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[CodeGen] Fix formatting and comments (NFC)

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llvm-svn: 363947
This commit is contained in:
Evandro Menezes 2019-06-20 16:34:00 +00:00
parent c539a36302
commit 313a4271cb
5 changed files with 94 additions and 92 deletions
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4
include/llvm/CodeGen/SwitchLoweringUtils.h
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@ -199,11 +199,11 @@ struct BitTestBlock {
Cases(std::move(C)), Prob(Pr) {}
};
/// Return the range of value in [First..Last].
/// Return the range of value within a range.
uint64_t getJumpTableRange(const CaseClusterVector &Clusters, unsigned First,
unsigned Last);
/// Return the number of cases in [First..Last].
/// Return the number of cases within a range.
uint64_t getJumpTableNumCases(const SmallVectorImpl<unsigned> &TotalCases,
unsigned First, unsigned Last);

1
include/llvm/CodeGen/TargetLowering.h
View File

@ -983,6 +983,7 @@ public:
const unsigned MinDensity = getMinimumJumpTableDensity(OptForSize);
const unsigned MaxJumpTableSize =
OptForSize ? UINT_MAX : getMaximumJumpTableSize();
// Check whether a range of clusters is dense enough for a jump table.
if (Range <= MaxJumpTableSize &&
(NumCases * 100 >= Range * MinDensity)) {

14
lib/CodeGen/SwitchLoweringUtils.cpp
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@ -27,7 +27,6 @@ uint64_t SwitchCG::getJumpTableRange(const CaseClusterVector &Clusters,
// FIXME: A range of consecutive cases has 100% density, but only requires one
// comparison to lower. We should discriminate against such consecutive ranges
// in jump tables.
return (HighCase - LowCase).getLimitedValue((UINT64_MAX - 1) / 100) + 1;
}
@ -56,14 +55,15 @@ void SwitchCG::SwitchLowering::findJumpTables(CaseClusterVector &Clusters,
if (!TLI->areJTsAllowed(SI->getParent()->getParent()))
return;
const int64_t N = Clusters.size();
const unsigned MinJumpTableEntries = TLI->getMinimumJumpTableEntries();
const unsigned SmallNumberOfEntries = MinJumpTableEntries / 2;
// Bail if not enough cases.
const int64_t N = Clusters.size();
if (N < 2 || N < MinJumpTableEntries)
return;
// TotalCases[i]: Total nbr of cases in Clusters[0..i].
// Accumulated number of cases in each cluster and those prior to it.
SmallVector<unsigned, 8> TotalCases(N);
for (unsigned i = 0; i < N; ++i) {
const APInt &Hi = Clusters[i].High->getValue();
@ -73,11 +73,12 @@ void SwitchCG::SwitchLowering::findJumpTables(CaseClusterVector &Clusters,
TotalCases[i] += TotalCases[i - 1];
}
// Cheap case: the whole range may be suitable for jump table.
uint64_t Range = getJumpTableRange(Clusters,0, N - 1);
uint64_t NumCases = getJumpTableNumCases(TotalCases, 0, N - 1);
assert(NumCases < UINT64_MAX / 100);
assert(Range >= NumCases);
// Cheap case: the whole range may be suitable for jump table.
if (TLI->isSuitableForJumpTable(SI, NumCases, Range)) {
CaseCluster JTCluster;
if (buildJumpTable(Clusters, 0, N - 1, SI, DefaultMBB, JTCluster)) {
@ -131,10 +132,11 @@ void SwitchCG::SwitchLowering::findJumpTables(CaseClusterVector &Clusters,
// Search for a solution that results in fewer partitions.
for (int64_t j = N - 1; j > i; j--) {
// Try building a partition from Clusters[i..j].
uint64_t Range = getJumpTableRange(Clusters, i, j);
uint64_t NumCases = getJumpTableNumCases(TotalCases, i, j);
Range = getJumpTableRange(Clusters, i, j);
NumCases = getJumpTableNumCases(TotalCases, i, j);
assert(NumCases < UINT64_MAX / 100);
assert(Range >= NumCases);
if (TLI->isSuitableForJumpTable(SI, NumCases, Range)) {
unsigned NumPartitions = 1 + (j == N - 1 ? 0 : MinPartitions[j + 1]);
unsigned Score = j == N - 1 ? 0 : PartitionsScore[j + 1];

166
test/CodeGen/AArch64/max-jump-table.ll
View File

@ -10,15 +10,15 @@ declare void @ext(i32, i32)
define i32 @jt1(i32 %a, i32 %b) {
entry:
switch i32 %a, label %return [
i32 1, label %bb1
i32 2, label %bb2
i32 3, label %bb3
i32 4, label %bb4
i32 5, label %bb5
i32 6, label %bb6
i32 7, label %bb7
i32 8, label %bb8
i32 9, label %bb9
i32 1, label %bb1
i32 2, label %bb2
i32 3, label %bb3
i32 4, label %bb4
i32 5, label %bb5
i32 6, label %bb6
i32 7, label %bb7
i32 8, label %bb8
i32 9, label %bb9
i32 10, label %bb10
i32 11, label %bb11
i32 12, label %bb12
@ -30,33 +30,33 @@ entry:
]
; CHECK-LABEL: function jt1:
; CHECK-NEXT: Jump Tables:
; CHECK0-NEXT: %jump-table.0: %bb.1 %bb.2 %bb.3 %bb.4 %bb.5 %bb.6 %bb.7 %bb.8 %bb.9 %bb.10 %bb.11 %bb.12 %bb.13 %bb.14 %bb.15 %bb.16 %bb.17
; CHECK0-NOT: %jump-table.1:
; CHECK4-NEXT: %jump-table.0: %bb.2 %bb.3 %bb.4 %bb.5
; CHECK4-SAME: %jump-table.1: %bb.6 %bb.7 %bb.8 %bb.9
; CHECK4-SAME: %jump-table.2: %bb.10 %bb.11 %bb.12 %bb.13
; CHECK4-SAME: %jump-table.3: %bb.14 %bb.15 %bb.16 %bb.17
; CHECK4-NOT: %jump-table.4:
; CHECK8-NEXT: %jump-table.0: %bb.2 %bb.3 %bb.4 %bb.5 %bb.6 %bb.7 %bb.8 %bb.9
; CHECK8-SAME: %jump-table.1: %bb.10 %bb.11 %bb.12 %bb.13 %bb.14 %bb.15 %bb.16 %bb.17
; CHECK8-NOT: %jump-table.2:
; CHECK16-NEXT: %jump-table.0: %bb.2 %bb.3 %bb.4 %bb.5 %bb.6 %bb.7 %bb.8 %bb.9 %bb.10 %bb.11 %bb.12 %bb.13 %bb.14 %bb.15 %bb.16 %bb.17
; CHECK16-NOT: %jump-table.1:
; CHECKM1-NEXT: %jump-table.0: %bb.2 %bb.3 %bb.4 %bb.5 %bb.6 %bb.7 %bb.8 %bb.9
; CHECKM1-SAME: %jump-table.1: %bb.10 %bb.11 %bb.12 %bb.13 %bb.14 %bb.15 %bb.16 %bb.17
; CHECKM1-NOT: %jump-table.2:
; CHECKM3-NEXT: %jump-table.0: %bb.1 %bb.2 %bb.3 %bb.4 %bb.5 %bb.6 %bb.7 %bb.8 %bb.9 %bb.10 %bb.11 %bb.12 %bb.13 %bb.14 %bb.15 %bb.16 %bb.17
; CHECKM3-NOT: %jump-table.1:
; CHECK0-NEXT: %jump-table.0: %bb.1 %bb.2 %bb.3 %bb.4 %bb.5 %bb.6 %bb.7 %bb.8 %bb.9 %bb.10 %bb.11 %bb.12 %bb.13 %bb.14 %bb.15 %bb.16 %bb.17
; CHECK0-NOT: %jump-table.1:
; CHECK4-NEXT: %jump-table.0: %bb.2 %bb.3 %bb.4 %bb.5
; CHECK4-SAME: %jump-table.1: %bb.6 %bb.7 %bb.8 %bb.9
; CHECK4-SAME: %jump-table.2: %bb.10 %bb.11 %bb.12 %bb.13
; CHECK4-SAME: %jump-table.3: %bb.14 %bb.15 %bb.16 %bb.17
; CHECK4-NOT: %jump-table.4:
; CHECK8-NEXT: %jump-table.0: %bb.2 %bb.3 %bb.4 %bb.5 %bb.6 %bb.7 %bb.8 %bb.9
; CHECK8-SAME: %jump-table.1: %bb.10 %bb.11 %bb.12 %bb.13 %bb.14 %bb.15 %bb.16 %bb.17
; CHECK8-NOT: %jump-table.2:
; CHECK16-NEXT: %jump-table.0: %bb.2 %bb.3 %bb.4 %bb.5 %bb.6 %bb.7 %bb.8 %bb.9 %bb.10 %bb.11 %bb.12 %bb.13 %bb.14 %bb.15 %bb.16 %bb.17
; CHECK16-NOT: %jump-table.1:
; CHECKM1-NEXT: %jump-table.0: %bb.2 %bb.3 %bb.4 %bb.5 %bb.6 %bb.7 %bb.8 %bb.9
; CHECKM1-SAME: %jump-table.1: %bb.10 %bb.11 %bb.12 %bb.13 %bb.14 %bb.15 %bb.16 %bb.17
; CHECKM1-NOT: %jump-table.2:
; CHECKM3-NEXT: %jump-table.0: %bb.1 %bb.2 %bb.3 %bb.4 %bb.5 %bb.6 %bb.7 %bb.8 %bb.9 %bb.10 %bb.11 %bb.12 %bb.13 %bb.14 %bb.15 %bb.16 %bb.17
; CHECKM3-NOT: %jump-table.1:
bb1: tail call void @ext(i32 1, i32 0) br label %return
bb2: tail call void @ext(i32 2, i32 2) br label %return
bb3: tail call void @ext(i32 3, i32 4) br label %return
bb4: tail call void @ext(i32 4, i32 6) br label %return
bb5: tail call void @ext(i32 5, i32 8) br label %return
bb6: tail call void @ext(i32 6, i32 10) br label %return
bb7: tail call void @ext(i32 7, i32 12) br label %return
bb8: tail call void @ext(i32 8, i32 14) br label %return
bb9: tail call void @ext(i32 9, i32 16) br label %return
bb1: tail call void @ext(i32 1, i32 0) br label %return
bb2: tail call void @ext(i32 2, i32 2) br label %return
bb3: tail call void @ext(i32 3, i32 4) br label %return
bb4: tail call void @ext(i32 4, i32 6) br label %return
bb5: tail call void @ext(i32 5, i32 8) br label %return
bb6: tail call void @ext(i32 6, i32 10) br label %return
bb7: tail call void @ext(i32 7, i32 12) br label %return
bb8: tail call void @ext(i32 8, i32 14) br label %return
bb9: tail call void @ext(i32 9, i32 16) br label %return
bb10: tail call void @ext(i32 1, i32 18) br label %return
bb11: tail call void @ext(i32 2, i32 20) br label %return
bb12: tail call void @ext(i32 3, i32 22) br label %return
@ -72,28 +72,28 @@ return: ret i32 %b
define void @jt2(i32 %x) {
entry:
switch i32 %x, label %return [
i32 1, label %bb1
i32 2, label %bb2
i32 3, label %bb3
i32 4, label %bb4
i32 1, label %bb1
i32 2, label %bb2
i32 3, label %bb3
i32 4, label %bb4
i32 14, label %bb5
i32 15, label %bb6
]
; CHECK-LABEL: function jt2:
; CHECK-NEXT: Jump Tables:
; CHECK0-NEXT: %jump-table.0: %bb.1 %bb.2 %bb.3 %bb.4 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.5 %bb.6{{$}}
; CHECK0-NOT: %jump-table.1
; CHECK4-NEXT: %jump-table.0: %bb.1 %bb.2 %bb.3 %bb.4{{$}}
; CHECK4-NOT: %jump-table.1
; CHECK8-NEXT: %jump-table.0: %bb.1 %bb.2 %bb.3 %bb.4{{$}}
; CHECK8-NOT: %jump-table.1
; CHECK16-NEXT: %jump-table.0: %bb.1 %bb.2 %bb.3 %bb.4 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.5 %bb.6{{$}}
; CHECK16-NOT: %jump-table.1:
; CHECKM1-NEXT: %jump-table.0: %bb.1 %bb.2 %bb.3 %bb.4{{$}}
; CHECKM1-NOT: %jump-table.1
; CHECKM3-NEXT: %jump-table.0: %bb.1 %bb.2 %bb.3 %bb.4 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.5 %bb.6{{$}}
; CHECKM3-NOT: %jump-table.1
; CHECK0-NEXT: %jump-table.0: %bb.1 %bb.2 %bb.3 %bb.4 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.5 %bb.6{{$}}
; CHECK0-NOT: %jump-table.1
; CHECK4-NEXT: %jump-table.0: %bb.1 %bb.2 %bb.3 %bb.4{{$}}
; CHECK4-NOT: %jump-table.1
; CHECK8-NEXT: %jump-table.0: %bb.1 %bb.2 %bb.3 %bb.4{{$}}
; CHECK8-NOT: %jump-table.1
; CHECK16-NEXT: %jump-table.0: %bb.1 %bb.2 %bb.3 %bb.4 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.5 %bb.6{{$}}
; CHECK16-NOT: %jump-table.1:
; CHECKM1-NEXT: %jump-table.0: %bb.1 %bb.2 %bb.3 %bb.4{{$}}
; CHECKM1-NOT: %jump-table.1
; CHECKM3-NEXT: %jump-table.0: %bb.1 %bb.2 %bb.3 %bb.4 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.7 %bb.5 %bb.6{{$}}
; CHECKM3-NOT: %jump-table.1
; CHECK-DAG: End machine code for function jt2.
bb1: tail call void @ext(i32 6, i32 1) br label %return
@ -108,10 +108,10 @@ return: ret void
define void @jt3(i32 %x) {
entry:
switch i32 %x, label %return [
i32 1, label %bb1
i32 2, label %bb2
i32 3, label %bb3
i32 4, label %bb4
i32 1, label %bb1
i32 2, label %bb2
i32 3, label %bb3
i32 4, label %bb4
i32 14, label %bb5
i32 15, label %bb6
@ -144,18 +144,18 @@ entry:
; CHECKM3-NOT: %jump-table.1
; CHECK-DAG: End machine code for function jt3.
bb1: tail call void @ext(i32 1, i32 12) br label %return
bb2: tail call void @ext(i32 2, i32 11) br label %return
bb3: tail call void @ext(i32 3, i32 10) br label %return
bb4: tail call void @ext(i32 4, i32 9) br label %return
bb5: tail call void @ext(i32 5, i32 8) br label %return
bb6: tail call void @ext(i32 6, i32 7) br label %return
bb7: tail call void @ext(i32 7, i32 6) br label %return
bb8: tail call void @ext(i32 8, i32 5) br label %return
bb9: tail call void @ext(i32 9, i32 4) br label %return
bb10: tail call void @ext(i32 10, i32 3) br label %return
bb11: tail call void @ext(i32 11, i32 2) br label %return
bb12: tail call void @ext(i32 12, i32 1) br label %return
bb1: tail call void @ext(i32 1, i32 12) br label %return
bb2: tail call void @ext(i32 2, i32 11) br label %return
bb3: tail call void @ext(i32 3, i32 10) br label %return
bb4: tail call void @ext(i32 4, i32 9) br label %return
bb5: tail call void @ext(i32 5, i32 8) br label %return
bb6: tail call void @ext(i32 6, i32 7) br label %return
bb7: tail call void @ext(i32 7, i32 6) br label %return
bb8: tail call void @ext(i32 8, i32 5) br label %return
bb9: tail call void @ext(i32 9, i32 4) br label %return
bb10: tail call void @ext(i32 10, i32 3) br label %return
bb11: tail call void @ext(i32 11, i32 2) br label %return
bb12: tail call void @ext(i32 12, i32 1) br label %return
return: ret void
}
@ -163,10 +163,10 @@ return: ret void
define void @jt4(i32 %x) {
entry:
switch i32 %x, label %default [
i32 1, label %bb1
i32 2, label %bb2
i32 3, label %bb3
i32 4, label %bb4
i32 1, label %bb1
i32 2, label %bb2
i32 3, label %bb3
i32 4, label %bb4
i32 14, label %bb5
i32 15, label %bb6
@ -199,18 +199,18 @@ entry:
; CHECKM3-NOT: %jump-table.1
; CHECK-DAG: End machine code for function jt4.
bb1: tail call void @ext(i32 1, i32 12) br label %return
bb2: tail call void @ext(i32 2, i32 11) br label %return
bb3: tail call void @ext(i32 3, i32 10) br label %return
bb4: tail call void @ext(i32 4, i32 9) br label %return
bb5: tail call void @ext(i32 5, i32 8) br label %return
bb6: tail call void @ext(i32 6, i32 7) br label %return
bb7: tail call void @ext(i32 7, i32 6) br label %return
bb8: tail call void @ext(i32 8, i32 5) br label %return
bb9: tail call void @ext(i32 9, i32 4) br label %return
bb10: tail call void @ext(i32 10, i32 3) br label %return
bb11: tail call void @ext(i32 11, i32 2) br label %return
bb12: tail call void @ext(i32 12, i32 1) br label %return
bb1: tail call void @ext(i32 1, i32 12) br label %return
bb2: tail call void @ext(i32 2, i32 11) br label %return
bb3: tail call void @ext(i32 3, i32 10) br label %return
bb4: tail call void @ext(i32 4, i32 9) br label %return
bb5: tail call void @ext(i32 5, i32 8) br label %return
bb6: tail call void @ext(i32 6, i32 7) br label %return
bb7: tail call void @ext(i32 7, i32 6) br label %return
bb8: tail call void @ext(i32 8, i32 5) br label %return
bb9: tail call void @ext(i32 9, i32 4) br label %return
bb10: tail call void @ext(i32 10, i32 3) br label %return
bb11: tail call void @ext(i32 11, i32 2) br label %return
bb12: tail call void @ext(i32 12, i32 1) br label %return
default: unreachable
return: ret void

1
test/CodeGen/AArch64/min-jump-table.ll
View File

@ -71,4 +71,3 @@ bb8: tail call void @ext(i32 8, i32 14) br label %return
return: ret i32 %b
}