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base repository: whitequark/Boneless-CPU
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head repository: whitequark/Boneless-CPU
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compare: 8ec21cdb469a
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  • 2 commits
  • 2 files changed
  • 1 contributor

Commits on Dec 27, 2018

  1. XCHG pseudo with both operands being the same is illegal.

    @whitequark
    whitequark committed Dec 27, 2018
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    244d439 View commit details

Commits on Dec 28, 2018

  1. Add comments back to design doc.

    @whitequark
    whitequark committed Dec 28, 2018
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    8ec21cd View commit details
Showing with 10 additions and 5 deletions.
  1. +10 −5 boneless/arch/instr.py
  2. BIN doc/design.ods
15 changes: 10 additions & 5 deletions boneless/arch/instr.py
View file
Original file line number Diff line number Diff line change
@@ -66,10 +66,6 @@ def AND (rd, ra, rb): return [A_FORMAT(OPCODE_LOGIC, OPTYPE_AND, rd, ra, rb)]
def OR (rd, ra, rb): return [A_FORMAT(OPCODE_LOGIC, OPTYPE_OR, rd, ra, rb)]
def XOR (rd, ra, rb): return [A_FORMAT(OPCODE_LOGIC, OPTYPE_XOR, rd, ra, rb)]

def XCHG(rx, ry): return [*XOR(rx, rx, ry),
*XOR(ry, ry, rx),
*XOR(rx, rx, ry)]

def ADD (rd, ra, rb): return [A_FORMAT(OPCODE_ARITH, OPTYPE_ADD, rd, ra, rb)]
def SUB (rd, ra, rb): return [A_FORMAT(OPCODE_ARITH, OPTYPE_SUB, rd, ra, rb)]
def CMP ( ra, rb): return [A_FORMAT(OPCODE_ARITH, OPTYPE_CMP, 0, ra, rb)]
@@ -122,6 +118,8 @@ def JSLT(off): return [C_FORMAT(OPCODE_JSLT, off)]
def JSGT(off): return [C_FORMAT(OPCODE_JSGT, off)]
def JSLE(off): return [C_FORMAT(OPCODE_JSLE, off)]

def ILL(insn): return [insn & 0xffff]

def MOVI(rd, imm16):
assert imm16 in range(65536)
if imm16 in range(256):
@@ -130,7 +128,14 @@ def MOVI(rd, imm16):
return MOVH(rd, (imm16 >> 8) + ((imm16 >> 7) & 1)) + \
[I_FORMAT(OPCODE_ADDI, rd, imm16 & 0xff, u=True)]

def ILL(insn): return [insn & 0xffff]

def XCHG(rx, ry):
assert rx != ry
return [
*XOR(rx, rx, ry),
*XOR(ry, ry, rx),
*XOR(rx, rx, ry)
]


def L(label): return label
Binary file modified doc/design.ods
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