ZeroOrNegativeOneSetCCResult, // SetCC returns a sign extended result.
};
+ enum SchedPreference {
+ SchedulingForLatency, // Scheduling for shortest total latency.
+ SchedulingForRegPressure, // Scheduling for lowest register pressure.
+ };
+
TargetLowering(TargetMachine &TM);
virtual ~TargetLowering();
/// result register.
SetCCResultValue getSetCCResultContents() const { return SetCCResultContents;}
+ /// getSchedulingPreference - Return target scheduling preference.
+ SchedPreference getSchedulingPreference() const {
+ return SchedPreferenceInfo;
+ }
+
/// getRegClassFor - Return the register class that should be used for the
/// specified value type. This may only be called on legal types.
TargetRegisterClass *getRegClassFor(MVT::ValueType VT) const {
/// setcc operation in a register.
void setSetCCResultContents(SetCCResultValue Ty) { SetCCResultContents = Ty; }
+ /// setSchedulingPreference - Specify the target scheduling preference.
+ void setSchedulingPreference(SchedPreference Pref) {
+ SchedPreferenceInfo = Pref;
+ }
+
/// setShiftAmountFlavor - Describe how the target handles out of range shift
/// amounts.
void setShiftAmountFlavor(OutOfRangeShiftAmount OORSA) {
/// SetCCResultContents - Information about the contents of the high-bits in
/// the result of a setcc comparison operation.
SetCCResultValue SetCCResultContents;
+
+ /// SchedPreferenceInfo - The target scheduling preference: shortest possible
+ /// total cycles or lowest register usage.
+ SchedPreference SchedPreferenceInfo;
/// UseUnderscoreSetJmpLongJmp - This target prefers to use _setjmp and
/// _longjmp to implement llvm.setjmp/llvm.longjmp. Defaults to false.