/// definition and use points.
///
class VNInfo {
- private:
- enum {
- HAS_PHI_KILL = 1,
- IS_PHI_DEF = 1 << 1,
- IS_UNUSED = 1 << 2
- };
-
- unsigned char flags;
-
public:
typedef BumpPtrAllocator Allocator;
/// VNInfo constructor.
VNInfo(unsigned i, SlotIndex d)
- : flags(0), id(i), def(d)
+ : id(i), def(d)
{ }
/// VNInfo construtor, copies values from orig, except for the value number.
VNInfo(unsigned i, const VNInfo &orig)
- : flags(orig.flags), id(i), def(orig.def)
+ : id(i), def(orig.def)
{ }
/// Copy from the parameter into this VNInfo.
void copyFrom(VNInfo &src) {
- flags = src.flags;
def = src.def;
}
- /// Used for copying value number info.
- unsigned getFlags() const { return flags; }
- void setFlags(unsigned flags) { this->flags = flags; }
-
- /// Merge flags from another VNInfo
- void mergeFlags(const VNInfo *VNI) {
- flags = (flags | VNI->flags) & ~IS_UNUSED;
- }
-
- /// Returns true if one or more kills are PHI nodes.
- /// Obsolete, do not use!
- bool hasPHIKill() const { return flags & HAS_PHI_KILL; }
- /// Set the PHI kill flag on this value.
- void setHasPHIKill(bool hasKill) {
- if (hasKill)
- flags |= HAS_PHI_KILL;
- else
- flags &= ~HAS_PHI_KILL;
- }
-
/// Returns true if this value is defined by a PHI instruction (or was,
/// PHI instrucions may have been eliminated).
- bool isPHIDef() const { return flags & IS_PHI_DEF; }
- /// Set the "phi def" flag on this value.
- void setIsPHIDef(bool phiDef) {
- if (phiDef)
- flags |= IS_PHI_DEF;
- else
- flags &= ~IS_PHI_DEF;
- }
+ /// PHI-defs begin at a block boundary, all other defs begin at register or
+ /// EC slots.
+ bool isPHIDef() const { return def.isBlock(); }
/// Returns true if this value is unused.
- bool isUnused() const { return flags & IS_UNUSED; }
- /// Set the "is unused" flag on this value.
- void setIsUnused(bool unused) {
- if (unused)
- flags |= IS_UNUSED;
- else
- flags &= ~IS_UNUSED;
- }
+ bool isUnused() const { return !def.isValid(); }
+
+ /// Mark this value as unused.
+ void markUnused() { def = SlotIndex(); }
};
/// LiveRange structure - This represents a simple register range in the
Ranges::iterator extendIntervalStartTo(Ranges::iterator I, SlotIndex NewStr);
void markValNoForDeletion(VNInfo *V);
void mergeIntervalRanges(const LiveInterval &RHS,
- VNInfo *LHSValNo,
+ VNInfo *LHSValNo = 0,
const VNInfo *RHSValNo = 0);
LiveInterval& operator=(const LiveInterval& rhs); // DO NOT IMPLEMENT