; RUN: opt < %s -S -loop-unroll -verify-loop-info | FileCheck %s
|
;
|
; Unit tests for LoopInfo::markAsRemoved.
|
|
declare i1 @check() nounwind
|
|
; Ensure that tail->inner is removed and rely on verify-loopinfo to
|
; check soundness.
|
;
|
; CHECK-LABEL: @skiplevelexit(
|
; CHECK: tail:
|
; CHECK-NOT: br
|
; CHECK: ret void
|
define void @skiplevelexit() nounwind {
|
entry:
|
br label %outer
|
|
outer:
|
br label %inner
|
|
inner:
|
%iv = phi i32 [ 0, %outer ], [ %inc, %tail ]
|
%inc = add i32 %iv, 1
|
call zeroext i1 @check()
|
br i1 true, label %outer.backedge, label %tail
|
|
tail:
|
br i1 false, label %inner, label %exit
|
|
outer.backedge:
|
br label %outer
|
|
exit:
|
ret void
|
}
|
|
; Remove the middle loop of a triply nested loop tree.
|
; Ensure that only the middle loop is removed and rely on verify-loopinfo to
|
; check soundness.
|
;
|
; CHECK-LABEL: @unloopNested(
|
; Outer loop control.
|
; CHECK: while.body:
|
; CHECK: br i1 %cmp3, label %if.then, label %if.end
|
; Inner loop control.
|
; CHECK: while.end14.i:
|
; CHECK: br i1 %call15.i, label %if.end.i, label %exit
|
; Middle loop control should no longer reach %while.cond.
|
; Now it is the outer loop backedge.
|
; CHECK: exit:
|
; CHECK: br label %while.cond.outer
|
define void @unloopNested() {
|
entry:
|
br label %while.cond.outer
|
|
while.cond.outer:
|
br label %while.cond
|
|
while.cond:
|
%cmp = call zeroext i1 @check()
|
br i1 %cmp, label %while.body, label %while.end
|
|
while.body:
|
%cmp3 = call zeroext i1 @check()
|
br i1 %cmp3, label %if.then, label %if.end
|
|
if.then:
|
br label %return
|
|
if.end:
|
%cmp.i48 = call zeroext i1 @check()
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br i1 %cmp.i48, label %if.then.i, label %if.else20.i
|
|
if.then.i:
|
%cmp8.i = call zeroext i1 @check()
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br i1 %cmp8.i, label %merge, label %if.else.i
|
|
if.else.i:
|
br label %merge
|
|
if.else20.i:
|
%cmp25.i = call zeroext i1 @check()
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br i1 %cmp25.i, label %merge, label %if.else28.i
|
|
if.else28.i:
|
br label %merge
|
|
merge:
|
br label %while.cond2.i
|
|
while.cond2.i:
|
%cmp.i = call zeroext i1 @check()
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br i1 %cmp.i, label %while.cond2.backedge.i, label %while.end.i
|
|
while.cond2.backedge.i:
|
br label %while.cond2.i
|
|
while.end.i:
|
%cmp1114.i = call zeroext i1 @check()
|
br i1 %cmp1114.i, label %while.body12.lr.ph.i, label %while.end14.i
|
|
while.body12.lr.ph.i:
|
br label %while.end14.i
|
|
while.end14.i:
|
%call15.i = call zeroext i1 @check()
|
br i1 %call15.i, label %if.end.i, label %exit
|
|
if.end.i:
|
br label %while.cond2.backedge.i
|
|
exit:
|
br i1 false, label %while.cond, label %if.else
|
|
if.else:
|
br label %while.cond.outer
|
|
while.end:
|
br label %return
|
|
return:
|
ret void
|
}
|
|
; Remove the middle loop of a deeply nested loop tree.
|
; Ensure that only the middle loop is removed and rely on verify-loopinfo to
|
; check soundness.
|
;
|
; This test must be disabled until trip count computation can be optimized...
|
; rdar:14038809 [SCEV]: Optimize trip count computation for multi-exit loops.
|
; CHECKFIXME-LABEL: @unloopDeepNested(
|
; Inner-inner loop control.
|
; CHECKFIXME: while.cond.us.i:
|
; CHECKFIXME: br i1 %cmp.us.i, label %next_data.exit, label %while.body.us.i
|
; CHECKFIXME: if.then.us.i:
|
; CHECKFIXME: br label %while.cond.us.i
|
; Inner loop tail.
|
; CHECKFIXME: if.else.i:
|
; CHECKFIXME: br label %while.cond.outer.i
|
; Middle loop control (removed).
|
; CHECKFIXME: valid_data.exit:
|
; CHECKFIXME-NOT: br
|
; CHECKFIXME: %cmp = call zeroext i1 @check()
|
; Outer loop control.
|
; CHECKFIXME: copy_data.exit:
|
; CHECKFIXME: br i1 %cmp38, label %if.then39, label %while.cond.outer
|
; Outer-outer loop tail.
|
; CHECKFIXME: while.cond.outer.outer.backedge:
|
; CHECKFIXME: br label %while.cond.outer.outer
|
define void @unloopDeepNested() nounwind {
|
for.cond8.preheader.i:
|
%cmp113.i = call zeroext i1 @check()
|
br i1 %cmp113.i, label %make_data.exit, label %for.body13.lr.ph.i
|
|
for.body13.lr.ph.i:
|
br label %make_data.exit
|
|
make_data.exit:
|
br label %while.cond.outer.outer
|
|
while.cond.outer.outer:
|
br label %while.cond.outer
|
|
while.cond.outer:
|
br label %while.cond
|
|
while.cond:
|
br label %while.cond.outer.i
|
|
while.cond.outer.i:
|
%tmp192.ph.i = call zeroext i1 @check()
|
br i1 %tmp192.ph.i, label %while.cond.outer.split.us.i, label %while.body.loopexit
|
|
while.cond.outer.split.us.i:
|
br label %while.cond.us.i
|
|
while.cond.us.i:
|
%cmp.us.i = call zeroext i1 @check()
|
br i1 %cmp.us.i, label %next_data.exit, label %while.body.us.i
|
|
while.body.us.i:
|
%cmp7.us.i = call zeroext i1 @check()
|
br i1 %cmp7.us.i, label %if.then.us.i, label %if.else.i
|
|
if.then.us.i:
|
br label %while.cond.us.i
|
|
if.else.i:
|
br label %while.cond.outer.i
|
|
next_data.exit:
|
%tmp192.ph.i.lcssa28 = call zeroext i1 @check()
|
br i1 %tmp192.ph.i.lcssa28, label %while.end, label %while.body
|
|
while.body.loopexit:
|
br label %while.body
|
|
while.body:
|
br label %while.cond.i
|
|
while.cond.i:
|
%cmp.i = call zeroext i1 @check()
|
br i1 %cmp.i, label %valid_data.exit, label %while.body.i
|
|
while.body.i:
|
%cmp7.i = call zeroext i1 @check()
|
br i1 %cmp7.i, label %valid_data.exit, label %if.end.i
|
|
if.end.i:
|
br label %while.cond.i
|
|
valid_data.exit:
|
br i1 true, label %if.then, label %while.cond
|
|
if.then:
|
%cmp = call zeroext i1 @check()
|
br i1 %cmp, label %if.then12, label %if.end
|
|
if.then12:
|
br label %if.end
|
|
if.end:
|
%tobool3.i = call zeroext i1 @check()
|
br i1 %tobool3.i, label %copy_data.exit, label %while.body.lr.ph.i
|
|
while.body.lr.ph.i:
|
br label %copy_data.exit
|
|
copy_data.exit:
|
%cmp38 = call zeroext i1 @check()
|
br i1 %cmp38, label %if.then39, label %while.cond.outer
|
|
if.then39:
|
%cmp5.i = call zeroext i1 @check()
|
br i1 %cmp5.i, label %while.cond.outer.outer.backedge, label %for.cond8.preheader.i8.thread
|
|
for.cond8.preheader.i8.thread:
|
br label %while.cond.outer.outer.backedge
|
|
while.cond.outer.outer.backedge:
|
br label %while.cond.outer.outer
|
|
while.end:
|
ret void
|
}
|
|
; Remove a nested loop with irreducible control flow.
|
; Ensure that only the middle loop is removed and rely on verify-loopinfo to
|
; check soundness.
|
;
|
; CHECK-LABEL: @unloopIrreducible(
|
; Irreducible loop.
|
; CHECK: for.inc117:
|
; CHECK: br label %for.cond103t
|
; Nested loop (removed).
|
; CHECK: for.inc159:
|
; CHECK: br label %for.inc163
|
define void @unloopIrreducible() nounwind {
|
|
entry:
|
br label %for.body
|
|
for.body:
|
%cmp2113 = call zeroext i1 @check()
|
br i1 %cmp2113, label %for.body22.lr.ph, label %for.inc163
|
|
for.body22.lr.ph:
|
br label %for.body22
|
|
for.body22:
|
br label %for.body33
|
|
for.body33:
|
br label %for.end
|
|
for.end:
|
%cmp424 = call zeroext i1 @check()
|
br i1 %cmp424, label %for.body43.lr.ph, label %for.end93
|
|
for.body43.lr.ph:
|
br label %for.end93
|
|
for.end93:
|
%cmp96 = call zeroext i1 @check()
|
br i1 %cmp96, label %if.then97, label %for.cond103
|
|
if.then97:
|
br label %for.cond103t
|
|
for.cond103t:
|
br label %for.cond103
|
|
for.cond103:
|
%cmp105 = call zeroext i1 @check()
|
br i1 %cmp105, label %for.body106, label %for.end120
|
|
for.body106:
|
%cmp108 = call zeroext i1 @check()
|
br i1 %cmp108, label %if.then109, label %for.inc117
|
|
if.then109:
|
br label %for.inc117
|
|
for.inc117:
|
br label %for.cond103t
|
|
for.end120:
|
br label %for.inc159
|
|
for.inc159:
|
br i1 false, label %for.body22, label %for.cond15.for.inc163_crit_edge
|
|
for.cond15.for.inc163_crit_edge:
|
br label %for.inc163
|
|
for.inc163:
|
%cmp12 = call zeroext i1 @check()
|
br i1 %cmp12, label %for.body, label %for.end166
|
|
for.end166:
|
ret void
|
|
}
|
|
; Remove a loop whose exit branches into a sibling loop.
|
; Ensure that only the loop is removed and rely on verify-loopinfo to
|
; check soundness.
|
;
|
; CHECK-LABEL: @unloopCriticalEdge(
|
; CHECK: while.cond.outer.i.loopexit.split:
|
; CHECK: br label %while.body
|
; CHECK: while.body:
|
; CHECK: br label %for.end78
|
define void @unloopCriticalEdge() nounwind {
|
entry:
|
br label %for.cond31
|
|
for.cond31:
|
br i1 undef, label %for.body35, label %for.end94
|
|
for.body35:
|
br label %while.cond.i.preheader
|
|
while.cond.i.preheader:
|
br i1 undef, label %while.cond.i.preheader.split, label %while.cond.outer.i.loopexit.split
|
|
while.cond.i.preheader.split:
|
br label %while.cond.i
|
|
while.cond.i:
|
br i1 true, label %while.cond.i, label %while.cond.outer.i.loopexit
|
|
while.cond.outer.i.loopexit:
|
br label %while.cond.outer.i.loopexit.split
|
|
while.cond.outer.i.loopexit.split:
|
br i1 false, label %while.cond.i.preheader, label %Func2.exit
|
|
Func2.exit:
|
br label %while.body
|
|
while.body:
|
br i1 false, label %while.body, label %while.end
|
|
while.end:
|
br label %for.end78
|
|
for.end78:
|
br i1 undef, label %Proc2.exit, label %for.cond.i.preheader
|
|
for.cond.i.preheader:
|
br label %for.cond.i
|
|
for.cond.i:
|
br label %for.cond.i
|
|
Proc2.exit:
|
br label %for.cond31
|
|
for.end94:
|
ret void
|
}
|
|
; Test UnloopUpdater::removeBlocksFromAncestors.
|
;
|
; Check that the loop backedge is removed from the middle loop 1699,
|
; but not the inner loop 1676.
|
; CHECK: while.body1694:
|
; CHECK: br label %while.cond1676
|
; CHECK: while.end1699:
|
; CHECK: br label %sw.default1711
|
define void @removeSubloopBlocks() nounwind {
|
entry:
|
br label %tryagain.outer
|
|
tryagain.outer: ; preds = %sw.bb304, %entry
|
br label %tryagain
|
|
tryagain: ; preds = %while.end1699, %tryagain.outer
|
br i1 undef, label %sw.bb1669, label %sw.bb304
|
|
sw.bb304: ; preds = %tryagain
|
br i1 undef, label %return, label %tryagain.outer
|
|
sw.bb1669: ; preds = %tryagain
|
br i1 undef, label %sw.default1711, label %while.cond1676
|
|
while.cond1676: ; preds = %while.body1694, %sw.bb1669
|
br i1 undef, label %while.end1699, label %while.body1694
|
|
while.body1694: ; preds = %while.cond1676
|
br label %while.cond1676
|
|
while.end1699: ; preds = %while.cond1676
|
br i1 false, label %tryagain, label %sw.default1711
|
|
sw.default1711: ; preds = %while.end1699, %sw.bb1669, %tryagain
|
br label %defchar
|
|
defchar: ; preds = %sw.default1711, %sw.bb376
|
br i1 undef, label %if.end2413, label %if.then2368
|
|
if.then2368: ; preds = %defchar
|
unreachable
|
|
if.end2413: ; preds = %defchar
|
unreachable
|
|
return: ; preds = %sw.bb304
|
ret void
|
}
|
|
; PR11335: the most deeply nested block should be removed from the outer loop.
|
; CHECK-LABEL: @removeSubloopBlocks2(
|
; CHECK: for.cond3:
|
; CHECK-NOT: br
|
; CHECK: ret void
|
define void @removeSubloopBlocks2() nounwind {
|
entry:
|
%tobool.i = icmp ne i32 undef, 0
|
br label %lbl_616
|
|
lbl_616.loopexit: ; preds = %for.cond
|
br label %lbl_616
|
|
lbl_616: ; preds = %lbl_616.loopexit, %entry
|
br label %for.cond
|
|
for.cond: ; preds = %for.cond3, %lbl_616
|
br i1 false, label %for.cond1.preheader, label %lbl_616.loopexit
|
|
for.cond1.preheader: ; preds = %for.cond
|
br label %for.cond1
|
|
for.cond1.loopexit: ; preds = %for.cond.i
|
br label %for.cond1
|
|
for.cond1: ; preds = %for.cond1.loopexit, %for.cond1.preheader
|
br i1 false, label %for.body2, label %for.cond3
|
|
for.body2: ; preds = %for.cond1
|
br label %for.cond.i
|
|
for.cond.i: ; preds = %for.cond.i, %for.body2
|
br i1 %tobool.i, label %for.cond.i, label %for.cond1.loopexit
|
|
for.cond3: ; preds = %for.cond1
|
br i1 false, label %for.cond, label %if.end
|
|
if.end: ; preds = %for.cond3
|
ret void
|
}
|
