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misched: When querying RegisterPressureTracker, always save current and max pressure.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158340 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2012-06-11 23:42:23 +00:00
parent 4487479543
commit 0eb3a3524e
2 changed files with 16 additions and 7 deletions
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13
include/llvm/CodeGen/RegisterPressure.h
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@ -249,19 +249,22 @@ public:
/// Get the pressure of each PSet after traversing this instruction bottom-up.
void getUpwardPressure(const MachineInstr *MI,
std::vector<unsigned> &PressureResult);
std::vector<unsigned> &PressureResult,
std::vector<unsigned> &MaxPressureResult);
/// Get the pressure of each PSet after traversing this instruction top-down.
void getDownwardPressure(const MachineInstr *MI,
std::vector<unsigned> &PressureResult);
std::vector<unsigned> &PressureResult,
std::vector<unsigned> &MaxPressureResult);
void getPressureAfterInst(const MachineInstr *MI,
std::vector<unsigned> &PressureResult) {
std::vector<unsigned> &PressureResult,
std::vector<unsigned> &MaxPressureResult) {
if (isTopClosed())
return getUpwardPressure(MI, PressureResult);
return getUpwardPressure(MI, PressureResult, MaxPressureResult);
assert(isBottomClosed() && "Uninitialized pressure tracker");
return getDownwardPressure(MI, PressureResult);
return getDownwardPressure(MI, PressureResult, MaxPressureResult);
}
protected:

10
lib/CodeGen/RegisterPressure.cpp
View File

@ -811,25 +811,31 @@ getMaxDownwardPressureDelta(const MachineInstr *MI, RegPressureDelta &Delta,
/// Get the pressure of each PSet after traversing this instruction bottom-up.
void RegPressureTracker::
getUpwardPressure(const MachineInstr *MI,
std::vector<unsigned> &PressureResult) {
std::vector<unsigned> &PressureResult,
std::vector<unsigned> &MaxPressureResult) {
// Snapshot pressure.
PressureResult = CurrSetPressure;
MaxPressureResult = P.MaxSetPressure;
bumpUpwardPressure(MI);
// Current pressure becomes the result. Restore current pressure.
P.MaxSetPressure.swap(MaxPressureResult);
CurrSetPressure.swap(PressureResult);
}
/// Get the pressure of each PSet after traversing this instruction top-down.
void RegPressureTracker::
getDownwardPressure(const MachineInstr *MI,
std::vector<unsigned> &PressureResult) {
std::vector<unsigned> &PressureResult,
std::vector<unsigned> &MaxPressureResult) {
// Snapshot pressure.
PressureResult = CurrSetPressure;
MaxPressureResult = P.MaxSetPressure;
bumpDownwardPressure(MI);
// Current pressure becomes the result. Restore current pressure.
P.MaxSetPressure.swap(MaxPressureResult);
CurrSetPressure.swap(PressureResult);
}