- // Promote i8/i16/i32 arguments to i64.
- CCIfType<[i8, i16, i32], CCPromoteToType<i64>>,
-
- // The first 5 integer arguments of non-varargs functions are passed in
- // integer registers.
- // FIXME: Check stuff for varagrs
- CCIfNotVarArg<CCIfType<[i64],
- CCAssignToReg<[R2D, R3D, R4D, R5D, R6D]>>>,
-
- // Integer values get stored in stack slots that are 8 bytes in
- // size and 8-byte aligned.
- CCIfType<[i64], CCAssignToStack<8, 8>>
+ // Promote i32 to i64 if it has an explicit extension type.
+ // The convention is that true integer arguments that are smaller
+ // than 64 bits should be marked as extended, but structures that
+ // are smaller than 64 bits shouldn't.
+ CCIfType<[i32], CCIfExtend<CCPromoteToType<i64>>>,
+
+ // Force long double values to the stack and pass i64 pointers to them.
+ CCIfType<[f128], CCPassIndirect<i64>>,
+
+ // The first 5 integer arguments are passed in R2-R6. Note that R6
+ // is call-saved.
+ CCIfType<[i32], CCAssignToReg<[R2L, R3L, R4L, R5L, R6L]>>,
+ CCIfType<[i64], CCAssignToReg<[R2D, R3D, R4D, R5D, R6D]>>,
+
+ // The first 4 float and double arguments are passed in even registers F0-F6.
+ CCIfType<[f32], CCAssignToReg<[F0S, F2S, F4S, F6S]>>,
+ CCIfType<[f64], CCAssignToReg<[F0D, F2D, F4D, F6D]>>,
+
+ // Other arguments are passed in 8-byte-aligned 8-byte stack slots.
+ CCIfType<[i32, i64, f32, f64], CCAssignToStack<8, 8>>