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Do not assert, when case range split metric is zero and JTs are not allowed: just emit binary tree in this case. This

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fixes PR1403.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36959 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2007-05-09 20:07:08 +00:00
parent ab5063bed9
commit 7294b58ecd
2 changed files with 42 additions and 5 deletions
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17
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -1462,6 +1462,11 @@ bool SelectionDAGLowering::handleSmallSwitchRange(CaseRec& CR,
return true;
}
static inline bool areJTsAllowed(const TargetLowering &TLI) {
return (TLI.isOperationLegal(ISD::BR_JT, MVT::Other) ||
TLI.isOperationLegal(ISD::BRIND, MVT::Other));
}
/// handleJTSwitchCase - Emit jumptable for current switch case range
bool SelectionDAGLowering::handleJTSwitchCase(CaseRec& CR,
CaseRecVector& WorkList,
@ -1478,9 +1483,7 @@ bool SelectionDAGLowering::handleJTSwitchCase(CaseRec& CR,
I!=E; ++I)
TSize += I->size();
if ((!TLI.isOperationLegal(ISD::BR_JT, MVT::Other) &&
!TLI.isOperationLegal(ISD::BRIND, MVT::Other)) ||
TSize <= 3)
if (!areJTsAllowed(TLI) || TSize <= 3)
return false;
double Density = (double)TSize / (double)((Last - First) + 1ULL);
@ -1622,8 +1625,12 @@ bool SelectionDAGLowering::handleBTSplitSwitchCase(CaseRec& CR,
LSize += J->size();
RSize -= J->size();
}
// If our case is dense we *really* should handle it earlier!
assert((FMetric > 0) && "Should handle dense range earlier!");
if (areJTsAllowed(TLI)) {
// If our case is dense we *really* should handle it earlier!
assert((FMetric > 0) && "Should handle dense range earlier!");
} else {
Pivot = CR.Range.first + Size/2;
}
CaseRange LHSR(CR.Range.first, Pivot);
CaseRange RHSR(Pivot, CR.Range.second);

30
test/CodeGen/SPARC/2007-05-09-JumpTables.ll Normal file
View File

@ -0,0 +1,30 @@
; RUN: llvm-as < %s | llc -march=sparc
; We cannot emit jump tables on Sparc, but we should correctly handle this case.
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64"
define i32 @foo(i32 %f) {
entry:
switch i32 %f, label %bb14 [
i32 0, label %UnifiedReturnBlock
i32 1, label %bb4
i32 2, label %bb7
i32 3, label %bb10
]
bb4: ; preds = %entry
ret i32 2
bb7: ; preds = %entry
ret i32 5
bb10: ; preds = %entry
ret i32 9
bb14: ; preds = %entry
ret i32 0
UnifiedReturnBlock: ; preds = %entry
ret i32 1
}