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switch RegsForValue::Regs to be a SmallVector to avoid 

heap thrash on tiny (usually single-element) vectors.

llvm-svn: 50335
This commit is contained in:
Chris Lattner 2008-04-28 06:02:19 +00:00
parent 84836144d9
commit 8c7f5ad968
1 changed files with 4 additions and 4 deletions
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8
llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -125,7 +125,7 @@ namespace {
/// Regs - This list holds the register (for legal and promoted values)
/// or register set (for expanded values) that the value should be assigned
/// to.
std::vector<unsigned> Regs;
SmallVector<unsigned, 4> Regs;
/// RegVTs - The value types of the registers. This is the same size
/// as ValueVTs; every register contributing to a given value must
@ -146,11 +146,11 @@ namespace {
unsigned Reg, MVT::ValueType regvt, MVT::ValueType valuevt)
: TLI(&tli), Regs(1, Reg), RegVTs(1, regvt), ValueVTs(1, valuevt) {}
RegsForValue(const TargetLowering &tli,
const std::vector<unsigned> &regs,
const SmallVectorImpl<unsigned> &regs,
MVT::ValueType regvt, MVT::ValueType valuevt)
: TLI(&tli), Regs(regs), RegVTs(1, regvt), ValueVTs(1, valuevt) {}
RegsForValue(const TargetLowering &tli,
const std::vector<unsigned> &regs,
const SmallVectorImpl<unsigned> &regs,
const SmallVector<MVT::ValueType, 4> &regvts,
const SmallVector<MVT::ValueType, 4> &valuevts)
: TLI(&tli), Regs(regs), RegVTs(regvts), ValueVTs(valuevts) {}
@ -3600,7 +3600,7 @@ GetRegistersForValue(SDISelAsmOperandInfo &OpInfo, bool HasEarlyClobber,
MachineFunction &MF = DAG.getMachineFunction();
std::vector<unsigned> Regs;
SmallVector<unsigned, 8> Regs;
// If this is a constraint for a single physreg, or a constraint for a
// register class, find it.