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[LoopBoundSplit] Ignore phi node which is not scevable

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There was a bug in LoopBoundSplit. The pass should ignore phi node which is not
scevable.

Differential Revision: https://reviews.llvm.org/D103913
This commit is contained in:
Jingu Kang 2021-06-08 18:24:38 +01:00
parent c90315c834
commit a06dee18e5
2 changed files with 82 additions and 1 deletions
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2
lib/Transforms/Scalar/LoopBoundSplit.cpp
View File

@ -371,7 +371,7 @@ static bool splitLoopBound(Loop &L, DominatorTree &DT, LoopInfo &LI,
// Replace IV's start value of post-loop by NewBound.
for (PHINode &PN : L.getHeader()->phis()) {
// Find PHI with exiting condition from pre-loop.
if (isa<SCEVAddRecExpr>(SE.getSCEV(&PN))) {
if (SE.isSCEVable(PN.getType()) && isa<SCEVAddRecExpr>(SE.getSCEV(&PN))) {
for (Value *Op : PN.incoming_values()) {
if (Op == ExitingCond.AddRecValue) {
// Find cloned PHI for post-loop.

81
test/Transforms/LoopBoundSplit/loop-bound-split.ll
View File

@ -450,4 +450,85 @@ exit:
ret void
}
; LoopBoundSplit pass should ignore phi which is not scevable phi.
define void @split_loop_bound_inc_with_sgt_and_is_not_scevable_phi(i64 %a, i64* noalias %src, i64* noalias %dst, i64 %n) {
; CHECK-LABEL: @split_loop_bound_inc_with_sgt_and_is_not_scevable_phi(
; CHECK-NEXT: loop.ph:
; CHECK-NEXT: br label [[LOOP_PH_SPLIT:%.*]]
; CHECK: loop.ph.split:
; CHECK-NEXT: [[SMAX:%.*]] = call i64 @llvm.smax.i64(i64 [[N:%.*]], i64 0)
; CHECK-NEXT: [[NEW_BOUND:%.*]] = call i64 @llvm.smin.i64(i64 [[A:%.*]], i64 [[SMAX]])
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IS_NOT_SCEVABLE_PHI:%.*]] = phi double [ 1.000000e+00, [[FOR_INC:%.*]] ], [ 2.000000e+00, [[LOOP_PH_SPLIT]] ]
; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[INC:%.*]], [[FOR_INC]] ], [ 0, [[LOOP_PH_SPLIT]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i64 [[IV]], [[A]]
; CHECK-NEXT: br i1 true, label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
; CHECK: if.then:
; CHECK-NEXT: [[SRC_ARRAYIDX:%.*]] = getelementptr inbounds i64, i64* [[SRC:%.*]], i64 [[IV]]
; CHECK-NEXT: [[VAL:%.*]] = load i64, i64* [[SRC_ARRAYIDX]], align 4
; CHECK-NEXT: [[DST_ARRAYIDX:%.*]] = getelementptr inbounds i64, i64* [[DST:%.*]], i64 [[IV]]
; CHECK-NEXT: store i64 [[VAL]], i64* [[DST_ARRAYIDX]], align 4
; CHECK-NEXT: br label [[FOR_INC]]
; CHECK: if.else:
; CHECK-NEXT: br label [[FOR_INC]]
; CHECK: for.inc:
; CHECK-NEXT: [[INC]] = add nuw nsw i64 [[IV]], 1
; CHECK-NEXT: [[COND:%.*]] = icmp sgt i64 [[INC]], [[NEW_BOUND]]
; CHECK-NEXT: br i1 [[COND]], label [[LOOP_PH_SPLIT_SPLIT:%.*]], label [[LOOP]]
; CHECK: loop.ph.split.split:
; CHECK-NEXT: [[INC_LCSSA:%.*]] = phi i64 [ [[INC]], [[FOR_INC]] ]
; CHECK-NEXT: [[TMP0:%.*]] = icmp ne i64 [[INC_LCSSA]], [[N]]
; CHECK-NEXT: br i1 [[TMP0]], label [[LOOP_SPLIT_PREHEADER:%.*]], label [[EXIT:%.*]]
; CHECK: loop.split.preheader:
; CHECK-NEXT: br label [[LOOP_SPLIT:%.*]]
; CHECK: loop.split:
; CHECK-NEXT: [[IS_NOT_SCEVABLE_PHI_SPLIT:%.*]] = phi double [ 1.000000e+00, [[FOR_INC_SPLIT:%.*]] ], [ 2.000000e+00, [[LOOP_SPLIT_PREHEADER]] ]
; CHECK-NEXT: [[IV_SPLIT:%.*]] = phi i64 [ [[INC_SPLIT:%.*]], [[FOR_INC_SPLIT]] ], [ [[NEW_BOUND]], [[LOOP_SPLIT_PREHEADER]] ]
; CHECK-NEXT: [[CMP_SPLIT:%.*]] = icmp slt i64 [[IV_SPLIT]], [[A]]
; CHECK-NEXT: br i1 false, label [[IF_THEN_SPLIT:%.*]], label [[IF_ELSE_SPLIT:%.*]]
; CHECK: if.else.split:
; CHECK-NEXT: br label [[FOR_INC_SPLIT]]
; CHECK: if.then.split:
; CHECK-NEXT: [[SRC_ARRAYIDX_SPLIT:%.*]] = getelementptr inbounds i64, i64* [[SRC]], i64 [[IV_SPLIT]]
; CHECK-NEXT: [[VAL_SPLIT:%.*]] = load i64, i64* [[SRC_ARRAYIDX_SPLIT]], align 4
; CHECK-NEXT: [[DST_ARRAYIDX_SPLIT:%.*]] = getelementptr inbounds i64, i64* [[DST]], i64 [[IV_SPLIT]]
; CHECK-NEXT: store i64 [[VAL_SPLIT]], i64* [[DST_ARRAYIDX_SPLIT]], align 4
; CHECK-NEXT: br label [[FOR_INC_SPLIT]]
; CHECK: for.inc.split:
; CHECK-NEXT: [[INC_SPLIT]] = add nuw nsw i64 [[IV_SPLIT]], 1
; CHECK-NEXT: [[COND_SPLIT:%.*]] = icmp sgt i64 [[INC_SPLIT]], [[N]]
; CHECK-NEXT: br i1 [[COND_SPLIT]], label [[EXIT_LOOPEXIT:%.*]], label [[LOOP_SPLIT]]
; CHECK: exit.loopexit:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret void
;
loop.ph:
br label %loop
loop:
%is_not_scevable_phi = phi double [ 1.0, %for.inc ], [ 2.0, %loop.ph ]
%iv = phi i64 [ %inc, %for.inc ], [ 0, %loop.ph ]
%cmp = icmp slt i64 %iv, %a
br i1 %cmp, label %if.then, label %if.else
if.then:
%src.arrayidx = getelementptr inbounds i64, i64* %src, i64 %iv
%val = load i64, i64* %src.arrayidx
%dst.arrayidx = getelementptr inbounds i64, i64* %dst, i64 %iv
store i64 %val, i64* %dst.arrayidx
br label %for.inc
if.else:
br label %for.inc
for.inc:
%inc = add nuw nsw i64 %iv, 1
%cond = icmp sgt i64 %inc, %n
br i1 %cond, label %exit, label %loop
exit:
ret void
}