; 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 }