6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-11-01 15:11:24 +00:00
Code Issues Projects Releases Wiki Activity

Handle DEBUG_VALUE in this pass.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99573 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2010-03-26 00:02:44 +00:00
parent 7ec7a0e96b
commit 1feeadac1b
1 changed files with 14 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
lib/CodeGen/OptimizeExts.cpp
View File

@ -73,6 +73,9 @@ FunctionPass *llvm::createOptimizeExtsPass() { return new OptimizeExts(); }
/// the source, and if the source value is preserved as a sub-register of
/// the result, then replace all reachable uses of the source with the subreg
/// of the result.
/// Do not generate an EXTRACT that is used only in a debug use, as this
/// changes the code. Since this code does not currently share EXTRACTs, just
/// ignore all debug uses.
bool OptimizeExts::OptimizeInstr(MachineInstr *MI, MachineBasicBlock *MBB,
SmallPtrSet<MachineInstr*, 8> &LocalMIs) {
bool Changed = false;
@ -84,17 +87,17 @@ bool OptimizeExts::OptimizeInstr(MachineInstr *MI, MachineBasicBlock *MBB,
TargetRegisterInfo::isPhysicalRegister(SrcReg))
return false;
MachineRegisterInfo::use_iterator UI = MRI->use_begin(SrcReg);
if (++UI == MRI->use_end())
MachineRegisterInfo::use_nodbg_iterator UI = MRI->use_nodbg_begin(SrcReg);
if (++UI == MRI->use_nodbg_end())
// No other uses.
return false;
// Ok, the source has other uses. See if we can replace the other uses
// with use of the result of the extension.
SmallPtrSet<MachineBasicBlock*, 4> ReachedBBs;
UI = MRI->use_begin(DstReg);
for (MachineRegisterInfo::use_iterator UE = MRI->use_end(); UI != UE;
++UI)
UI = MRI->use_nodbg_begin(DstReg);
for (MachineRegisterInfo::use_nodbg_iterator UE = MRI->use_nodbg_end();
UI != UE; ++UI)
ReachedBBs.insert(UI->getParent());
bool ExtendLife = true;
@ -103,9 +106,9 @@ bool OptimizeExts::OptimizeInstr(MachineInstr *MI, MachineBasicBlock *MBB,
// Uses that the result of the instruction can reach.
SmallVector<MachineOperand*, 8> ExtendedUses;
UI = MRI->use_begin(SrcReg);
for (MachineRegisterInfo::use_iterator UE = MRI->use_end(); UI != UE;
++UI) {
UI = MRI->use_nodbg_begin(SrcReg);
for (MachineRegisterInfo::use_nodbg_iterator UE = MRI->use_nodbg_end();
UI != UE; ++UI) {
MachineOperand &UseMO = UI.getOperand();
MachineInstr *UseMI = &*UI;
if (UseMI == MI)
@ -147,9 +150,9 @@ bool OptimizeExts::OptimizeInstr(MachineInstr *MI, MachineBasicBlock *MBB,
// Look for PHI uses of the extended result, we don't want to extend the
// liveness of a PHI input. It breaks all kinds of assumptions down
// stream. A PHI use is expected to be the kill of its source values.
UI = MRI->use_begin(DstReg);
for (MachineRegisterInfo::use_iterator UE = MRI->use_end(); UI != UE;
++UI)
UI = MRI->use_nodbg_begin(DstReg);
for (MachineRegisterInfo::use_nodbg_iterator UE = MRI->use_nodbg_end();
UI != UE; ++UI)
if (UI->isPHI())
PHIBBs.insert(UI->getParent());