Skip to content

[llvm] X86_64 CC for UEFI #137905

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 3 commits into from
May 2, 2025
Merged

[llvm] X86_64 CC for UEFI #137905

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
d9e4c7f
[llvm] X86_64 CC for UEFI
Prabhuk Apr 29, 2025
94a74e7
Remove isTargetWinOrUEFI64
Prabhuk May 1, 2025
1e14acc
Fix formatting
Prabhuk May 1, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
12 changes: 10 additions & 2 deletions llvm/lib/Target/X86/X86CallingConv.td
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -283,8 +283,10 @@ def RetCC_X86Common : CallingConv<[
CCAssignToReg<[ZMM0,ZMM1,ZMM2,ZMM3]>>,

// Long double types are always returned in FP0 (even with SSE),
// except on Win64.
CCIfNotSubtarget<"isTargetWin64()", CCIfType<[f80], CCAssignToReg<[FP0, FP1]>>>
// except on Win64 and UEFI64.
CCIfNotSubtarget<"isTargetWin64()",
CCIfNotSubtarget<"isTargetUEFI64()",
CCIfType<[f80], CCAssignToReg<[FP0, FP1]>>>>
]>;

// X86-32 C return-value convention.
Expand Down Expand Up @@ -495,6 +497,9 @@ def RetCC_X86_64 : CallingConv<[
// Mingw64 and native Win64 use Win64 CC
CCIfSubtarget<"isTargetWin64()", CCDelegateTo<RetCC_X86_Win64_C>>,

// UEFI64 uses Win64 CC
CCIfSubtarget<"isTargetUEFI64()", CCDelegateTo<RetCC_X86_Win64_C>>,

// Otherwise, drop to normal X86-64 CC
CCDelegateTo<RetCC_X86_64_C>
]>;
Expand Down Expand Up @@ -1085,6 +1090,9 @@ def CC_X86_64 : CallingConv<[
// Mingw64 and native Win64 use Win64 CC
CCIfSubtarget<"isTargetWin64()", CCDelegateTo<CC_X86_Win64_C>>,

// UEFI uses Win64 CC
CCIfSubtarget<"isTargetUEFI64()", CCDelegateTo<CC_X86_Win64_C>>,

// Otherwise, drop to normal X86-64 CC
CCDelegateTo<CC_X86_64_C>
]>;
Expand Down
7 changes: 4 additions & 3 deletions llvm/lib/Target/X86/X86RegisterInfo.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,7 @@ X86RegisterInfo::X86RegisterInfo(const Triple &TT)
// Cache some information.
Is64Bit = TT.isArch64Bit();
IsWin64 = Is64Bit && TT.isOSWindows();
IsUEFI64 = Is64Bit && TT.isUEFI();

// Use a callee-saved register as the base pointer. These registers must
// not conflict with any ABI requirements. For example, in 32-bit mode PIC
Expand Down Expand Up @@ -227,7 +228,7 @@ X86RegisterInfo::getPointerRegClass(const MachineFunction &MF,
const TargetRegisterClass *
X86RegisterInfo::getGPRsForTailCall(const MachineFunction &MF) const {
const Function &F = MF.getFunction();
if (IsWin64 || (F.getCallingConv() == CallingConv::Win64))
if (IsWin64 || IsUEFI64 || (F.getCallingConv() == CallingConv::Win64))
return &X86::GR64_TCW64RegClass;
else if (Is64Bit)
return &X86::GR64_TCRegClass;
Expand Down Expand Up @@ -389,7 +390,7 @@ X86RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
return IsWin64 ? CSR_Win64_SwiftError_SaveList
: CSR_64_SwiftError_SaveList;

if (IsWin64)
if (IsWin64 || IsUEFI64)
return HasSSE ? CSR_Win64_SaveList : CSR_Win64_NoSSE_SaveList;
if (CallsEHReturn)
return CSR_64EHRet_SaveList;
Expand Down Expand Up @@ -514,7 +515,7 @@ X86RegisterInfo::getCallPreservedMask(const MachineFunction &MF,
if (IsSwiftCC)
return IsWin64 ? CSR_Win64_SwiftError_RegMask : CSR_64_SwiftError_RegMask;

return IsWin64 ? CSR_Win64_RegMask : CSR_64_RegMask;
return (IsWin64 || IsUEFI64) ? CSR_Win64_RegMask : CSR_64_RegMask;
}

return CSR_32_RegMask;
Expand Down
4 changes: 4 additions & 0 deletions llvm/lib/Target/X86/X86RegisterInfo.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,10 @@ class X86RegisterInfo final : public X86GenRegisterInfo {
///
bool IsWin64;

/// IsUEFI64 - Is UEFI 64 bit target.
///
bool IsUEFI64;

/// SlotSize - Stack slot size in bytes.
///
unsigned SlotSize;
Expand Down
1 change: 1 addition & 0 deletions llvm/lib/Target/X86/X86Subtarget.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -352,6 +352,7 @@ class X86Subtarget final : public X86GenSubtargetInfo {
switch (CC) {
// On Win64, all these conventions just use the default convention.
case CallingConv::C:
return isTargetWin64() || isTargetUEFI64();
case CallingConv::Fast:
case CallingConv::Tail:
case CallingConv::Swift:
Expand Down