#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/Object/MachOFormat.h"
+#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetAsmBackend.h"
using namespace llvm;
+// Option to allow disabling arithmetic relaxation to workaround PR9807, which
+// is useful when running bitwise comparison experiments on Darwin. We should be
+// able to remove this once PR9807 is resolved.
+static cl::opt<bool>
+MCDisableArithRelaxation("mc-x86-disable-arith-relaxation",
+ cl::desc("Disable relaxation of arithmetic instruction for X86"));
+
static unsigned getFixupKindLog2Size(unsigned Kind) {
switch (Kind) {
default: assert(0 && "invalid fixup kind!");
if (getRelaxedOpcodeBranch(Inst.getOpcode()) != Inst.getOpcode())
return true;
+ if (MCDisableArithRelaxation)
+ return false;
+
// Check if this instruction is ever relaxable.
if (getRelaxedOpcodeArith(Inst.getOpcode()) == Inst.getOpcode())
return false;