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1d09d56fe1
This adds the actual lib/Target/SystemZ target files necessary to implement the SystemZ target. Note that at this point, the target cannot yet be built since the configure bits are missing. Those will be provided shortly by a follow-on patch. This version of the patch incorporates feedback from reviews by Chris Lattner and Anton Korobeynikov. Thanks to all reviewers! Patch by Richard Sandiford. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181203 91177308-0d34-0410-b5e6-96231b3b80d8
66 lines
3.0 KiB
TableGen
66 lines
3.0 KiB
TableGen
//=- SystemZCallingConv.td - Calling conventions for SystemZ -*- tablegen -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// This describes the calling conventions for the SystemZ ABI.
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//===----------------------------------------------------------------------===//
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class CCIfExtend<CCAction A>
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: CCIf<"ArgFlags.isSExt() || ArgFlags.isZExt()", A>;
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//===----------------------------------------------------------------------===//
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// SVR4 return value calling convention
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//===----------------------------------------------------------------------===//
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def RetCC_SystemZ : CallingConv<[
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// Promote i32 to i64 if it has an explicit extension type.
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CCIfType<[i32], CCIfExtend<CCPromoteToType<i64>>>,
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// ABI-compliant code returns 64-bit integers in R2. Make the other
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// call-clobbered argument registers available for code that doesn't
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// care about the ABI. (R6 is an argument register too, but is
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// call-saved and therefore not suitable for return values.)
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CCIfType<[i32], CCAssignToReg<[R2W, R3W, R4W, R5W]>>,
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CCIfType<[i64], CCAssignToReg<[R2D, R3D, R4D, R5D]>>,
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// ABI-complaint code returns float and double in F0. Make the
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// other floating-point argument registers available for code that
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// doesn't care about the ABI. All floating-point argument registers
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// are call-clobbered, so we can use all of them here.
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CCIfType<[f32], CCAssignToReg<[F0S, F2S, F4S, F6S]>>,
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CCIfType<[f64], CCAssignToReg<[F0D, F2D, F4D, F6D]>>
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// ABI-compliant code returns long double by reference, but that conversion
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// is left to higher-level code. Perhaps we could add an f128 definition
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// here for code that doesn't care about the ABI?
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]>;
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//===----------------------------------------------------------------------===//
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// SVR4 argument calling conventions
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//===----------------------------------------------------------------------===//
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def CC_SystemZ : CallingConv<[
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// Promote i32 to i64 if it has an explicit extension type.
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// The convention is that true integer arguments that are smaller
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// than 64 bits should be marked as extended, but structures that
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// are smaller than 64 bits shouldn't.
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CCIfType<[i32], CCIfExtend<CCPromoteToType<i64>>>,
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// Force long double values to the stack and pass i64 pointers to them.
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CCIfType<[f128], CCPassIndirect<i64>>,
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// The first 5 integer arguments are passed in R2-R6. Note that R6
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// is call-saved.
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CCIfType<[i32], CCAssignToReg<[R2W, R3W, R4W, R5W, R6W]>>,
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CCIfType<[i64], CCAssignToReg<[R2D, R3D, R4D, R5D, R6D]>>,
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// The first 4 float and double arguments are passed in even registers F0-F6.
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CCIfType<[f32], CCAssignToReg<[F0S, F2S, F4S, F6S]>>,
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CCIfType<[f64], CCAssignToReg<[F0D, F2D, F4D, F6D]>>,
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// Other arguments are passed in 8-byte-aligned 8-byte stack slots.
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CCIfType<[i32, i64, f32, f64], CCAssignToStack<8, 8>>
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]>;
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