Add a flag to disable jump table generation (all
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
diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp
index 1fe2e8c..fcf235c 100644
--- a/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -43,7 +43,7 @@
: TargetLowering(TM), PPCSubTarget(*TM.getSubtargetImpl()) {
setPow2DivIsCheap();
-
+
// Use _setjmp/_longjmp instead of setjmp/longjmp.
setUseUnderscoreSetJmp(true);
setUseUnderscoreLongJmp(true);
diff --git a/lib/Target/PowerPC/PPCTargetMachine.cpp b/lib/Target/PowerPC/PPCTargetMachine.cpp
index 8fa0809..7c90eca 100644
--- a/lib/Target/PowerPC/PPCTargetMachine.cpp
+++ b/lib/Target/PowerPC/PPCTargetMachine.cpp
@@ -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 @@
// 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);
}
diff --git a/lib/Target/TargetMachine.cpp b/lib/Target/TargetMachine.cpp
index 0764968..600a120 100644
--- a/lib/Target/TargetMachine.cpp
+++ b/lib/Target/TargetMachine.cpp
@@ -39,6 +39,7 @@
unsigned StackAlignment;
bool RealignStack;
bool VerboseAsm;
+ bool DisableJumpTables;
}
static cl::opt<bool, true> PrintCode("print-machineinstrs",
@@ -156,6 +157,11 @@
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