| Eric Christopher | cee313d | 2019-04-17 04:52:47 +0000 | [diff] [blame] | 1 | ; RUN: opt < %s -loop-unswitch -loop-unswitch-threshold=0 -S 2>&1 | FileCheck %s |
| 2 | ; RUN: opt < %s -loop-unswitch -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 | |
| 7 | define i32 @test(i1 %cond1, i32 %var1) { |
| 8 | entry: |
| 9 | br label %loop_begin |
| 10 | |
| 11 | loop_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 | |
| 20 | do_something: |
| 21 | %var2 = add i32 %var3, 1 |
| 22 | call void @some_func() noreturn nounwind |
| 23 | br label %loop_begin |
| 24 | |
| 25 | loop_exit: |
| 26 | ret i32 0 |
| 27 | } |
| 28 | |
| 29 | declare void @some_func() noreturn |