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Implement a simple FIXME: if we are emitting a basic block address that has

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already been emitted, we don't have to remember it and deal with it later,
just emit it directly.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17868 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-11-16 04:30:51 +00:00
parent 16fe6f5f24
commit f2d552eca6
1 changed files with 13 additions and 3 deletions
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12
lib/Target/X86/X86CodeEmitter.cpp
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@ -278,10 +278,20 @@ void Emitter::emitBasicBlock(const MachineBasicBlock &MBB) {
/// necessary to resolve this address later (and emits a dummy value). /// necessary to resolve this address later (and emits a dummy value).
/// ///
void Emitter::emitPCRelativeBlockAddress(const MachineBasicBlock *MBB) { void Emitter::emitPCRelativeBlockAddress(const MachineBasicBlock *MBB) {
// FIXME: Emit backward branches directly // If this is a backwards branch, we already know the address of the target,
// so just emit the value.
std::map<const MachineBasicBlock*, unsigned>::iterator I =
BasicBlockAddrs.find(MBB);
if (I != BasicBlockAddrs.end()) {
unsigned Location = I->second;
MCE.emitWord(Location-MCE.getCurrentPCValue()-4);
} else {
// Otherwise, remember where this reference was and where it is to so we can
// deal with it later.
BBRefs.push_back(std::make_pair(MBB, MCE.getCurrentPCValue())); BBRefs.push_back(std::make_pair(MBB, MCE.getCurrentPCValue()));
MCE.emitWord(0); MCE.emitWord(0);
} }
}
/// emitPCRelativeValue - Emit a 32-bit PC relative address. /// emitPCRelativeValue - Emit a 32-bit PC relative address.
/// ///