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Testing convertToThreeeAddress as X86 llcbeta.

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llvm-svn: 42630
This commit is contained in:
Evan Cheng 2007-10-05 08:04:01 +00:00
parent 7cb8b28613
commit 4e46ad06fe
1 changed files with 24 additions and 5 deletions
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29
lib/Target/X86/X86InstrInfo.cpp
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@ -22,8 +22,15 @@
#include "llvm/CodeGen/LiveVariables.h"
#include "llvm/CodeGen/SSARegMap.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;
namespace {
cl::opt<bool>
EnableConvert3Addr("enable-x86-conv-3-addr",
cl::desc("Enable convertToThreeAddress for X86"));
}
X86InstrInfo::X86InstrInfo(X86TargetMachine &tm)
: TargetInstrInfo(X86Insts, array_lengthof(X86Insts)),
TM(tm), RI(tm, *this) {
@ -144,6 +151,21 @@ bool X86InstrInfo::isReallyTriviallyReMaterializable(MachineInstr *MI) const {
return true;
}
/// hasLiveCondCodeDef - True if MI has a condition code def, e.g. EFLAGS, that
/// is not marked dead.
static bool hasLiveCondCodeDef(MachineInstr *MI) {
if (!EnableConvert3Addr)
return true;
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
MachineOperand &MO = MI->getOperand(i);
if (MO.isRegister() && MO.isDef() &&
MO.getReg() == X86::EFLAGS && !MO.isDead()) {
return true;
}
}
return false;
}
/// convertToThreeAddress - This method must be implemented by targets that
/// set the M_CONVERTIBLE_TO_3_ADDR flag. When this flag is set, the target
/// may be able to convert a two-address instruction into a true
@ -169,7 +191,7 @@ X86InstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
bool DisableLEA16 = true;
switch (MI->getOpcode()) {
default: return 0;
default: break; // All others need to check for live condition code defs.
case X86::SHUFPSrri: {
assert(MI->getNumOperands() == 4 && "Unknown shufps instruction!");
if (!TM.getSubtarget<X86Subtarget>().hasSSE2()) return 0;
@ -253,10 +275,7 @@ X86InstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
}
}
// FIXME: None of these instructions are promotable to LEAs without
// additional information. In particular, LEA doesn't set the flags that
// add and inc do. :(
if (0)
if (!hasLiveCondCodeDef(MI))
switch (MI->getOpcode()) {
case X86::INC32r:
case X86::INC64_32r: