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[PowerPC] Add a flag for experimenting with subreg liveness tracking

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This cannot yet be enabled by default, it causes ~50 miscompiles in the test
suite.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225497 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2015-01-09 02:03:11 +00:00
parent 4e98296890
commit cc7ea4df1e
2 changed files with 10 additions and 0 deletions
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8
lib/Target/PowerPC/PPCSubtarget.cpp
View File

@ -19,6 +19,7 @@
#include "llvm/IR/Attributes.h" #include "llvm/IR/Attributes.h"
#include "llvm/IR/Function.h" #include "llvm/IR/Function.h"
#include "llvm/IR/GlobalValue.h" #include "llvm/IR/GlobalValue.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Host.h" #include "llvm/Support/Host.h"
#include "llvm/Support/TargetRegistry.h" #include "llvm/Support/TargetRegistry.h"
#include "llvm/Target/TargetMachine.h" #include "llvm/Target/TargetMachine.h"
@ -32,6 +33,9 @@ using namespace llvm;
#define GET_SUBTARGETINFO_CTOR #define GET_SUBTARGETINFO_CTOR
#include "PPCGenSubtargetInfo.inc" #include "PPCGenSubtargetInfo.inc"
static cl::opt<bool> UseSubRegLiveness("ppc-track-subreg-liveness",
cl::desc("Enable subregister liveness tracking for PPC"), cl::Hidden);
/// Return the datalayout string of a subtarget. /// Return the datalayout string of a subtarget.
static std::string getDataLayoutString(const Triple &T) { static std::string getDataLayoutString(const Triple &T) {
bool is64Bit = T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le; bool is64Bit = T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le;
@ -234,3 +238,7 @@ bool PPCSubtarget::useAA() const {
return needsAggressiveScheduling(DarwinDirective); return needsAggressiveScheduling(DarwinDirective);
} }
bool PPCSubtarget::enableSubRegLiveness() const {
return UseSubRegLiveness;
}

2
lib/Target/PowerPC/PPCSubtarget.h
View File

@ -259,6 +259,8 @@ public:
MachineInstr *end, MachineInstr *end,
unsigned NumRegionInstrs) const override; unsigned NumRegionInstrs) const override;
bool useAA() const override; bool useAA() const override;
bool enableSubRegLiveness() const override;
}; };
} // End llvm namespace } // End llvm namespace