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Support changing the subtarget features in ARM.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175315 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2013-02-15 22:41:25 +00:00
parent 789cb5df9c
commit 4788d14b48
2 changed files with 29 additions and 4 deletions
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29
lib/Target/ARM/ARMSubtarget.cpp
View File

@ -14,7 +14,9 @@
#include "ARMSubtarget.h"
#include "ARMBaseInstrInfo.h"
#include "ARMBaseRegisterInfo.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Target/TargetInstrInfo.h"
@ -85,17 +87,35 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &CPU,
, CPUString(CPU)
, TargetTriple(TT)
, TargetABI(ARM_ABI_APCS) {
// Determine default and user specified characteristics
resetSubtargetFeatures(CPU, FS);
}
void ARMSubtarget::resetSubtargetFeatures(const MachineFunction *MF) {
AttributeSet FnAttrs = MF->getFunction()->getAttributes();
Attribute CPUAttr = FnAttrs.getAttribute(AttributeSet::FunctionIndex,
"target-cpu");
Attribute FSAttr = FnAttrs.getAttribute(AttributeSet::FunctionIndex,
"target-features");
std::string CPU =
!CPUAttr.hasAttribute(Attribute::None) ?CPUAttr.getValueAsString() : "";
std::string FS =
!FSAttr.hasAttribute(Attribute::None) ? FSAttr.getValueAsString() : "";
if (!FS.empty())
resetSubtargetFeatures(CPU, FS);
}
void ARMSubtarget::resetSubtargetFeatures(StringRef CPU, StringRef FS) {
if (CPUString.empty())
CPUString = "generic";
// Insert the architecture feature derived from the target triple into the
// feature string. This is important for setting features that are implied
// based on the architecture version.
std::string ArchFS = ARM_MC::ParseARMTriple(TT, CPUString);
std::string ArchFS = ARM_MC::ParseARMTriple(TargetTriple.getTriple(),
CPUString);
if (!FS.empty()) {
if (!ArchFS.empty())
ArchFS = ArchFS + "," + FS;
ArchFS = ArchFS + "," + FS.str();
else
ArchFS = FS;
}
@ -112,7 +132,8 @@ ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &CPU,
// Initialize scheduling itinerary for the specified CPU.
InstrItins = getInstrItineraryForCPU(CPUString);
if ((TT.find("eabi") != std::string::npos) || (isTargetIOS() && isMClass()))
if ((TargetTriple.getTriple().find("eabi") != std::string::npos) ||
(isTargetIOS() && isMClass()))
// FIXME: We might want to separate AAPCS and EABI. Some systems, e.g.
// Darwin-EABI conforms to AACPS but not the rest of EABI.
TargetABI = ARM_ABI_AAPCS;

4
lib/Target/ARM/ARMSubtarget.h
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@ -202,6 +202,10 @@ protected:
/// subtarget options. Definition of function is auto generated by tblgen.
void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
/// \brief Reset the features for the X86 target.
virtual void resetSubtargetFeatures(const MachineFunction *MF);
void resetSubtargetFeatures(StringRef CPU, StringRef FS);
void computeIssueWidth();
bool hasV4TOps() const { return HasV4TOps; }