caio/clang-p2996
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
4794bbffb228894de3ca0dad50fc027eb94f743e
clang-p2996/llvm/test/Transforms/LoopUnroll/unloop.ll
Nikita Popov 1ae266f452 [LoopUnroll] Use smallest exact trip count from any exit 
This is a more general alternative/extension to D102635. Rather than
handling the special case of "header exit with non-exiting latch",
this unrolls against the smallest exact trip count from any exit.
The latch exit is no longer treated as priviledged when it comes to
full unrolling.

The motivating case is in full-unroll-one-unpredictable-exit.ll.
Here the header exit is an IV-based exit, while the latch exit is
a data comparison. This kind of loop does not get rotated, because
the latch is already exiting, and loop rotation doesn't try to
distinguish IV-based/analyzable latches.

Differential Revision: https://reviews.llvm.org/D102982
2021-06-20 20:58:26 +02:00

671 lines
21 KiB
LLVM
Raw Blame History

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -S -loop-unroll -verify-loop-info | FileCheck %s
; RUN: opt < %s -S -passes='require<opt-remark-emit>,loop-unroll,verify<loops>' | 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.
define void @skiplevelexit() nounwind {
; CHECK-LABEL: @skiplevelexit(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[OUTER:%.*]]
; CHECK: outer:
; CHECK-NEXT: br label [[INNER:%.*]]
; CHECK: inner:
; CHECK-NEXT: [[TMP0:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 true, label [[OUTER_BACKEDGE:%.*]], label [[TAIL:%.*]]
; CHECK: tail:
; CHECK-NEXT: ret void
; CHECK: outer.backedge:
; CHECK-NEXT: br label [[OUTER]]
;
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.
define void @unloopNested() {
; CHECK-LABEL: @unloopNested(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[WHILE_COND_OUTER:%.*]]
; CHECK: while.cond.outer:
; CHECK-NEXT: br label [[WHILE_COND:%.*]]
; CHECK: while.cond:
; CHECK-NEXT: [[CMP:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP]], label [[WHILE_BODY:%.*]], label [[WHILE_END:%.*]]
; CHECK: while.body:
; CHECK-NEXT: [[CMP3:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP3]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
; CHECK: if.then:
; CHECK-NEXT: br label [[RETURN:%.*]]
; CHECK: if.end:
; CHECK-NEXT: [[CMP_I48:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP_I48]], label [[IF_THEN_I:%.*]], label [[IF_ELSE20_I:%.*]]
; CHECK: if.then.i:
; CHECK-NEXT: [[CMP8_I:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP8_I]], label [[MERGE:%.*]], label [[IF_ELSE_I:%.*]]
; CHECK: if.else.i:
; CHECK-NEXT: br label [[MERGE]]
; CHECK: if.else20.i:
; CHECK-NEXT: [[CMP25_I:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP25_I]], label [[MERGE]], label [[IF_ELSE28_I:%.*]]
; CHECK: if.else28.i:
; CHECK-NEXT: br label [[MERGE]]
; CHECK: merge:
; CHECK-NEXT: br label [[WHILE_COND2_I:%.*]]
; CHECK: while.cond2.i:
; CHECK-NEXT: [[CMP_I:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP_I]], label [[WHILE_COND2_BACKEDGE_I:%.*]], label [[WHILE_END_I:%.*]]
; CHECK: while.cond2.backedge.i:
; CHECK-NEXT: br label [[WHILE_COND2_I]]
; CHECK: while.end.i:
; CHECK-NEXT: [[CMP1114_I:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP1114_I]], label [[WHILE_BODY12_LR_PH_I:%.*]], label [[WHILE_END14_I:%.*]]
; CHECK: while.body12.lr.ph.i:
; CHECK-NEXT: br label [[WHILE_END14_I]]
; CHECK: while.end14.i:
; CHECK-NEXT: [[CALL15_I:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CALL15_I]], label [[IF_END_I:%.*]], label [[EXIT:%.*]]
; CHECK: if.end.i:
; CHECK-NEXT: br label [[WHILE_COND2_BACKEDGE_I]]
; CHECK: exit:
; CHECK-NEXT: br label [[WHILE_COND_OUTER]]
; CHECK: while.end:
; CHECK-NEXT: br label [[RETURN]]
; CHECK: return:
; CHECK-NEXT: ret void
;
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()
br i1 %cmp.i48, label %if.then.i, label %if.else20.i
if.then.i:
%cmp8.i = call zeroext i1 @check()
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()
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()
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.
define void @unloopDeepNested() nounwind {
; CHECK-LABEL: @unloopDeepNested(
; CHECK-NEXT: for.cond8.preheader.i:
; CHECK-NEXT: [[CMP113_I:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP113_I]], label [[MAKE_DATA_EXIT:%.*]], label [[FOR_BODY13_LR_PH_I:%.*]]
; CHECK: for.body13.lr.ph.i:
; CHECK-NEXT: br label [[MAKE_DATA_EXIT]]
; CHECK: make_data.exit:
; CHECK-NEXT: br label [[WHILE_COND_OUTER_OUTER:%.*]]
; CHECK: while.cond.outer.outer:
; CHECK-NEXT: br label [[WHILE_COND_OUTER:%.*]]
; CHECK: while.cond.outer:
; CHECK-NEXT: br label [[WHILE_COND:%.*]]
; CHECK: while.cond:
; CHECK-NEXT: br label [[WHILE_COND_OUTER_I:%.*]]
; CHECK: while.cond.outer.i:
; CHECK-NEXT: [[TMP192_PH_I:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[TMP192_PH_I]], label [[WHILE_COND_OUTER_SPLIT_US_I:%.*]], label [[WHILE_BODY_LOOPEXIT:%.*]]
; CHECK: while.cond.outer.split.us.i:
; CHECK-NEXT: br label [[WHILE_COND_US_I:%.*]]
; CHECK: while.cond.us.i:
; CHECK-NEXT: [[CMP_US_I:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP_US_I]], label [[NEXT_DATA_EXIT:%.*]], label [[WHILE_BODY_US_I:%.*]]
; CHECK: while.body.us.i:
; CHECK-NEXT: [[CMP7_US_I:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP7_US_I]], label [[IF_THEN_US_I:%.*]], label [[IF_ELSE_I:%.*]]
; CHECK: if.then.us.i:
; CHECK-NEXT: br label [[WHILE_COND_US_I]]
; CHECK: if.else.i:
; CHECK-NEXT: br label [[WHILE_COND_OUTER_I]]
; CHECK: next_data.exit:
; CHECK-NEXT: [[TMP192_PH_I_LCSSA28:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[TMP192_PH_I_LCSSA28]], label [[WHILE_END:%.*]], label [[WHILE_BODY:%.*]]
; CHECK: while.body.loopexit:
; CHECK-NEXT: br label [[WHILE_BODY]]
; CHECK: while.body:
; CHECK-NEXT: br label [[WHILE_COND_I:%.*]]
; CHECK: while.cond.i:
; CHECK-NEXT: [[CMP_I:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP_I]], label [[VALID_DATA_EXIT:%.*]], label [[WHILE_BODY_I:%.*]]
; CHECK: while.body.i:
; CHECK-NEXT: [[CMP7_I:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP7_I]], label [[VALID_DATA_EXIT]], label [[IF_END_I:%.*]]
; CHECK: if.end.i:
; CHECK-NEXT: br label [[WHILE_COND_I]]
; CHECK: valid_data.exit:
; CHECK-NEXT: [[CMP:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP]], label [[IF_THEN12:%.*]], label [[IF_END:%.*]]
; CHECK: if.then12:
; CHECK-NEXT: br label [[IF_END]]
; CHECK: if.end:
; CHECK-NEXT: [[TOBOOL3_I:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[TOBOOL3_I]], label [[COPY_DATA_EXIT:%.*]], label [[WHILE_BODY_LR_PH_I:%.*]]
; CHECK: while.body.lr.ph.i:
; CHECK-NEXT: br label [[COPY_DATA_EXIT]]
; CHECK: copy_data.exit:
; CHECK-NEXT: [[CMP38:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP38]], label [[IF_THEN39:%.*]], label [[WHILE_COND_OUTER]]
; CHECK: if.then39:
; CHECK-NEXT: [[CMP5_I:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP5_I]], label [[WHILE_COND_OUTER_OUTER_BACKEDGE:%.*]], label [[FOR_COND8_PREHEADER_I8_THREAD:%.*]]
; CHECK: for.cond8.preheader.i8.thread:
; CHECK-NEXT: br label [[WHILE_COND_OUTER_OUTER_BACKEDGE]]
; CHECK: while.cond.outer.outer.backedge:
; CHECK-NEXT: br label [[WHILE_COND_OUTER_OUTER]]
; CHECK: while.end:
; CHECK-NEXT: ret void
;
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.
define void @unloopIrreducible() nounwind {
; CHECK-LABEL: @unloopIrreducible(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_BODY:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[CMP2113:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP2113]], label [[FOR_BODY22_LR_PH:%.*]], label [[FOR_INC163:%.*]]
; CHECK: for.body22.lr.ph:
; CHECK-NEXT: br label [[FOR_BODY22:%.*]]
; CHECK: for.body22:
; CHECK-NEXT: br label [[FOR_BODY33:%.*]]
; CHECK: for.body33:
; CHECK-NEXT: br label [[FOR_END:%.*]]
; CHECK: for.end:
; CHECK-NEXT: [[CMP424:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP424]], label [[FOR_BODY43_LR_PH:%.*]], label [[FOR_END93:%.*]]
; CHECK: for.body43.lr.ph:
; CHECK-NEXT: br label [[FOR_END93]]
; CHECK: for.end93:
; CHECK-NEXT: [[CMP96:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP96]], label [[IF_THEN97:%.*]], label [[FOR_COND103:%.*]]
; CHECK: if.then97:
; CHECK-NEXT: br label [[FOR_COND103T:%.*]]
; CHECK: for.cond103t:
; CHECK-NEXT: br label [[FOR_COND103]]
; CHECK: for.cond103:
; CHECK-NEXT: [[CMP105:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP105]], label [[FOR_BODY106:%.*]], label [[FOR_END120:%.*]]
; CHECK: for.body106:
; CHECK-NEXT: [[CMP108:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP108]], label [[IF_THEN109:%.*]], label [[FOR_INC117:%.*]]
; CHECK: if.then109:
; CHECK-NEXT: br label [[FOR_INC117]]
; CHECK: for.inc117:
; CHECK-NEXT: br label [[FOR_COND103T]]
; CHECK: for.end120:
; CHECK-NEXT: br label [[FOR_INC159:%.*]]
; CHECK: for.inc159:
; CHECK-NEXT: br label [[FOR_INC163]]
; CHECK: for.inc163:
; CHECK-NEXT: [[CMP12:%.*]] = call zeroext i1 @check()
; CHECK-NEXT: br i1 [[CMP12]], label [[FOR_BODY]], label [[FOR_END166:%.*]]
; CHECK: for.end166:
; CHECK-NEXT: ret void
;
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.
define void @unloopCriticalEdge() nounwind {
; CHECK-LABEL: @unloopCriticalEdge(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_COND31:%.*]]
; CHECK: for.cond31:
; CHECK-NEXT: br i1 false, label [[FOR_BODY35:%.*]], label [[FOR_END94:%.*]]
; CHECK: for.body35:
; CHECK-NEXT: br label [[WHILE_COND_I_PREHEADER:%.*]]
; CHECK: while.cond.i.preheader:
; CHECK-NEXT: br i1 undef, label [[WHILE_COND_I_PREHEADER_SPLIT:%.*]], label [[WHILE_COND_OUTER_I_LOOPEXIT_SPLIT:%.*]]
; CHECK: while.cond.i.preheader.split:
; CHECK-NEXT: br label [[WHILE_COND_I:%.*]]
; CHECK: while.cond.i:
; CHECK-NEXT: br i1 true, label [[WHILE_COND_I]], label [[WHILE_COND_OUTER_I_LOOPEXIT:%.*]]
; CHECK: while.cond.outer.i.loopexit:
; CHECK-NEXT: br label [[WHILE_COND_OUTER_I_LOOPEXIT_SPLIT]]
; CHECK: while.cond.outer.i.loopexit.split:
; CHECK-NEXT: br label [[WHILE_BODY:%.*]]
; CHECK: while.body:
; CHECK-NEXT: br label [[FOR_END78:%.*]]
; CHECK: for.end78:
; CHECK-NEXT: br i1 false, label [[PROC2_EXIT:%.*]], label [[FOR_COND_I_PREHEADER:%.*]]
; CHECK: for.cond.i.preheader:
; CHECK-NEXT: br label [[FOR_COND_I:%.*]]
; CHECK: for.cond.i:
; CHECK-NEXT: br label [[FOR_COND_I]]
; CHECK: Proc2.exit:
; CHECK-NEXT: unreachable
; CHECK: for.end94:
; CHECK-NEXT: ret void
;
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.
define void @removeSubloopBlocks() nounwind {
; CHECK-LABEL: @removeSubloopBlocks(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[TRYAGAIN_OUTER:%.*]]
; CHECK: tryagain.outer:
; CHECK-NEXT: br label [[TRYAGAIN:%.*]]
; CHECK: tryagain:
; CHECK-NEXT: br i1 false, label [[SW_BB1669:%.*]], label [[SW_BB304:%.*]]
; CHECK: sw.bb304:
; CHECK-NEXT: ret void
; CHECK: sw.bb1669:
; CHECK-NEXT: br i1 true, label [[SW_DEFAULT1711:%.*]], label [[WHILE_COND1676_PREHEADER:%.*]]
; CHECK: while.cond1676.preheader:
; CHECK-NEXT: br label [[WHILE_COND1676:%.*]]
; CHECK: while.cond1676:
; CHECK-NEXT: br i1 true, label [[WHILE_END1699:%.*]], label [[WHILE_BODY1694:%.*]]
; CHECK: while.body1694:
; CHECK-NEXT: unreachable
; CHECK: while.end1699:
; CHECK-NEXT: br label [[SW_DEFAULT1711]]
; CHECK: sw.default1711:
; CHECK-NEXT: br label [[DEFCHAR:%.*]]
; CHECK: defchar:
; CHECK-NEXT: br i1 undef, label [[IF_END2413:%.*]], label [[IF_THEN2368:%.*]]
; CHECK: if.then2368:
; CHECK-NEXT: unreachable
; CHECK: if.end2413:
; CHECK-NEXT: unreachable
;
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.
define void @removeSubloopBlocks2() nounwind {
; CHECK-LABEL: @removeSubloopBlocks2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TOBOOL_I:%.*]] = icmp ne i32 undef, 0
; CHECK-NEXT: br label [[LBL_616:%.*]]
; CHECK: lbl_616.loopexit:
; CHECK-NEXT: br label [[LBL_616]]
; CHECK: lbl_616:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
; CHECK-NEXT: br i1 false, label [[FOR_COND1_PREHEADER:%.*]], label [[LBL_616_LOOPEXIT:%.*]]
; CHECK: for.cond1.preheader:
; CHECK-NEXT: br label [[FOR_COND1:%.*]]
; CHECK: for.cond1.loopexit:
; CHECK-NEXT: unreachable
; CHECK: for.cond1:
; CHECK-NEXT: br i1 false, label [[FOR_BODY2:%.*]], label [[FOR_COND3:%.*]]
; CHECK: for.body2:
; CHECK-NEXT: br label [[FOR_COND_I:%.*]]
; CHECK: for.cond.i:
; CHECK-NEXT: br i1 [[TOBOOL_I]], label [[FOR_COND_I]], label [[FOR_COND1_LOOPEXIT:%.*]]
; CHECK: for.cond3:
; CHECK-NEXT: ret void
;
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
}
Reference in New Issue View Git Blame Copy Permalink