| Eric Christopher | cee313d | 2019-04-17 04:52:47 +0000 | [diff] [blame] | 1 | ; REQUIRES: asserts |
| Arthur Eubanks | d0acd97 | 2020-08-05 13:49:00 -0700 | [diff] [blame] | 2 | ; RUN: opt < %s -loop-unswitch -enable-new-pm=0 -stats -disable-output 2>&1 | FileCheck %s |
| 3 | ; RUN: opt < %s -loop-unswitch -enable-new-pm=0 -enable-mssa-loop-dependency=true -verify-memoryssa -stats -disable-output 2>&1 | FileCheck %s |
| Eric Christopher | cee313d | 2019-04-17 04:52:47 +0000 | [diff] [blame] | 4 | ; PR 3170 |
| 5 | |
| 6 | define i32 @a(i32 %x, i32 %y) nounwind { |
| 7 | ; CHECK: 1 loop-unswitch - Number of branches unswitched |
| 8 | ; CHECK-NOT: Number of branches unswitched |
| 9 | |
| 10 | entry: |
| 11 | %0 = icmp ult i32 0, %y ; <i1> [#uses=1] |
| 12 | br i1 %0, label %bb.nph, label %bb4 |
| 13 | |
| 14 | bb.nph: ; preds = %entry |
| 15 | %1 = icmp eq i32 %x, 0 ; <i1> [#uses=1] |
| 16 | br label %bb |
| 17 | |
| 18 | bb: ; preds = %bb.nph, %bb3 |
| 19 | %i.01 = phi i32 [ %3, %bb3 ], [ 0, %bb.nph ] ; <i32> [#uses=1] |
| 20 | br i1 %1, label %bb2, label %bb1 |
| 21 | |
| 22 | bb1: ; preds = %bb |
| 23 | %2 = tail call i32 (...) @b() nounwind ; <i32> [#uses=0] |
| 24 | br label %bb2 |
| 25 | |
| 26 | bb2: ; preds = %bb, %bb1 |
| 27 | %3 = add i32 %i.01, 1 ; <i32> [#uses=2] |
| 28 | br label %bb3 |
| 29 | |
| 30 | bb3: ; preds = %bb2 |
| 31 | %i.0 = phi i32 [ %3, %bb2 ] ; <i32> [#uses=1] |
| 32 | %4 = icmp ult i32 %i.0, %y ; <i1> [#uses=1] |
| 33 | br i1 %4, label %bb, label %bb3.bb4_crit_edge |
| 34 | |
| 35 | bb3.bb4_crit_edge: ; preds = %bb3 |
| 36 | br label %bb4 |
| 37 | |
| 38 | bb4: ; preds = %bb3.bb4_crit_edge, %entry |
| 39 | ret i32 0 |
| 40 | } |
| 41 | |
| 42 | declare i32 @b(...) |