interleaved-loop-order.ll
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -structurizecfg %s -o - | FileCheck %s
; This test have an outer loop containing an inner loop,
; for which there is an interleaved post-order traversal.
;
; This used to produce incorrect code.
; For example %outer.loop.body used to branched to %inner.loop.end
; (instead of %inner.loop.header).
define i1 @test_nested(i32 %x, i1 %b1, i1 %b2, i1 %b3) {
; CHECK-LABEL: @test_nested(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B3_INV:%.*]] = xor i1 [[B3:%.*]], true
; CHECK-NEXT: br label [[OUTER_LOOP_HEADER:%.*]]
; CHECK: Flow12:
; CHECK-NEXT: br i1 [[TMP3:%.*]], label [[EXIT_TRUE:%.*]], label [[FLOW13:%.*]]
; CHECK: exit.true:
; CHECK-NEXT: br label [[FLOW13]]
; CHECK: Flow13:
; CHECK-NEXT: br i1 [[TMP2:%.*]], label [[NEWDEFAULT:%.*]], label [[FLOW14:%.*]]
; CHECK: NewDefault:
; CHECK-NEXT: br label [[EXIT_FALSE:%.*]]
; CHECK: Flow14:
; CHECK-NEXT: [[TMP0:%.*]] = phi i1 [ false, [[EXIT_FALSE]] ], [ true, [[FLOW13]] ]
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: exit.false:
; CHECK-NEXT: br label [[FLOW14]]
; CHECK: outer.loop.header:
; CHECK-NEXT: br i1 [[B1:%.*]], label [[OUTER_LOOP_BODY:%.*]], label [[FLOW3:%.*]]
; CHECK: outer.loop.body:
; CHECK-NEXT: br label [[INNER_LOOP_HEADER:%.*]]
; CHECK: Flow3:
; CHECK-NEXT: [[TMP1:%.*]] = phi i1 [ [[TMP16:%.*]], [[FLOW11:%.*]] ], [ true, [[OUTER_LOOP_HEADER]] ]
; CHECK-NEXT: [[TMP2]] = phi i1 [ [[TMP12:%.*]], [[FLOW11]] ], [ false, [[OUTER_LOOP_HEADER]] ]
; CHECK-NEXT: [[TMP3]] = phi i1 [ false, [[FLOW11]] ], [ true, [[OUTER_LOOP_HEADER]] ]
; CHECK-NEXT: br i1 [[TMP1]], label [[FLOW12:%.*]], label [[OUTER_LOOP_HEADER]]
; CHECK: inner.loop.header:
; CHECK-NEXT: [[TMP4:%.*]] = phi i1 [ [[TMP8:%.*]], [[FLOW4:%.*]] ], [ false, [[OUTER_LOOP_BODY]] ]
; CHECK-NEXT: br i1 [[B2:%.*]], label [[INNER_LOOP_BODY:%.*]], label [[FLOW4]]
; CHECK: Flow6:
; CHECK-NEXT: [[TMP5:%.*]] = phi i1 [ false, [[INNER_LOOP_LATCH:%.*]] ], [ true, [[LEAFBLOCK:%.*]] ]
; CHECK-NEXT: br label [[FLOW5:%.*]]
; CHECK: Flow7:
; CHECK-NEXT: br i1 [[TMP10:%.*]], label [[INNER_LOOP_END:%.*]], label [[FLOW8:%.*]]
; CHECK: inner.loop.end:
; CHECK-NEXT: br label [[FLOW8]]
; CHECK: inner.loop.body:
; CHECK-NEXT: br i1 [[B3_INV]], label [[INNER_LOOP_BODY_ELSE:%.*]], label [[FLOW:%.*]]
; CHECK: inner.loop.body.else:
; CHECK-NEXT: br label [[FLOW]]
; CHECK: Flow:
; CHECK-NEXT: [[TMP6:%.*]] = phi i1 [ false, [[INNER_LOOP_BODY_ELSE]] ], [ true, [[INNER_LOOP_BODY]] ]
; CHECK-NEXT: br i1 [[TMP6]], label [[INNER_LOOP_BODY_THEN:%.*]], label [[INNER_LOOP_COND:%.*]]
; CHECK: inner.loop.body.then:
; CHECK-NEXT: br label [[INNER_LOOP_COND]]
; CHECK: Flow4:
; CHECK-NEXT: [[TMP7:%.*]] = phi i1 [ [[TMP17:%.*]], [[FLOW5]] ], [ true, [[INNER_LOOP_HEADER]] ]
; CHECK-NEXT: [[TMP8]] = phi i1 [ [[TMP18:%.*]], [[FLOW5]] ], [ [[TMP4]], [[INNER_LOOP_HEADER]] ]
; CHECK-NEXT: [[TMP9:%.*]] = phi i1 [ [[TMP19:%.*]], [[FLOW5]] ], [ false, [[INNER_LOOP_HEADER]] ]
; CHECK-NEXT: [[TMP10]] = phi i1 [ false, [[FLOW5]] ], [ true, [[INNER_LOOP_HEADER]] ]
; CHECK-NEXT: br i1 [[TMP7]], label [[FLOW7:%.*]], label [[INNER_LOOP_HEADER]]
; CHECK: inner.loop.cond:
; CHECK-NEXT: br label [[NODEBLOCK:%.*]]
; CHECK: NodeBlock:
; CHECK-NEXT: [[PIVOT:%.*]] = icmp slt i32 [[X:%.*]], 1
; CHECK-NEXT: br i1 [[PIVOT]], label [[LEAFBLOCK]], label [[FLOW5]]
; CHECK: Flow8:
; CHECK-NEXT: [[TMP11:%.*]] = phi i1 [ true, [[INNER_LOOP_END]] ], [ false, [[FLOW7]] ]
; CHECK-NEXT: br i1 [[TMP9]], label [[LEAFBLOCK1:%.*]], label [[FLOW9:%.*]]
; CHECK: LeafBlock1:
; CHECK-NEXT: [[SWITCHLEAF2:%.*]] = icmp eq i32 [[X]], 1
; CHECK-NEXT: br i1 [[SWITCHLEAF2]], label [[INNER_LOOP_BREAK:%.*]], label [[FLOW10:%.*]]
; CHECK: LeafBlock:
; CHECK-NEXT: [[SWITCHLEAF:%.*]] = icmp eq i32 [[X]], 0
; CHECK-NEXT: br i1 [[SWITCHLEAF]], label [[INNER_LOOP_LATCH]], label [[FLOW6:%.*]]
; CHECK: Flow9:
; CHECK-NEXT: [[TMP12]] = phi i1 [ [[TMP14:%.*]], [[FLOW10]] ], [ [[TMP8]], [[FLOW8]] ]
; CHECK-NEXT: [[TMP13:%.*]] = phi i1 [ [[TMP15:%.*]], [[FLOW10]] ], [ [[TMP11]], [[FLOW8]] ]
; CHECK-NEXT: br i1 [[TMP13]], label [[OUTER_LOOP_CLEANUP:%.*]], label [[FLOW11]]
; CHECK: inner.loop.break:
; CHECK-NEXT: br label [[FLOW10]]
; CHECK: Flow10:
; CHECK-NEXT: [[TMP14]] = phi i1 [ false, [[INNER_LOOP_BREAK]] ], [ true, [[LEAFBLOCK1]] ]
; CHECK-NEXT: [[TMP15]] = phi i1 [ true, [[INNER_LOOP_BREAK]] ], [ [[TMP11]], [[LEAFBLOCK1]] ]
; CHECK-NEXT: br label [[FLOW9]]
; CHECK: outer.loop.cleanup:
; CHECK-NEXT: br label [[OUTER_LOOP_LATCH:%.*]]
; CHECK: Flow11:
; CHECK-NEXT: [[TMP16]] = phi i1 [ false, [[OUTER_LOOP_LATCH]] ], [ true, [[FLOW9]] ]
; CHECK-NEXT: br label [[FLOW3]]
; CHECK: outer.loop.latch:
; CHECK-NEXT: br label [[FLOW11]]
; CHECK: Flow5:
; CHECK-NEXT: [[TMP17]] = phi i1 [ [[TMP5]], [[FLOW6]] ], [ true, [[NODEBLOCK]] ]
; CHECK-NEXT: [[TMP18]] = phi i1 [ [[TMP5]], [[FLOW6]] ], [ [[TMP4]], [[NODEBLOCK]] ]
; CHECK-NEXT: [[TMP19]] = phi i1 [ false, [[FLOW6]] ], [ true, [[NODEBLOCK]] ]
; CHECK-NEXT: br label [[FLOW4]]
; CHECK: inner.loop.latch:
; CHECK-NEXT: br label [[FLOW6]]
; CHECK: exit:
; CHECK-NEXT: ret i1 [[TMP0]]
;
entry:
br label %outer.loop.header
exit.true: ; preds = %outer.loop.header
br label %exit
exit.false: ; preds = %inner.loop.cond
br label %exit
outer.loop.header: ; preds = %outer.loop.latch, %entry
br i1 %b1, label %outer.loop.body, label %exit.true
outer.loop.body: ; preds = %outer.loop.header
br label %inner.loop.header
inner.loop.header: ; preds = %inner.loop.latch, %outer.loop.body
br i1 %b2, label %inner.loop.body, label %inner.loop.end
inner.loop.end: ; preds = %inner.loop.header
br label %outer.loop.cleanup
inner.loop.body: ; preds = %inner.loop.header
br i1 %b3, label %inner.loop.body.then, label %inner.loop.body.else
inner.loop.body.else: ; preds = %inner.loop.body
br label %inner.loop.cond
inner.loop.body.then: ; preds = %inner.loop.body
br label %inner.loop.cond
inner.loop.cond: ; preds = %inner.loop.body.then, %inner.loop.body.else
switch i32 %x, label %exit.false [
i32 0, label %inner.loop.latch
i32 1, label %inner.loop.break
]
inner.loop.break: ; preds = %inner.loop.cond
br label %outer.loop.cleanup
outer.loop.cleanup: ; preds = %inner.loop.break, %inner.loop.end
br label %outer.loop.latch
outer.loop.latch: ; preds = %outer.loop.cleanup
br label %outer.loop.header
inner.loop.latch: ; preds = %inner.loop.cond
br label %inner.loop.header
exit: ; preds = %exit.false, %exit.true
%r = phi i1 [ true, %exit.true ], [ false, %exit.false ]
ret i1 %r
}
; This test checks sibling loops that by default have an
; interleaved post-order traversal.
define void @test_siblings(i1 %b1, i1 %b2, i1 %b3, i1 %b4, i1 %b5, i1 %b6, i1 %b7, i1 %b8, i1 %b9) {
; CHECK-LABEL: @test_siblings(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[B9_INV:%.*]] = xor i1 [[B9:%.*]], true
; CHECK-NEXT: [[B6_INV:%.*]] = xor i1 [[B6:%.*]], true
; CHECK-NEXT: [[B2_INV:%.*]] = xor i1 [[B2:%.*]], true
; CHECK-NEXT: [[B8_INV:%.*]] = xor i1 [[B8:%.*]], true
; CHECK-NEXT: [[B5_INV:%.*]] = xor i1 [[B5:%.*]], true
; CHECK-NEXT: [[B3_INV:%.*]] = xor i1 [[B3:%.*]], true
; CHECK-NEXT: [[B4_INV:%.*]] = xor i1 [[B4:%.*]], true
; CHECK-NEXT: [[B1_INV:%.*]] = xor i1 [[B1:%.*]], true
; CHECK-NEXT: br i1 [[B1_INV]], label [[IF_ELSE:%.*]], label [[FLOW:%.*]]
; CHECK: if.else:
; CHECK-NEXT: br label [[FLOW]]
; CHECK: Flow:
; CHECK-NEXT: [[TMP0:%.*]] = phi i1 [ [[TMP0]], [[FLOW1:%.*]] ], [ [[B2]], [[IF_ELSE]] ], [ false, [[ENTRY:%.*]] ]
; CHECK-NEXT: [[TMP1:%.*]] = phi i1 [ [[TMP5:%.*]], [[FLOW1]] ], [ [[B2_INV]], [[IF_ELSE]] ], [ false, [[ENTRY]] ]
; CHECK-NEXT: [[TMP2:%.*]] = phi i1 [ false, [[FLOW1]] ], [ false, [[IF_ELSE]] ], [ true, [[ENTRY]] ]
; CHECK-NEXT: br i1 [[TMP2]], label [[LOOP1_HEADER:%.*]], label [[FLOW1]]
; CHECK: loop1.header:
; CHECK-NEXT: br i1 [[B3_INV]], label [[LOOP1_BODY:%.*]], label [[FLOW2:%.*]]
; CHECK: Flow2:
; CHECK-NEXT: [[TMP3:%.*]] = phi i1 [ true, [[LOOP1_BODY]] ], [ [[TMP1]], [[LOOP1_HEADER]] ]
; CHECK-NEXT: [[TMP4:%.*]] = phi i1 [ [[B5_INV]], [[LOOP1_BODY]] ], [ [[B3]], [[LOOP1_HEADER]] ]
; CHECK-NEXT: br i1 [[TMP4]], label [[LOOP1_LATCH:%.*]], label [[FLOW3:%.*]]
; CHECK: loop1.latch:
; CHECK-NEXT: br label [[FLOW3]]
; CHECK: Flow1:
; CHECK-NEXT: [[TMP5]] = phi i1 [ [[TMP6:%.*]], [[FLOW3]] ], [ [[TMP1]], [[FLOW]] ]
; CHECK-NEXT: br i1 true, label [[FLOW4:%.*]], label [[FLOW]]
; CHECK: loop1.body:
; CHECK-NEXT: br label [[FLOW2]]
; CHECK: Flow3:
; CHECK-NEXT: [[TMP6]] = phi i1 [ false, [[LOOP1_LATCH]] ], [ [[TMP3]], [[FLOW2]] ]
; CHECK-NEXT: br label [[FLOW1]]
; CHECK: Flow4:
; CHECK-NEXT: [[TMP7:%.*]] = phi i1 [ false, [[FLOW5:%.*]] ], [ [[TMP5]], [[FLOW1]] ]
; CHECK-NEXT: br i1 [[TMP7]], label [[LOOP2_HEADER:%.*]], label [[FLOW5]]
; CHECK: loop2.header:
; CHECK-NEXT: br i1 [[B6_INV]], label [[LOOP2_BODY:%.*]], label [[FLOW6:%.*]]
; CHECK: Flow5:
; CHECK-NEXT: [[TMP8:%.*]] = phi i1 [ [[TMP11:%.*]], [[FLOW7:%.*]] ], [ false, [[FLOW4]] ]
; CHECK-NEXT: br i1 true, label [[FLOW8:%.*]], label [[FLOW4]]
; CHECK: loop2.body:
; CHECK-NEXT: br label [[FLOW6]]
; CHECK: Flow6:
; CHECK-NEXT: [[TMP9:%.*]] = phi i1 [ true, [[LOOP2_BODY]] ], [ false, [[LOOP2_HEADER]] ]
; CHECK-NEXT: [[TMP10:%.*]] = phi i1 [ [[B7:%.*]], [[LOOP2_BODY]] ], [ [[B6]], [[LOOP2_HEADER]] ]
; CHECK-NEXT: br i1 [[TMP10]], label [[LOOP2_LATCH:%.*]], label [[FLOW7]]
; CHECK: loop2.latch:
; CHECK-NEXT: br label [[FLOW7]]
; CHECK: Flow7:
; CHECK-NEXT: [[TMP11]] = phi i1 [ false, [[LOOP2_LATCH]] ], [ [[TMP9]], [[FLOW6]] ]
; CHECK-NEXT: br label [[FLOW5]]
; CHECK: Flow8:
; CHECK-NEXT: [[TMP12:%.*]] = phi i1 [ false, [[FLOW10:%.*]] ], [ [[TMP0]], [[FLOW5]] ]
; CHECK-NEXT: [[TMP13:%.*]] = phi i1 [ false, [[FLOW10]] ], [ [[TMP8]], [[FLOW5]] ]
; CHECK-NEXT: br i1 [[TMP13]], label [[LOOP3_HEADER:%.*]], label [[FLOW9:%.*]]
; CHECK: loop3.header:
; CHECK-NEXT: br label [[FLOW9]]
; CHECK: Flow9:
; CHECK-NEXT: [[TMP14:%.*]] = phi i1 [ true, [[LOOP3_HEADER]] ], [ [[TMP12]], [[FLOW8]] ]
; CHECK-NEXT: br i1 [[TMP14]], label [[LOOP3_LATCH:%.*]], label [[FLOW10]]
; CHECK: loop3.latch:
; CHECK-NEXT: br label [[FLOW10]]
; CHECK: Flow10:
; CHECK-NEXT: br i1 true, label [[EXIT:%.*]], label [[FLOW8]]
; CHECK: exit:
; CHECK-NEXT: ret void
;
entry:
br i1 %b1, label %loop1.header, label %if.else
if.else:
br i1 %b2, label %loop3.latch, label %loop2.header
loop1.header:
br i1 %b3, label %loop1.latch, label %loop1.body
loop1.latch:
br i1 %b4, label %loop1.header, label %exit
loop1.body:
br i1 %b5, label %loop2.header, label %loop1.latch
loop2.header:
br i1 %b6, label %loop2.latch, label %loop2.body
loop2.body:
br i1 %b7, label %loop2.latch, label %loop3.header
loop2.latch:
br i1 %b8, label %loop2.header, label %exit
loop3.header:
br label %loop3.latch
loop3.latch:
br i1 %b9, label %loop3.header, label %exit
exit:
ret void
}