static const MCPhysReg RegList[] = { ARM::R0, ARM::R1, ARM::R2, ARM::R3 };
// Try to get the first register.
- if (unsigned Reg = State.AllocateReg(RegList, 4))
+ if (unsigned Reg = State.AllocateReg(RegList))
State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo));
else {
// For the 2nd half of a v2f64, do not fail.
}
// Try to get the second register.
- if (unsigned Reg = State.AllocateReg(RegList, 4))
+ if (unsigned Reg = State.AllocateReg(RegList))
State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo));
else
State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT,
static const MCPhysReg ShadowRegList[] = { ARM::R0, ARM::R1 };
static const MCPhysReg GPRArgRegs[] = { ARM::R0, ARM::R1, ARM::R2, ARM::R3 };
- unsigned Reg = State.AllocateReg(HiRegList, ShadowRegList, 2);
+ unsigned Reg = State.AllocateReg(HiRegList, ShadowRegList);
if (Reg == 0) {
// If we had R3 unallocated only, now we still must to waste it.
- Reg = State.AllocateReg(GPRArgRegs, 4);
+ Reg = State.AllocateReg(GPRArgRegs);
assert((!Reg || Reg == ARM::R3) && "Wrong GPRs usage for f64");
// For the 2nd half of a v2f64, do not just fail.
static const MCPhysReg HiRegList[] = { ARM::R0, ARM::R2 };
static const MCPhysReg LoRegList[] = { ARM::R1, ARM::R3 };
- unsigned Reg = State.AllocateReg(HiRegList, LoRegList, 2);
+ unsigned Reg = State.AllocateReg(HiRegList, LoRegList);
if (Reg == 0)
return false; // we didn't handle it
State);
}
+static const uint16_t RRegList[] = { ARM::R0, ARM::R1, ARM::R2, ARM::R3 };
+
static const uint16_t SRegList[] = { ARM::S0, ARM::S1, ARM::S2, ARM::S3,
ARM::S4, ARM::S5, ARM::S6, ARM::S7,
ARM::S8, ARM::S9, ARM::S10, ARM::S11,
ARM::D4, ARM::D5, ARM::D6, ARM::D7 };
static const uint16_t QRegList[] = { ARM::Q0, ARM::Q1, ARM::Q2, ARM::Q3 };
+
// Allocate part of an AAPCS HFA or HVA. We assume that each member of the HA
// has InConsecutiveRegs set, and that the last member also has
// InConsecutiveRegsLast set. We must process all members of the HA before
// we can allocate it, as we need to know the total number of registers that
// will be needed in order to (attempt to) allocate a contiguous block.
-static bool CC_ARM_AAPCS_Custom_HA(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
- CCValAssign::LocInfo &LocInfo,
- ISD::ArgFlagsTy &ArgFlags, CCState &State) {
- SmallVectorImpl<CCValAssign> &PendingHAMembers = State.getPendingLocs();
+static bool CC_ARM_AAPCS_Custom_Aggregate(unsigned &ValNo, MVT &ValVT,
+ MVT &LocVT,
+ CCValAssign::LocInfo &LocInfo,
+ ISD::ArgFlagsTy &ArgFlags,
+ CCState &State) {
+ SmallVectorImpl<CCValAssign> &PendingMembers = State.getPendingLocs();
+
// AAPCS HFAs must have 1-4 elements, all of the same type
- assert(PendingHAMembers.size() < 8);
- if (PendingHAMembers.size() > 0)
- assert(PendingHAMembers[0].getLocVT() == LocVT);
+ if (PendingMembers.size() > 0)
+ assert(PendingMembers[0].getLocVT() == LocVT);
// Add the argument to the list to be allocated once we know the size of the
- // HA
- PendingHAMembers.push_back(
- CCValAssign::getPending(ValNo, ValVT, LocVT, LocInfo));
-
- if (ArgFlags.isInConsecutiveRegsLast()) {
- assert(PendingHAMembers.size() > 0 && PendingHAMembers.size() <= 8 &&
- "Homogeneous aggregates must have between 1 and 4 members");
-
- // Try to allocate a contiguous block of registers, each of the correct
- // size to hold one member.
- const uint16_t *RegList;
- unsigned NumRegs;
- switch (LocVT.SimpleTy) {
- case MVT::i32:
- case MVT::f32:
- RegList = SRegList;
- NumRegs = 16;
- break;
- case MVT::f64:
- RegList = DRegList;
- NumRegs = 8;
- break;
- case MVT::v2f64:
- RegList = QRegList;
- NumRegs = 4;
- break;
- default:
- llvm_unreachable("Unexpected member type for HA");
- break;
- }
+ // aggregate. Store the type's required alignmnent as extra info for later: in
+ // the [N x i64] case all trace has been removed by the time we actually get
+ // to do allocation.
+ PendingMembers.push_back(CCValAssign::getPending(ValNo, ValVT, LocVT, LocInfo,
+ ArgFlags.getOrigAlign()));
- unsigned RegResult =
- State.AllocateRegBlock(RegList, NumRegs, PendingHAMembers.size());
-
- if (RegResult) {
- for (SmallVectorImpl<CCValAssign>::iterator It = PendingHAMembers.begin();
- It != PendingHAMembers.end(); ++It) {
- It->convertToReg(RegResult);
- State.addLoc(*It);
- ++RegResult;
- }
- PendingHAMembers.clear();
- return true;
- }
+ if (!ArgFlags.isInConsecutiveRegsLast())
+ return true;
- // Register allocation failed, fall back to the stack
+ // Try to allocate a contiguous block of registers, each of the correct
+ // size to hold one member.
+ unsigned Align = std::min(PendingMembers[0].getExtraInfo(), 8U);
- // Mark all VFP regs as unavailable (AAPCS rule C.2.vfp)
- for (unsigned regNo = 0; regNo < 16; ++regNo)
- State.AllocateReg(SRegList[regNo]);
+ ArrayRef<uint16_t> RegList;
+ switch (LocVT.SimpleTy) {
+ case MVT::i32: {
+ RegList = RRegList;
+ unsigned RegIdx = State.getFirstUnallocated(RegList);
- unsigned Size = LocVT.getSizeInBits() / 8;
- unsigned Align = Size;
+ // First consume all registers that would give an unaligned object. Whether
+ // we go on stack or in regs, no-one will be using them in future.
+ unsigned RegAlign = RoundUpToAlignment(Align, 4) / 4;
+ while (RegIdx % RegAlign != 0 && RegIdx < RegList.size())
+ State.AllocateReg(RegList[RegIdx++]);
- if (LocVT.SimpleTy == MVT::v2f64 || LocVT.SimpleTy == MVT::i32) {
- // Vectors are always aligned to 8 bytes. If we've seen an i32 here
- // it's because it's been split from a larger type, also with align 8.
- Align = 8;
+ break;
+ }
+ case MVT::f32:
+ RegList = SRegList;
+ break;
+ case MVT::f64:
+ RegList = DRegList;
+ break;
+ case MVT::v2f64:
+ RegList = QRegList;
+ break;
+ default:
+ llvm_unreachable("Unexpected member type for block aggregate");
+ break;
+ }
+
+ unsigned RegResult = State.AllocateRegBlock(RegList, PendingMembers.size());
+ if (RegResult) {
+ for (SmallVectorImpl<CCValAssign>::iterator It = PendingMembers.begin();
+ It != PendingMembers.end(); ++It) {
+ It->convertToReg(RegResult);
+ State.addLoc(*It);
+ ++RegResult;
}
+ PendingMembers.clear();
+ return true;
+ }
- for (auto It : PendingHAMembers) {
- It.convertToMem(State.AllocateStack(Size, Align));
- State.addLoc(It);
+ // Register allocation failed, we'll be needing the stack
+ unsigned Size = LocVT.getSizeInBits() / 8;
+ if (LocVT == MVT::i32 && State.getNextStackOffset() == 0) {
+ // If nothing else has used the stack until this point, a non-HFA aggregate
+ // can be split between regs and stack.
+ unsigned RegIdx = State.getFirstUnallocated(RegList);
+ for (auto &It : PendingMembers) {
+ if (RegIdx >= RegList.size())
+ It.convertToMem(State.AllocateStack(Size, Size));
+ else
+ It.convertToReg(State.AllocateReg(RegList[RegIdx++]));
- // Only the first member needs to be aligned.
- Align = 1;
+ State.addLoc(It);
}
+ PendingMembers.clear();
+ return true;
+ } else if (LocVT != MVT::i32)
+ RegList = SRegList;
+
+ // Mark all regs as unavailable (AAPCS rule C.2.vfp for VFP, C.6 for core)
+ for (auto Reg : RegList)
+ State.AllocateReg(Reg);
- // All pending members have now been allocated
- PendingHAMembers.clear();
+ for (auto &It : PendingMembers) {
+ It.convertToMem(State.AllocateStack(Size, Align));
+ State.addLoc(It);
+
+ // After the first item has been allocated, the rest are packed as tightly
+ // as possible. (E.g. an incoming i64 would have starting Align of 8, but
+ // we'll be allocating a bunch of i32 slots).
+ Align = Size;
}
- // This will be allocated by the last member of the HA
+ // All pending members have now been allocated
+ PendingMembers.clear();
+
+ // This will be allocated by the last member of the aggregate
return true;
}
projects / oota-llvm.git / blobdiff