6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-08-09 11:25:55 +00:00
Code Issues Projects Releases Wiki Activity

Downwards growing stack allocation order reverses relative offsets

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111673 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach
2010-08-20 20:25:31 +00:00
parent ab6bdec837
commit 4c207c2ddb
1 changed files with 10 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
lib/CodeGen/LocalStackSlotAllocation.cpp
View File

@@ -174,6 +174,7 @@ static inline bool
lookupCandidateBaseReg(const SmallVector<std::pair<unsigned, int64_t>, 8> &Regs, lookupCandidateBaseReg(const SmallVector<std::pair<unsigned, int64_t>, 8> &Regs,
std::pair<unsigned, int64_t> &RegOffset, std::pair<unsigned, int64_t> &RegOffset,
int64_t LocalFrameOffset, int64_t LocalFrameOffset,
bool StackGrowsDown,
const MachineInstr *MI, const MachineInstr *MI,
const TargetRegisterInfo *TRI) { const TargetRegisterInfo *TRI) {
unsigned e = Regs.size(); unsigned e = Regs.size();
@@ -182,6 +183,8 @@ lookupCandidateBaseReg(const SmallVector<std::pair<unsigned, int64_t>, 8> &Regs,
// Check if the relative offset from the where the base register references // Check if the relative offset from the where the base register references
// to the target address is in range for the instruction. // to the target address is in range for the instruction.
int64_t Offset = LocalFrameOffset - RegOffset.second; int64_t Offset = LocalFrameOffset - RegOffset.second;
if (StackGrowsDown)
Offset = -Offset;
if (TRI->isFrameOffsetLegal(MI, Offset)) if (TRI->isFrameOffsetLegal(MI, Offset))
return true; return true;
} }
@@ -199,6 +202,9 @@ bool LocalStackSlotPass::insertFrameReferenceRegisters(MachineFunction &Fn) {
MachineFrameInfo *MFI = Fn.getFrameInfo(); MachineFrameInfo *MFI = Fn.getFrameInfo();
const TargetRegisterInfo *TRI = Fn.getTarget().getRegisterInfo(); const TargetRegisterInfo *TRI = Fn.getTarget().getRegisterInfo();
const TargetFrameInfo &TFI = *Fn.getTarget().getFrameInfo();
bool StackGrowsDown =
TFI.getStackGrowthDirection() == TargetFrameInfo::StackGrowsDown;
for (MachineFunction::iterator BB = Fn.begin(), for (MachineFunction::iterator BB = Fn.begin(),
E = Fn.end(); BB != E; ++BB) { E = Fn.end(); BB != E; ++BB) {
@@ -245,12 +251,15 @@ bool LocalStackSlotPass::insertFrameReferenceRegisters(MachineFunction &Fn) {
// register. // register.
std::pair<unsigned, int64_t> RegOffset; std::pair<unsigned, int64_t> RegOffset;
if (lookupCandidateBaseReg(BaseRegisters, RegOffset, if (lookupCandidateBaseReg(BaseRegisters, RegOffset,
LocalOffsets[FrameIdx], MI, TRI)) { LocalOffsets[FrameIdx],
StackGrowsDown, MI, TRI)) {
DEBUG(dbgs() << " Reusing base register " << DEBUG(dbgs() << " Reusing base register " <<
RegOffset.first << "\n"); RegOffset.first << "\n");
// We found a register to reuse. // We found a register to reuse.
BaseReg = RegOffset.first; BaseReg = RegOffset.first;
Offset = LocalOffsets[FrameIdx] - RegOffset.second; Offset = LocalOffsets[FrameIdx] - RegOffset.second;
if (StackGrowsDown)
Offset = -Offset;
} else { } else {
// No previously defined register was in range, so create a // No previously defined register was in range, so create a
// new one. // new one.