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llvm-mirror/test/Transforms/LoopRotate/switch.ll
Nikita Popov 9a6b5ddc4c [LoopRotate] Add tests for rotate with switch; NFC 
For D72420.
2020-01-11 11:03:29 +01:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -loop-rotate < %s | FileCheck %s
define i64 @switch_multi_entry_known_entry() {
; CHECK-LABEL: @switch_multi_entry_known_entry(
; CHECK-NEXT: start:
; CHECK-NEXT: br label [[HEADER:%.*]]
; CHECK: header:
; CHECK-NEXT: [[STATE:%.*]] = phi i8 [ 2, [[START:%.*]] ], [ [[NEXT_STATE:%.*]], [[LATCH:%.*]] ]
; CHECK-NEXT: [[COUNT:%.*]] = phi i64 [ 0, [[START]] ], [ [[INC:%.*]], [[LATCH]] ]
; CHECK-NEXT: switch i8 [[STATE]], label [[EXIT:%.*]] [
; CHECK-NEXT: i8 0, label [[LATCH]]
; CHECK-NEXT: i8 2, label [[LATCH]]
; CHECK-NEXT: ]
; CHECK: latch:
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i64 [[COUNT]], 999
; CHECK-NEXT: [[NEXT_STATE]] = zext i1 [[CMP]] to i8
; CHECK-NEXT: [[INC]] = add i64 [[COUNT]], 1
; CHECK-NEXT: br label [[HEADER]]
; CHECK: exit:
; CHECK-NEXT: [[COUNT_LCSSA:%.*]] = phi i64 [ [[COUNT]], [[HEADER]] ]
; CHECK-NEXT: ret i64 [[COUNT_LCSSA]]
;
start:
br label %header
header: ; preds = %latch, %start
%state = phi i8 [ 2, %start ], [ %next_state, %latch ]
%count = phi i64 [ 0, %start ], [ %inc, %latch ]
switch i8 %state, label %exit [
i8 0, label %latch
i8 2, label %latch
]
latch: ; preds = %header, %header
%cmp = icmp eq i64 %count, 999
%next_state = zext i1 %cmp to i8
%inc = add i64 %count, 1
br label %header
exit: ; preds = %header
ret i64 %count
}
define i64 @switch_multi_entry_unknown_entry(i8 %start_state) {
; CHECK-LABEL: @switch_multi_entry_unknown_entry(
; CHECK-NEXT: start:
; CHECK-NEXT: br label [[HEADER:%.*]]
; CHECK: header:
; CHECK-NEXT: [[STATE:%.*]] = phi i8 [ [[START_STATE:%.*]], [[START:%.*]] ], [ [[NEXT_STATE:%.*]], [[LATCH:%.*]] ]
; CHECK-NEXT: [[COUNT:%.*]] = phi i64 [ 0, [[START]] ], [ [[INC:%.*]], [[LATCH]] ]
; CHECK-NEXT: switch i8 [[STATE]], label [[EXIT:%.*]] [
; CHECK-NEXT: i8 0, label [[LATCH]]
; CHECK-NEXT: i8 2, label [[LATCH]]
; CHECK-NEXT: ]
; CHECK: latch:
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i64 [[COUNT]], 999
; CHECK-NEXT: [[NEXT_STATE]] = zext i1 [[CMP]] to i8
; CHECK-NEXT: [[INC]] = add i64 [[COUNT]], 1
; CHECK-NEXT: br label [[HEADER]]
; CHECK: exit:
; CHECK-NEXT: [[COUNT_LCSSA:%.*]] = phi i64 [ [[COUNT]], [[HEADER]] ]
; CHECK-NEXT: ret i64 [[COUNT_LCSSA]]
;
start:
br label %header
header: ; preds = %latch, %start
%state = phi i8 [ %start_state, %start ], [ %next_state, %latch ]
%count = phi i64 [ 0, %start ], [ %inc, %latch ]
switch i8 %state, label %exit [
i8 0, label %latch
i8 2, label %latch
]
latch: ; preds = %header, %header
%cmp = icmp eq i64 %count, 999
%next_state = zext i1 %cmp to i8
%inc = add i64 %count, 1
br label %header
exit: ; preds = %header
ret i64 %count
}
define i64 @switch_multi_exit_known_entry() {
; CHECK-LABEL: @switch_multi_exit_known_entry(
; CHECK-NEXT: start:
; CHECK-NEXT: br label [[HEADER:%.*]]
; CHECK: header:
; CHECK-NEXT: [[STATE:%.*]] = phi i8 [ 0, [[START:%.*]] ], [ [[NEXT_STATE:%.*]], [[LATCH:%.*]] ]
; CHECK-NEXT: [[COUNT:%.*]] = phi i64 [ 0, [[START]] ], [ [[INC:%.*]], [[LATCH]] ]
; CHECK-NEXT: switch i8 [[STATE]], label [[LATCH]] [
; CHECK-NEXT: i8 1, label [[EXIT:%.*]]
; CHECK-NEXT: i8 2, label [[EXIT]]
; CHECK-NEXT: ]
; CHECK: latch:
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i64 [[COUNT]], 999
; CHECK-NEXT: [[NEXT_STATE]] = zext i1 [[CMP]] to i8
; CHECK-NEXT: [[INC]] = add i64 [[COUNT]], 1
; CHECK-NEXT: br label [[HEADER]]
; CHECK: exit:
; CHECK-NEXT: [[COUNT_LCSSA:%.*]] = phi i64 [ [[COUNT]], [[HEADER]] ], [ [[COUNT]], [[HEADER]] ]
; CHECK-NEXT: ret i64 [[COUNT_LCSSA]]
;
start:
br label %header
header: ; preds = %latch, %start
%state = phi i8 [ 0, %start ], [ %next_state, %latch ]
%count = phi i64 [ 0, %start ], [ %inc, %latch ]
switch i8 %state, label %latch [
i8 1, label %exit
i8 2, label %exit
]
latch: ; preds = %header, %header
%cmp = icmp eq i64 %count, 999
%next_state = zext i1 %cmp to i8
%inc = add i64 %count, 1
br label %header
exit: ; preds = %header
ret i64 %count
}
define i64 @switch_multi_exit_unknown_entry(i8 %start_state) {
; CHECK-LABEL: @switch_multi_exit_unknown_entry(
; CHECK-NEXT: start:
; CHECK-NEXT: br label [[HEADER:%.*]]
; CHECK: header:
; CHECK-NEXT: [[STATE:%.*]] = phi i8 [ [[START_STATE:%.*]], [[START:%.*]] ], [ [[NEXT_STATE:%.*]], [[LATCH:%.*]] ]
; CHECK-NEXT: [[COUNT:%.*]] = phi i64 [ 0, [[START]] ], [ [[INC:%.*]], [[LATCH]] ]
; CHECK-NEXT: switch i8 [[STATE]], label [[LATCH]] [
; CHECK-NEXT: i8 1, label [[EXIT:%.*]]
; CHECK-NEXT: i8 2, label [[EXIT]]
; CHECK-NEXT: ]
; CHECK: latch:
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i64 [[COUNT]], 999
; CHECK-NEXT: [[NEXT_STATE]] = zext i1 [[CMP]] to i8
; CHECK-NEXT: [[INC]] = add i64 [[COUNT]], 1
; CHECK-NEXT: br label [[HEADER]]
; CHECK: exit:
; CHECK-NEXT: [[COUNT_LCSSA:%.*]] = phi i64 [ [[COUNT]], [[HEADER]] ], [ [[COUNT]], [[HEADER]] ]
; CHECK-NEXT: ret i64 [[COUNT_LCSSA]]
;
start:
br label %header
header: ; preds = %latch, %start
%state = phi i8 [ %start_state, %start ], [ %next_state, %latch ]
%count = phi i64 [ 0, %start ], [ %inc, %latch ]
switch i8 %state, label %latch [
i8 1, label %exit
i8 2, label %exit
]
latch: ; preds = %header, %header
%cmp = icmp eq i64 %count, 999
%next_state = zext i1 %cmp to i8
%inc = add i64 %count, 1
br label %header
exit: ; preds = %header
ret i64 %count
}
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