#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;
TargetAsmBackend *llvm::createX86_32AsmBackend(const Target &T,
const std::string &TT) {
- switch (Triple(TT).getOS()) {
- case Triple::Darwin:
+ Triple TheTriple(TT);
+
+ if (TheTriple.isOSDarwin() || TheTriple.getEnvironment() == Triple::MachO)
return new DarwinX86_32AsmBackend(T);
- case Triple::MinGW32:
- case Triple::Cygwin:
- case Triple::Win32:
- if (Triple(TT).getEnvironment() == Triple::MachO)
- return new DarwinX86_32AsmBackend(T);
- else
- return new WindowsX86AsmBackend(T, false);
- default:
- return new ELFX86_32AsmBackend(T, Triple(TT).getOS());
- }
+
+ if (TheTriple.isOSWindows())
+ return new WindowsX86AsmBackend(T, false);
+
+ return new ELFX86_32AsmBackend(T, TheTriple.getOS());
}
TargetAsmBackend *llvm::createX86_64AsmBackend(const Target &T,
const std::string &TT) {
- switch (Triple(TT).getOS()) {
- case Triple::Darwin:
+ Triple TheTriple(TT);
+
+ if (TheTriple.isOSDarwin() || TheTriple.getEnvironment() == Triple::MachO)
return new DarwinX86_64AsmBackend(T);
- case Triple::MinGW32:
- case Triple::Cygwin:
- case Triple::Win32:
- if (Triple(TT).getEnvironment() == Triple::MachO)
- return new DarwinX86_64AsmBackend(T);
- else
- return new WindowsX86AsmBackend(T, true);
- default:
- return new ELFX86_64AsmBackend(T, Triple(TT).getOS());
- }
+
+ if (TheTriple.isOSWindows())
+ return new WindowsX86AsmBackend(T, true);
+
+ return new ELFX86_64AsmBackend(T, TheTriple.getOS());
}