Changes in directory llvm/include/llvm/CodeGen:
LiveInterval.h updated: 1.18 -> 1.19
---
Log message:
Improve the LiveInterval class to keep track of which machine instruction
defines each value# tracked by the interval. This will be used to improve
coallescing.
---
Diffs of the changes: (+23 -2)
LiveInterval.h | 25 +++++++++++++++++++++++--
1 files changed, 23 insertions(+), 2 deletions(-)
Index: llvm/include/llvm/CodeGen/LiveInterval.h
diff -u llvm/include/llvm/CodeGen/LiveInterval.h:1.18
llvm/include/llvm/CodeGen/LiveInterval.h:1.19
--- llvm/include/llvm/CodeGen/LiveInterval.h:1.18 Tue Aug 22 01:32:56 2006
+++ llvm/include/llvm/CodeGen/LiveInterval.h Tue Aug 22 13:19:46 2006
@@ -79,6 +79,11 @@
Ranges ranges; // the ranges in which this register is live
private:
unsigned NumValues; // the number of distinct values in this interval.
+
+ /// InstDefiningValue - This tracks the def index of the instruction that
+ /// defines a particular value number in the interval. This may be ~0,
+ /// which is treated as unknown.
+ SmallVector<unsigned, 4> InstDefiningValue;
public:
LiveInterval(unsigned Reg, float Weight)
@@ -109,15 +114,31 @@
void swap(LiveInterval& other) {
std::swap(reg, other.reg);
std::swap(weight, other.weight);
- ranges.swap(other.ranges);
+ std::swap(ranges, other.ranges);
std::swap(NumValues, other.NumValues);
}
bool containsOneValue() const { return NumValues == 1; }
- unsigned getNextValue() {
+ /// getNextValue - Create a new value number and return it. MIIdx
specifies
+ /// the instruction that defines the value number.
+ unsigned getNextValue(unsigned MIIdx) {
+ InstDefiningValue.push_back(MIIdx);
return NumValues++;
}
+
+ /// getInstForValNum - Return the machine instruction index that defines
the
+ /// specified value number.
+ unsigned getInstForValNum(unsigned ValNo) const {
+ return InstDefiningValue[ValNo];
+ }
+
+ /// setInstDefiningValNum - Change the instruction defining the specified
+ /// value number to the specified instruction.
+ void setInstDefiningValNum(unsigned ValNo, unsigned MIIdx) {
+ InstDefiningValue[ValNo] = MIIdx;
+ }
+
bool empty() const { return ranges.empty(); }
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