshold=0 -S 2>&1 | FileCheck %s 2; RUN: opt < %s -loop-unswitch -enable-new-pm=0 -loop-unswitch-threshold=0 -enable-mssa-loop-dependency=true -verify-memoryssa -S 2>&1 | FileCheck %s 3 4; This is to test trivial loop unswitch only happens when trivial condition 5; itself is an LIV loop condition (not partial LIV which could occur in and/or). 6 7define i32 @test(i1 %cond1, i32 %var1) { 8entry: 9 br label %loop_begin 10 11loop_begin: 12 %var3 = phi i32 [%var1, %entry], [%var2, %do_something] 13 %cond2 = icmp eq i32 %var3, 10 14 %cond.and = and i1 %cond1, %cond2 15 16; %cond.and only has %cond1 as LIV so no unswitch should happen. 17; CHECK: br i1 %cond.and, label %do_something, label %loop_exit 18 br i1 %cond.and, label %do_something, label %loop_exit 19 20do_something: 21 %var2 = add i32 %var3, 1 22 call void @some_func() noreturn nounwind 23 br label %loop_begin 24 25loop_exit: 26 ret i32 0 27} 28 29declare void @some_func() noreturn 30