| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -passes=gvn -S | FileCheck %s |
| |
| ; This test checks that we don't hang trying to split a critical edge in loadpre |
| ; when the control flow uses a callbr instruction. |
| |
| %struct.pluto = type <{ i8, i8 }> |
| |
| define void @widget(ptr %tmp1) { |
| ; CHECK-LABEL: @widget( |
| ; CHECK-NEXT: bb: |
| ; CHECK-NEXT: callbr void asm sideeffect "", "!i,!i"() |
| ; CHECK-NEXT: to label [[BB4:%.*]] [label [[BB5:%.*]], label %bb.bb8_crit_edge] |
| ; CHECK: bb.bb8_crit_edge: |
| ; CHECK-NEXT: [[TMP10_PRE:%.*]] = load ptr, ptr [[TMP1:%.*]], align 8 |
| ; CHECK-NEXT: br label [[BB8:%.*]] |
| ; CHECK: bb4: |
| ; CHECK-NEXT: br label [[BB5]] |
| ; CHECK: bb5: |
| ; CHECK-NEXT: [[TMP6:%.*]] = load ptr, ptr [[TMP1]], align 8 |
| ; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds [[STRUCT_PLUTO:%.*]], ptr [[TMP6]], i64 0, i32 1 |
| ; CHECK-NEXT: br label [[BB8]] |
| ; CHECK: bb8: |
| ; CHECK-NEXT: [[TMP10:%.*]] = phi ptr [ [[TMP6]], [[BB5]] ], [ [[TMP10_PRE]], [[BB_BB8_CRIT_EDGE:%.*]] ] |
| ; CHECK-NEXT: [[TMP9:%.*]] = phi ptr [ [[TMP7]], [[BB5]] ], [ null, [[BB_BB8_CRIT_EDGE]] ] |
| ; CHECK-NEXT: [[TMP12:%.*]] = load i8, ptr [[TMP10]], align 1 |
| ; CHECK-NEXT: tail call void @spam(ptr [[TMP9]], i8 [[TMP12]]) |
| ; CHECK-NEXT: ret void |
| ; |
| bb: |
| callbr void asm sideeffect "", "!i,!i"() |
| to label %bb4 [label %bb5, label %bb8] |
| |
| bb4: ; preds = %bb |
| br label %bb5 |
| |
| bb5: ; preds = %bb4, %bb |
| %tmp6 = load ptr, ptr %tmp1 |
| %tmp7 = getelementptr inbounds %struct.pluto, ptr %tmp6, i64 0, i32 1 |
| br label %bb8 |
| |
| bb8: ; preds = %bb5, %bb |
| %tmp9 = phi ptr [ %tmp7, %bb5 ], [ null, %bb ] |
| %tmp10 = load ptr, ptr %tmp1 |
| %tmp12 = load i8, ptr %tmp10 |
| tail call void @spam(ptr %tmp9, i8 %tmp12) |
| ret void |
| } |
| |
| declare void @spam(ptr, i8) |
