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Add a flag to disable jump table generation (all

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switches use the binary search algorithm) for
environments that don't support it.  PPC64 JIT
is such an environment; turn the flag on for that.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54248 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2008-07-31 18:13:12 +00:00
parent 75dcf08243
commit 7232464bda
5 changed files with 18 additions and 3 deletions
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4
include/llvm/Target/TargetOptions.h
View File

@ -97,6 +97,10 @@ namespace llvm {
/// VerboseAsm - When this flag is set, the asm printer prints additional
/// comments to asm directives.
extern bool VerboseAsm;
/// DisableJumpTables - This flag indicates jump tables should not be
/// generated.
extern bool DisableJumpTables;
} // End llvm namespace
#endif

3
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -1916,7 +1916,8 @@ bool SelectionDAGLowering::handleSmallSwitchRange(CaseRec& CR,
}
static inline bool areJTsAllowed(const TargetLowering &TLI) {
return (TLI.isOperationLegal(ISD::BR_JT, MVT::Other) ||
return !DisableJumpTables &&
(TLI.isOperationLegal(ISD::BR_JT, MVT::Other) ||
TLI.isOperationLegal(ISD::BRIND, MVT::Other));
}

4
lib/Target/PowerPC/PPCTargetMachine.cpp
View File

@ -17,6 +17,7 @@
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/Target/TargetMachineRegistry.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
// Register the targets
@ -144,6 +145,9 @@ bool PPCTargetMachine::addCodeEmitter(PassManagerBase &PM, bool Fast,
// instructions to materialize arbitrary global variable + function +
// constant pool addresses.
setRelocationModel(Reloc::PIC_);
// Temporary workaround for the inability of PPC64 JIT to handle jump
// tables.
DisableJumpTables = true;
} else {
setRelocationModel(Reloc::Static);
}

6
lib/Target/TargetMachine.cpp
View File

@ -39,6 +39,7 @@ namespace llvm {
unsigned StackAlignment;
bool RealignStack;
bool VerboseAsm;
bool DisableJumpTables;
}
static cl::opt<bool, true> PrintCode("print-machineinstrs",
@ -156,6 +157,11 @@ AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
cl::location(VerboseAsm),
cl::init(false));
static cl::opt<bool, true>
DisableSwitchTables(cl::Hidden, "disable-jump-tables",
cl::desc("Do not generate jump tables."),
cl::location(DisableJumpTables),
cl::init(false));
//---------------------------------------------------------------------------
// TargetMachine Class