| Chen Li | c0f3a15 | 2015-07-22 05:26:29 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -loop-unswitch -loop-unswitch-threshold=0 -S 2>&1 | FileCheck %s |
| 2 | |
| 3 | ; This is to test trivial loop unswitch only happens when trivial condition |
| 4 | ; itself is an LIV loop condition (not partial LIV which could occur in and/or). |
| 5 | |
| 6 | define i32 @test(i1 %cond1, i32 %var1) { |
| 7 | entry: |
| 8 | br label %loop_begin |
| 9 | |
| 10 | loop_begin: |
| 11 | %var3 = phi i32 [%var1, %entry], [%var2, %do_something] |
| 12 | %cond2 = icmp eq i32 %var3, 10 |
| 13 | %cond.and = and i1 %cond1, %cond2 |
| 14 | |
| 15 | ; %cond.and only has %cond1 as LIV so no unswitch should happen. |
| 16 | ; CHECK: br i1 %cond.and, label %do_something, label %loop_exit |
| 17 | br i1 %cond.and, label %do_something, label %loop_exit |
| 18 | |
| 19 | do_something: |
| 20 | %var2 = add i32 %var3, 1 |
| 21 | call void @some_func() noreturn nounwind |
| 22 | br label %loop_begin |
| 23 | |
| 24 | loop_exit: |
| 25 | ret i32 0 |
| 26 | } |
| 27 | |
| 28 | declare void @some_func() noreturn |