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Add comment, fix typo, reduce memory usage, etc.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33510 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-01-25 23:18:59 +00:00
parent 3df62bde9b
commit c285414988
1 changed files with 14 additions and 9 deletions
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23
lib/Target/ARM/ARMConstantIslandPass.cpp
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@ -79,14 +79,14 @@ namespace {
/// opcode.
struct ImmBranch {
MachineInstr *MI;
bool isCond;
unsigned MaxDisp : 31;
bool isCond : 1;
int UncondBr;
unsigned MaxDisp;
ImmBranch(MachineInstr *mi, bool cond, int ubr, unsigned maxdisp)
: MI(mi), isCond(cond), UncondBr(ubr), MaxDisp(maxdisp) {}
ImmBranch(MachineInstr *mi, unsigned maxdisp, bool cond, int ubr)
: MI(mi), MaxDisp(maxdisp), isCond(cond), UncondBr(ubr) {}
};
/// Branches - Keep track of all the immediate branche instructions.
/// Branches - Keep track of all the immediate branch instructions.
///
std::vector<ImmBranch> ImmBranches;
@ -107,7 +107,7 @@ namespace {
void SplitBlockBeforeInstr(MachineInstr *MI);
void UpdateForInsertedWaterBlock(MachineBasicBlock *NewBB);
bool HandleConstantPoolUser(MachineFunction &Fn, CPUser &U);
bool ShortenImmediateBranch(MachineFunction &Fn, ImmBranch &Br);
bool FixUpImmediateBranch(MachineFunction &Fn, ImmBranch &Br);
unsigned GetInstSize(MachineInstr *MI) const;
unsigned GetOffsetOf(MachineInstr *MI) const;
@ -154,7 +154,7 @@ bool ARMConstantIslands::runOnMachineFunction(MachineFunction &Fn) {
for (unsigned i = 0, e = CPUsers.size(); i != e; ++i)
MadeChange |= HandleConstantPoolUser(Fn, CPUsers[i]);
for (unsigned i = 0, e = ImmBranches.size(); i != e; ++i)
MadeChange |= ShortenImmediateBranch(Fn, ImmBranches[i]);
MadeChange |= FixUpImmediateBranch(Fn, ImmBranches[i]);
} while (MadeChange);
BBSizes.clear();
@ -260,7 +260,7 @@ void ARMConstantIslands::InitialFunctionScan(MachineFunction &Fn,
break;
}
unsigned MaxDisp = (1 << (Bits-1)) * Scale;
ImmBranches.push_back(ImmBranch(I, isCond, UOpc, MaxDisp));
ImmBranches.push_back(ImmBranch(I, MaxDisp, isCond, UOpc));
}
// Scan the instructions for constant pool operands.
@ -560,8 +560,13 @@ bool ARMConstantIslands::HandleConstantPoolUser(MachineFunction &Fn, CPUser &U){
return true;
}
/// FixUpImmediateBranch - Fix up immediate branches whose destination is too
/// far away to fit in its displacement field. If it is a conditional branch,
/// then it is converted to an inverse conditional branch + an unconditional
/// branch to the destination. If it is an unconditional branch, then it is
/// converted to a branch to a branch.
bool
ARMConstantIslands::ShortenImmediateBranch(MachineFunction &Fn, ImmBranch &Br) {
ARMConstantIslands::FixUpImmediateBranch(MachineFunction &Fn, ImmBranch &Br) {
MachineInstr *MI = Br.MI;
MachineBasicBlock *DestBB = MI->getOperand(0).getMachineBasicBlock();