//
//===----------------------------------------------------------------------===//
-#ifndef X86CALLINGCONV_H
-#define X86CALLINGCONV_H
+#ifndef LLVM_LIB_TARGET_X86_X86CALLINGCONV_H
+#define LLVM_LIB_TARGET_X86_X86CALLINGCONV_H
+#include "MCTargetDesc/X86MCTargetDesc.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/IR/CallingConv.h"
namespace llvm {
+inline bool CC_X86_32_VectorCallIndirect(unsigned &ValNo, MVT &ValVT,
+ MVT &LocVT,
+ CCValAssign::LocInfo &LocInfo,
+ ISD::ArgFlagsTy &ArgFlags,
+ CCState &State) {
+ // Similar to CCPassIndirect, with the addition of inreg.
+ LocVT = MVT::i32;
+ LocInfo = CCValAssign::Indirect;
+ ArgFlags.setInReg();
+ return false; // Continue the search, but now for i32.
+}
+
+
inline bool CC_X86_AnyReg_Error(unsigned &, MVT &, MVT &,
CCValAssign::LocInfo &, ISD::ArgFlagsTy &,
CCState &) {
return false;
}
-inline bool CC_X86_CDeclMethod_SRet(unsigned &ValNo, MVT &ValVT, MVT &LocVT,
- CCValAssign::LocInfo &LocInfo,
- ISD::ArgFlagsTy &ArgFlags, CCState &State) {
- // Swap the order of the first two parameters if the first parameter is sret.
- if (ArgFlags.isSRet()) {
- assert(ValNo == 0);
- assert(ValVT == MVT::i32);
- State.AllocateStack(8, 4);
- State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT, 4, LocVT, LocInfo));
-
- // Indicate that we need to swap the order of the first and second
- // parameters by "allocating" register zero. There are no register
- // parameters with cdecl methods, so we can use this to communicate to the
- // next call.
- State.AllocateReg(1);
- return true;
- } else if (ValNo == 1 && State.isAllocated(1)) {
- assert(ValVT == MVT::i32 && "non-i32-sized this param unsupported");
- // Stack was already allocated while processing sret.
- State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT, 0, LocVT, LocInfo));
- return true;
+inline bool CC_X86_32_MCUInReg(unsigned &ValNo, MVT &ValVT,
+ MVT &LocVT,
+ CCValAssign::LocInfo &LocInfo,
+ ISD::ArgFlagsTy &ArgFlags,
+ CCState &State) {
+ // This is similar to CCAssignToReg<[EAX, EDX, ECX]>, but makes sure
+ // not to split i64 and double between a register and stack
+ static const MCPhysReg RegList[] = {X86::EAX, X86::EDX, X86::ECX};
+ static const unsigned NumRegs = sizeof(RegList)/sizeof(RegList[0]);
+
+ SmallVectorImpl<CCValAssign> &PendingMembers = State.getPendingLocs();
+
+ // If this is the first part of an double/i64/i128, or if we're already
+ // in the middle of a split, add to the pending list. If this is not
+ // the end of the split, return, otherwise go on to process the pending
+ // list
+ if (ArgFlags.isSplit() || !PendingMembers.empty()) {
+ PendingMembers.push_back(
+ CCValAssign::getPending(ValNo, ValVT, LocVT, LocInfo));
+ if (!ArgFlags.isSplitEnd())
+ return true;
}
- // All other args use the C calling convention.
- return false;
+ // If there are no pending members, we are not in the middle of a split,
+ // so do the usual inreg stuff.
+ if (PendingMembers.empty()) {
+ if (unsigned Reg = State.AllocateReg(RegList)) {
+ State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
+ return true;
+ }
+ return false;
+ }
+
+ assert(ArgFlags.isSplitEnd());
+
+ // We now have the entire original argument in PendingMembers, so decide
+ // whether to use registers or the stack.
+ // Per the MCU ABI:
+ // a) To use registers, we need to have enough of them free to contain
+ // the entire argument.
+ // b) We never want to use more than 2 registers for a single argument.
+
+ unsigned FirstFree = State.getFirstUnallocated(RegList);
+ bool UseRegs = PendingMembers.size() <= std::min(2U, NumRegs - FirstFree);
+
+ for (auto &It : PendingMembers) {
+ if (UseRegs)
+ It.convertToReg(State.AllocateReg(RegList[FirstFree++]));
+ else
+ It.convertToMem(State.AllocateStack(4, 4));
+ State.addLoc(It);
+ }
+
+ PendingMembers.clear();
+
+ return true;
}
} // End llvm namespace