-//===- X86CallingConv.td - Calling Conventions for X86 32/64 ----*- C++ -*-===//
+//===- X86CallingConv.td - Calling Conventions X86 32/64 ---*- tablegen -*-===//
//
// The LLVM Compiler Infrastructure
//
CCIfType<[v8i8, v4i16, v2i32, v1i64], CCAssignToStack<8, 8>>
]>;
+// Tail call convention (fast): One register is reserved for target address,
+// namely R9
+def CC_X86_64_TailCall : CallingConv<[
+ // Promote i8/i16 arguments to i32.
+ CCIfType<[i8, i16], CCPromoteToType<i32>>,
+
+ CCIfStruct<CCStructAssign<[RDI, RSI, RDX, RCX, R8]>>,
+
+ // The first 6 integer arguments are passed in integer registers.
+ CCIfType<[i32], CCAssignToReg<[EDI, ESI, EDX, ECX, R8D]>>,
+ CCIfType<[i64], CCAssignToReg<[RDI, RSI, RDX, RCX, R8]>>,
+
+ // The first 8 FP/Vector arguments are passed in XMM registers.
+ CCIfType<[f32, f64, v16i8, v8i16, v4i32, v2i64, v4f32, v2f64],
+ CCAssignToReg<[XMM0, XMM1, XMM2, XMM3, XMM4, XMM5, XMM6, XMM7]>>,
+
+ // The first 8 MMX vector arguments are passed in GPRs.
+ CCIfType<[v8i8, v4i16, v2i32, v1i64],
+ CCAssignToReg<[RDI, RSI, RDX, RCX, R8]>>,
+
+ // The 'nest' parameter, if any, is passed in R10.
+ CCIfNest<CCAssignToReg<[R10]>>,
+
+ // Integer/FP values get stored in stack slots that are 8 bytes in size and
+ // 8-byte aligned if there are no more registers to hold them.
+ CCIfType<[i32, i64, f32, f64], CCAssignToStack<8, 8>>,
+
+ // Vectors get 16-byte stack slots that are 16-byte aligned.
+ CCIfType<[v16i8, v8i16, v4i32, v2i64, v4f32, v2f64], CCAssignToStack<16, 16>>,
+
+ // __m64 vectors get 8-byte stack slots that are 8-byte aligned.
+ CCIfType<[v8i8, v4i16, v2i32, v1i64], CCAssignToStack<8, 8>>
+]>;
+
//===----------------------------------------------------------------------===//
// X86 C Calling Convention
CCDelegateTo<CC_X86_32_Common>
]>;
+/// Same as C calling convention except for non-free ECX which is used for storing
+/// a potential pointer to the tail called function.
+def CC_X86_32_TailCall : CallingConv<[
+ // Promote i8/i16 arguments to i32.
+ CCIfType<[i8, i16], CCPromoteToType<i32>>,
+
+ // Nested function trampolines are currently not supported by fastcc.
+
+ // The first 3 integer arguments, if marked 'inreg' and if the call is not
+ // a vararg call, are passed in integer registers.
+ CCIfNotVarArg<CCIfInReg<CCIfType<[i32], CCAssignToReg<[EAX, EDX]>>>>,
+
+ // Otherwise, same as everything else.
+ CCDelegateTo<CC_X86_32_Common>
+]>;
def CC_X86_32_FastCall : CallingConv<[
// Promote i8/i16 arguments to i32.