[PATCH] D14300: MSP430 calling convention updates

[Anna Youssefi via llvm-commits]

Annahita created this revision.
Annahita added a reviewer: asl.
Annahita added a subscriber: llvm-commits.

This code updates the MSP430 target calling convention to conform to the MSP430 EABI in order to make it compatible with the new MSP430-GCC framework.

It includes:
 1) Pass args in R12-R15
 2) Return args in R12-R15
 3) Store on stack and pass in registers starting with least significant word
 4) 32-bit argument may be split between register (R15) and stack if no args placed on stack yet
 5) Register ‘holes’ may be back-filled (but only by arguments that fit entirely in regs, no split args once first arg placed on stack)
 6) Only R4 through R10 are callee-saved registers; R11 is updated to be caller-save

http://reviews.llvm.org/D14300

Files:
  lib/Target/MSP430/MSP430CallingConv.td
  lib/Target/MSP430/MSP430ISelLowering.cpp
  lib/Target/MSP430/MSP430RegisterInfo.cpp
  test/CodeGen/MSP430/AddrMode-bis-rx.ll
  test/CodeGen/MSP430/AddrMode-bis-xr.ll
  test/CodeGen/MSP430/AddrMode-mov-rx.ll
  test/CodeGen/MSP430/AddrMode-mov-xr.ll
  test/CodeGen/MSP430/Inst16mr.ll
  test/CodeGen/MSP430/Inst16ri.ll
  test/CodeGen/MSP430/Inst16rm.ll
  test/CodeGen/MSP430/Inst16rr.ll
  test/CodeGen/MSP430/Inst8mr.ll
  test/CodeGen/MSP430/Inst8ri.ll
  test/CodeGen/MSP430/Inst8rm.ll
  test/CodeGen/MSP430/Inst8rr.ll
  test/CodeGen/MSP430/bit.ll
  test/CodeGen/MSP430/byval.ll
  test/CodeGen/MSP430/cc_args.ll
  test/CodeGen/MSP430/cc_ret.ll
  test/CodeGen/MSP430/indirectbr2.ll
  test/CodeGen/MSP430/jumptable.ll
  test/CodeGen/MSP430/memset.ll
  test/CodeGen/MSP430/setcc.ll
  test/CodeGen/MSP430/vararg.ll

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