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

2 files changed, 5 insertions, 1 deletions

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 @@ PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM)
   : 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 @@ 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);
   }