| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5 |
| ; RUN: opt < %s -max-phi-entries-increase-after-removing-empty-block=12 -passes=simplifycfg -S | FileCheck --check-prefixes=CHECK-12 %s |
| ; RUN: opt < %s -max-phi-entries-increase-after-removing-empty-block=11 -passes=simplifycfg -S | FileCheck --check-prefixes=CHECK-11 %s |
| ; RUN: opt < %s -max-phi-entries-increase-after-removing-empty-block=4 -passes=simplifycfg -S | FileCheck --check-prefixes=CHECK-4 %s |
| ; |
| ; This test has the following CFG: |
| ; 1. entry has a switch to 4 blocks: B1 - B4 |
| ; 2. For B1 and B2, it branches to B5 and B6 |
| ; 3. For B3 and B4, it branches to B5 and B7 |
| ; 4. In B5, %val is defined as phi taking values from B1 to B4 |
| ; 5. B5, B6, B7 branch to block Merge unconditionally |
| ; 6. Block Merge has 5 phis(%x1 - %x4 and %val_merge). |
| ; |
| ; If we remove B5, %x1 - %x4 will increase the number of phi entries by (4 - 1) * 4 = 12. For %val_merge, since the value taking from B5 |
| ; is defined in B5, it will not increase the number of phi entries (it can be considered as move the entries from %val to |
| ; %val_merge). Therefore, removing B5 will increase the number of phi entries by 12 (not (4 - 1) * 5 = 15). |
| ; |
| ; If we remove B6 / B7, it will increase the number of phi entries by (2 - 1) * 5 = 5. |
| ; |
| ; In the first test, max-phi-entries-increase-after-removing-empty-block is set to be 12, then B5 will be removed. |
| ; In the second test, max-phi-entries-increase-after-removing-empty-block is set to be 11, then B5 should not be removed, |
| ; but B6 and B7 can be removed. |
| ; In the third test, max-phi-entries-increase-after-removing-empty-block is set to be 4, then no BB can be removed. |
| ; |
| define void @foo(i32 %a, i32 %val1, i32 %val2, i32 %val3, i32 %val4) { |
| ; CHECK-12-LABEL: define void @foo( |
| ; CHECK-12-SAME: i32 [[A:%.*]], i32 [[VAL1:%.*]], i32 [[VAL2:%.*]], i32 [[VAL3:%.*]], i32 [[VAL4:%.*]]) { |
| ; CHECK-12-NEXT: [[ENTRY:.*:]] |
| ; CHECK-12-NEXT: switch i32 [[A]], label %[[B1:.*]] [ |
| ; CHECK-12-NEXT: i32 4, label %[[B4:.*]] |
| ; CHECK-12-NEXT: i32 2, label %[[B2:.*]] |
| ; CHECK-12-NEXT: i32 3, label %[[B3:.*]] |
| ; CHECK-12-NEXT: ] |
| ; CHECK-12: [[B1]]: |
| ; CHECK-12-NEXT: [[CMP1:%.*]] = icmp eq i32 [[VAL1]], 1 |
| ; CHECK-12-NEXT: br i1 [[CMP1]], label %[[B6:.*]], label %[[MERGE:.*]] |
| ; CHECK-12: [[B2]]: |
| ; CHECK-12-NEXT: [[CMP2:%.*]] = icmp eq i32 [[VAL2]], 2 |
| ; CHECK-12-NEXT: br i1 [[CMP2]], label %[[B6]], label %[[MERGE]] |
| ; CHECK-12: [[B3]]: |
| ; CHECK-12-NEXT: [[CMP3:%.*]] = icmp eq i32 [[VAL3]], 3 |
| ; CHECK-12-NEXT: br i1 [[CMP3]], label %[[B7:.*]], label %[[MERGE]] |
| ; CHECK-12: [[B4]]: |
| ; CHECK-12-NEXT: [[CMP4:%.*]] = icmp eq i32 [[VAL4]], 4 |
| ; CHECK-12-NEXT: br i1 [[CMP4]], label %[[B7]], label %[[MERGE]] |
| ; CHECK-12: [[B6]]: |
| ; CHECK-12-NEXT: br label %[[MERGE]] |
| ; CHECK-12: [[B7]]: |
| ; CHECK-12-NEXT: br label %[[MERGE]] |
| ; CHECK-12: [[MERGE]]: |
| ; CHECK-12-NEXT: [[X1:%.*]] = phi i16 [ 0, %[[B6]] ], [ 2, %[[B7]] ], [ 1, %[[B4]] ], [ 1, %[[B3]] ], [ 1, %[[B2]] ], [ 1, %[[B1]] ] |
| ; CHECK-12-NEXT: [[X2:%.*]] = phi i16 [ 0, %[[B6]] ], [ 2, %[[B7]] ], [ 2, %[[B4]] ], [ 2, %[[B3]] ], [ 2, %[[B2]] ], [ 2, %[[B1]] ] |
| ; CHECK-12-NEXT: [[X3:%.*]] = phi i16 [ 0, %[[B6]] ], [ 2, %[[B7]] ], [ 3, %[[B4]] ], [ 3, %[[B3]] ], [ 3, %[[B2]] ], [ 3, %[[B1]] ] |
| ; CHECK-12-NEXT: [[X4:%.*]] = phi i16 [ 0, %[[B6]] ], [ 2, %[[B7]] ], [ 4, %[[B4]] ], [ 4, %[[B3]] ], [ 4, %[[B2]] ], [ 4, %[[B1]] ] |
| ; CHECK-12-NEXT: [[VAL_MERGE:%.*]] = phi i32 [ 0, %[[B6]] ], [ 2, %[[B7]] ], [ [[VAL1]], %[[B1]] ], [ [[VAL2]], %[[B2]] ], [ [[VAL3]], %[[B3]] ], [ [[VAL4]], %[[B4]] ] |
| ; CHECK-12-NEXT: ret void |
| ; |
| ; CHECK-11-LABEL: define void @foo( |
| ; CHECK-11-SAME: i32 [[A:%.*]], i32 [[VAL1:%.*]], i32 [[VAL2:%.*]], i32 [[VAL3:%.*]], i32 [[VAL4:%.*]]) { |
| ; CHECK-11-NEXT: [[ENTRY:.*:]] |
| ; CHECK-11-NEXT: switch i32 [[A]], label %[[B1:.*]] [ |
| ; CHECK-11-NEXT: i32 4, label %[[B4:.*]] |
| ; CHECK-11-NEXT: i32 2, label %[[B2:.*]] |
| ; CHECK-11-NEXT: i32 3, label %[[B3:.*]] |
| ; CHECK-11-NEXT: ] |
| ; CHECK-11: [[B1]]: |
| ; CHECK-11-NEXT: [[CMP1:%.*]] = icmp eq i32 [[VAL1]], 1 |
| ; CHECK-11-NEXT: br i1 [[CMP1]], label %[[MERGE:.*]], label %[[B5:.*]] |
| ; CHECK-11: [[B2]]: |
| ; CHECK-11-NEXT: [[CMP2:%.*]] = icmp eq i32 [[VAL2]], 2 |
| ; CHECK-11-NEXT: br i1 [[CMP2]], label %[[MERGE]], label %[[B5]] |
| ; CHECK-11: [[B3]]: |
| ; CHECK-11-NEXT: [[CMP3:%.*]] = icmp eq i32 [[VAL3]], 3 |
| ; CHECK-11-NEXT: br i1 [[CMP3]], label %[[MERGE]], label %[[B5]] |
| ; CHECK-11: [[B4]]: |
| ; CHECK-11-NEXT: [[CMP4:%.*]] = icmp eq i32 [[VAL4]], 4 |
| ; CHECK-11-NEXT: br i1 [[CMP4]], label %[[MERGE]], label %[[B5]] |
| ; CHECK-11: [[B5]]: |
| ; CHECK-11-NEXT: [[VAL:%.*]] = phi i32 [ [[VAL1]], %[[B1]] ], [ [[VAL2]], %[[B2]] ], [ [[VAL3]], %[[B3]] ], [ [[VAL4]], %[[B4]] ] |
| ; CHECK-11-NEXT: br label %[[MERGE]] |
| ; CHECK-11: [[MERGE]]: |
| ; CHECK-11-NEXT: [[X1:%.*]] = phi i16 [ 1, %[[B5]] ], [ 0, %[[B2]] ], [ 0, %[[B1]] ], [ 2, %[[B4]] ], [ 2, %[[B3]] ] |
| ; CHECK-11-NEXT: [[X2:%.*]] = phi i16 [ 2, %[[B5]] ], [ 0, %[[B2]] ], [ 0, %[[B1]] ], [ 2, %[[B4]] ], [ 2, %[[B3]] ] |
| ; CHECK-11-NEXT: [[X3:%.*]] = phi i16 [ 3, %[[B5]] ], [ 0, %[[B2]] ], [ 0, %[[B1]] ], [ 2, %[[B4]] ], [ 2, %[[B3]] ] |
| ; CHECK-11-NEXT: [[X4:%.*]] = phi i16 [ 4, %[[B5]] ], [ 0, %[[B2]] ], [ 0, %[[B1]] ], [ 2, %[[B4]] ], [ 2, %[[B3]] ] |
| ; CHECK-11-NEXT: [[VAL_MERGE:%.*]] = phi i32 [ [[VAL]], %[[B5]] ], [ 0, %[[B2]] ], [ 0, %[[B1]] ], [ 2, %[[B4]] ], [ 2, %[[B3]] ] |
| ; CHECK-11-NEXT: ret void |
| ; |
| ; CHECK-4-LABEL: define void @foo( |
| ; CHECK-4-SAME: i32 [[A:%.*]], i32 [[VAL1:%.*]], i32 [[VAL2:%.*]], i32 [[VAL3:%.*]], i32 [[VAL4:%.*]]) { |
| ; CHECK-4-NEXT: [[ENTRY:.*:]] |
| ; CHECK-4-NEXT: switch i32 [[A]], label %[[B1:.*]] [ |
| ; CHECK-4-NEXT: i32 4, label %[[B4:.*]] |
| ; CHECK-4-NEXT: i32 2, label %[[B2:.*]] |
| ; CHECK-4-NEXT: i32 3, label %[[B3:.*]] |
| ; CHECK-4-NEXT: ] |
| ; CHECK-4: [[B1]]: |
| ; CHECK-4-NEXT: [[CMP1:%.*]] = icmp eq i32 [[VAL1]], 1 |
| ; CHECK-4-NEXT: br i1 [[CMP1]], label %[[B6:.*]], label %[[B5:.*]] |
| ; CHECK-4: [[B2]]: |
| ; CHECK-4-NEXT: [[CMP2:%.*]] = icmp eq i32 [[VAL2]], 2 |
| ; CHECK-4-NEXT: br i1 [[CMP2]], label %[[B6]], label %[[B5]] |
| ; CHECK-4: [[B3]]: |
| ; CHECK-4-NEXT: [[CMP3:%.*]] = icmp eq i32 [[VAL3]], 3 |
| ; CHECK-4-NEXT: br i1 [[CMP3]], label %[[B7:.*]], label %[[B5]] |
| ; CHECK-4: [[B4]]: |
| ; CHECK-4-NEXT: [[CMP4:%.*]] = icmp eq i32 [[VAL4]], 4 |
| ; CHECK-4-NEXT: br i1 [[CMP4]], label %[[B7]], label %[[B5]] |
| ; CHECK-4: [[B5]]: |
| ; CHECK-4-NEXT: [[VAL:%.*]] = phi i32 [ [[VAL1]], %[[B1]] ], [ [[VAL2]], %[[B2]] ], [ [[VAL3]], %[[B3]] ], [ [[VAL4]], %[[B4]] ] |
| ; CHECK-4-NEXT: br label %[[MERGE:.*]] |
| ; CHECK-4: [[B6]]: |
| ; CHECK-4-NEXT: br label %[[MERGE]] |
| ; CHECK-4: [[B7]]: |
| ; CHECK-4-NEXT: br label %[[MERGE]] |
| ; CHECK-4: [[MERGE]]: |
| ; CHECK-4-NEXT: [[X1:%.*]] = phi i16 [ 1, %[[B5]] ], [ 0, %[[B6]] ], [ 2, %[[B7]] ] |
| ; CHECK-4-NEXT: [[X2:%.*]] = phi i16 [ 2, %[[B5]] ], [ 0, %[[B6]] ], [ 2, %[[B7]] ] |
| ; CHECK-4-NEXT: [[X3:%.*]] = phi i16 [ 3, %[[B5]] ], [ 0, %[[B6]] ], [ 2, %[[B7]] ] |
| ; CHECK-4-NEXT: [[X4:%.*]] = phi i16 [ 4, %[[B5]] ], [ 0, %[[B6]] ], [ 2, %[[B7]] ] |
| ; CHECK-4-NEXT: [[VAL_MERGE:%.*]] = phi i32 [ [[VAL]], %[[B5]] ], [ 0, %[[B6]] ], [ 2, %[[B7]] ] |
| ; CHECK-4-NEXT: ret void |
| ; |
| entry: |
| switch i32 %a, label %B1 [ |
| i32 4, label %B4 |
| i32 2, label %B2 |
| i32 3, label %B3 |
| ] |
| |
| B1: ; preds = %entry |
| %cmp1 = icmp eq i32 %val1, 1 |
| br i1 %cmp1, label %B6, label %B5 |
| |
| B2: ; preds = %entry |
| %cmp2 = icmp eq i32 %val2, 2 |
| br i1 %cmp2, label %B6, label %B5 |
| |
| B3: ; preds = %entry |
| %cmp3 = icmp eq i32 %val3, 3 |
| br i1 %cmp3, label %B7, label %B5 |
| |
| B4: ; preds = %entry |
| %cmp4 = icmp eq i32 %val4, 4 |
| br i1 %cmp4, label %B7, label %B5 |
| |
| B5: ; preds = %B4, %B3, %B2, %B1 |
| %val = phi i32 [ %val1, %B1 ], [ %val2, %B2 ], [ %val3, %B3 ], [ %val4, %B4 ] |
| br label %Merge |
| |
| B6: ; preds = %B2, %B1 |
| br label %Merge |
| |
| B7: ; preds = %B4, %B3 |
| br label %Merge |
| |
| Merge: ; preds = %B7, %B6, %B5 |
| %x1 = phi i16 [ 1, %B5 ], [ 0, %B6 ], [ 2, %B7 ] |
| %x2 = phi i16 [ 2, %B5 ], [ 0, %B6 ], [ 2, %B7 ] |
| %x3 = phi i16 [ 3, %B5 ], [ 0, %B6 ], [ 2, %B7 ] |
| %x4 = phi i16 [ 4, %B5 ], [ 0, %B6 ], [ 2, %B7 ] |
| %val_merge = phi i32 [ %val, %B5 ], [ 0, %B6 ], [ 2, %B7 ] |
| ret void |
| } |
