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148 lines
8.4 KiB
148 lines
8.4 KiB
11 months ago
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from typing import Final, Dict, Callable, Any, List, Optional, Tuple
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from llvmlite import ir # type: ignore
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from tinygrad.codegen.linearizer import UOps, UOp
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from tinygrad.helpers import dtypes
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from tinygrad.ops import Op, UnaryOps, BinaryOps, TernaryOps
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LLVM_FAST_MATH_FLAGS = ('nsz', 'arcp', 'contract', 'afn', 'reassoc') # All from fast math, but nnan and ninf
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code_for_op: Final[Dict[Op, Callable]] = {
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UnaryOps.NEG: lambda builder,x: builder.neg(x) if isinstance(x.type, ir.IntType) else builder.fneg(x, flags=LLVM_FAST_MATH_FLAGS),
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UnaryOps.EXP2: lambda builder,x: builder.call(builder._block.module.declare_intrinsic('llvm.exp2', [ir.FloatType()]), [x], fastmath=LLVM_FAST_MATH_FLAGS),
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UnaryOps.LOG2: lambda builder,x: builder.call(builder._block.module.declare_intrinsic('llvm.log2', [ir.FloatType()]), [x], fastmath=LLVM_FAST_MATH_FLAGS),
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UnaryOps.SIN: lambda builder,x: builder.call(builder._block.module.declare_intrinsic('llvm.sin', [ir.FloatType()]), [x], fastmath=LLVM_FAST_MATH_FLAGS),
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UnaryOps.SQRT: lambda builder,x: builder.call(builder._block.module.declare_intrinsic('llvm.sqrt', [ir.FloatType()]), [x], fastmath=LLVM_FAST_MATH_FLAGS),
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BinaryOps.ADD: lambda builder,x,y: builder.add(x,y) if isinstance(x.type, ir.IntType) else builder.fadd(x,y, flags=LLVM_FAST_MATH_FLAGS),
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BinaryOps.SUB: lambda builder,x,y: builder.sub(x,y) if isinstance(x.type, ir.IntType) else builder.fsub(x,y, flags=LLVM_FAST_MATH_FLAGS),
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BinaryOps.MUL: lambda builder,x,y: builder.mul(x,y) if isinstance(x.type, ir.IntType) else builder.fmul(x,y, flags=LLVM_FAST_MATH_FLAGS),
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BinaryOps.DIV: lambda builder,x,y: builder.sdiv(x,y) if isinstance(x.type, ir.IntType) else builder.fdiv(x,y, flags=LLVM_FAST_MATH_FLAGS),
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# TODO: this should be casted
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BinaryOps.CMPLT: lambda builder,x,y: builder.zext(builder.icmp_signed("<", x, y),ir.IntType(32)) if isinstance(x.type, ir.IntType) else builder.uitofp(builder.fcmp_ordered("<", x, y, flags=LLVM_FAST_MATH_FLAGS), ir.FloatType()),
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BinaryOps.MAX: lambda builder,x,y: builder.select(builder.fcmp_unordered(">", x, y, flags=LLVM_FAST_MATH_FLAGS), x, y, flags=LLVM_FAST_MATH_FLAGS),
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BinaryOps.MOD: lambda builder,x,y: builder.srem(x,y),
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TernaryOps.MULACC: lambda builder,x,y,z: builder.fadd(builder.fmul(x,y, flags=LLVM_FAST_MATH_FLAGS), z, flags=LLVM_FAST_MATH_FLAGS),
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TernaryOps.WHERE: lambda builder,x,y,z: builder.select(builder.fcmp_unordered("!=", x, ir.Constant(ir.FloatType(), 0), flags=LLVM_FAST_MATH_FLAGS) if isinstance(x.type, ir.FloatType) else builder.trunc(x, ir.IntType(1)), y, z, flags=LLVM_FAST_MATH_FLAGS),
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}
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dtype_to_llvm_dtype = {dtypes.float64:ir.DoubleType(), dtypes.float16:ir.HalfType(), dtypes.bfloat16:ir.IntType(16), dtypes.float32:ir.FloatType(), dtypes.int8:ir.IntType(8), dtypes.uint8:ir.IntType(8), dtypes.bool: ir.IntType(1), dtypes.int64: ir.IntType(64), dtypes.int32: ir.IntType(32), dtypes._arg_int32: ir.IntType(32), dtypes.int16:ir.IntType(16), dtypes.uint16:ir.IntType(16), dtypes.uint32:ir.IntType(32), dtypes.uint64:ir.IntType(64)}
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def cast(bb, val, input_type, output_type):
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if input_type == output_type: return val
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if output_type == dtypes.float32:
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if dtypes.is_int(input_type) or input_type == dtypes.bool:
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val = bb[-1].uitofp(val, ir.FloatType()) if dtypes.is_unsigned(input_type) or input_type == dtypes.bool else bb[-1].sitofp(val, ir.FloatType())
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elif input_type == dtypes.bfloat16:
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val = bb[-1].sext(val, ir.IntType(32))
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val = bb[-1].shl(val, ir.Constant(ir.IntType(32), 16))
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val = bb[-1].bitcast(val, ir.FloatType())
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elif input_type == dtypes.float64:
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val = bb[-1].fptrunc(val, ir.FloatType())
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else:
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val = bb[-1].fpext(val, ir.FloatType())
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return val
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if input_type == dtypes.float32:
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if dtypes.is_int(output_type) or output_type == dtypes.bool:
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if dtypes.is_unsigned(output_type): val = bb[-1].fptoui(val, dtype_to_llvm_dtype[output_type])
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elif output_type == dtypes.bool: val = bb[-1].fcmp_ordered("!=", val, ir.Constant(ir.FloatType(), 0), flags=LLVM_FAST_MATH_FLAGS)
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else: val = bb[-1].fptosi(val, dtype_to_llvm_dtype[output_type])
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elif output_type == dtypes.bfloat16:
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val = bb[-1].bitcast(val, ir.IntType(32))
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val = bb[-1].lshr(val, ir.Constant(ir.IntType(32), 16))
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val = bb[-1].trunc(val, ir.IntType(16))
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elif output_type == dtypes.float64:
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val = bb[-1].fpext(val, ir.DoubleType())
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else:
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val = bb[-1].fptrunc(val, dtype_to_llvm_dtype[output_type])
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return val
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raise NotImplementedError(f"cast from {input_type} -> {output_type} not implemented")
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def uops_to_llvm_ir(function_name:str, uops:List[UOp]) -> Tuple[str, Dict]:
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# all llvm stuff goes into a module
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module = ir.Module(name=__file__)
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# extract global buffers
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buf_to_dtype = {args[0]:args[1] for uop,_,_,args,_ in uops if uop == UOps.DEFINE_GLOBAL}
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buf_index = {x:i for i,x in enumerate(buf_to_dtype.keys())}
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# create llvm function
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func_dtypes = [(dtype_to_llvm_dtype[dtype],dtype) for dtype in buf_to_dtype.values()]
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func = ir.Function(module, ir.FunctionType(ir.VoidType(), [x.as_pointer() if dt!=dtypes._arg_int32 else x for x,dt in func_dtypes]), name=function_name)
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for a in func.args:
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if a.type.is_pointer: a.add_attribute("noalias")
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# add the function attribute "no-nans-fp-math"="true", which informs llvm that it allowed to use vectorization optimizations
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func.attributes._known = func.attributes._known.union(frozenset(['"no-nans-fp-math"="true"']))
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func.attributes.add('"no-nans-fp-math"="true"')
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bb = [ir.IRBuilder(func.append_basic_block("entry"))]
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loop_blocks: List = []
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reduce_phis: List = []
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# TODO: newvar probably shouldn't be optional
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lvars: Dict[Optional[UOp], Any] = {} # this Any is an llvm type
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for bufname,dtype in buf_to_dtype.items():
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if dtype == dtypes._arg_int32: lvars[bufname] = bb[-1].sext(func.args[buf_index[bufname]], ir.IntType(32))
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for u in uops:
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uop,dtype,vin,args,_ = u
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if uop == UOps.LOOP:
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bb.append(ir.IRBuilder(func.append_basic_block(f"loop_body_{len(loop_blocks)}")))
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bb[-2].branch(bb[-1]._block)
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phis = []
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for rp in reduce_phis:
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incoming = lvars[rp]
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lvars[rp] = bb[-1].phi(ir.FloatType())
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lvars[rp].add_incoming(incoming, bb[-2]._block)
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phis.append((rp, lvars[rp]))
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lvars[u] = bb[-1].phi(ir.IntType(32), name=f"loop{len(loop_blocks)}")
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lvars[u].add_incoming(lvars[vin[0]], bb[-2]._block)
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loop_blocks.append((bb[-1], phis))
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if uop == UOps.END:
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block, phis = loop_blocks.pop()
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idx_p1 = bb[-1].add(lvars[vin[0]], ir.Constant(ir.IntType(32), 1))
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lvars[vin[0]].add_incoming(idx_p1, bb[-1]._block)
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for n,phi in phis: phi.add_incoming(lvars[n], bb[-1]._block)
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bb.append(ir.IRBuilder(func.append_basic_block(f"loop_exit_{len(loop_blocks)}")))
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bb[-2].cbranch(bb[-2].icmp_unsigned("<", idx_p1, lvars[vin[0].vin[1]]), block._block, bb[-1]._block)
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if uop == UOps.DEFINE_GLOBAL:
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lvars[u] = func.args[buf_index[args[0]]]
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if uop == UOps.DEFINE_ACC:
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lvars[u] = ir.Constant(dtype_to_llvm_dtype[dtype], args)
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reduce_phis.append(u)
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if uop == UOps.SPECIAL:
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lvars[u] = lvars[args.expr]
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if uop == UOps.CONST:
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value = int(args) if dtypes.is_int(dtype) else bool(args) if dtype == dtypes.bool else args
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lvars[u] = ir.Constant(dtype_to_llvm_dtype[dtype], value)
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if uop == UOps.LOAD:
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assert dtype is not None
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if len(vin) > 2:
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gate = bb[-1].trunc(lvars[vin[2]], ir.IntType(1))
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aug_idx = bb[-1].select(gate, lvars[vin[1]], ir.Constant(ir.IntType(32), 0))
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val = bb[-1].load(bb[-1].gep(lvars[vin[0]], [aug_idx], inbounds=True))
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val = cast(bb, val, vin[0].dtype, dtype)
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val = bb[-1].select(gate, val, lvars[vin[3]])
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else:
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val = bb[-1].load(bb[-1].gep(lvars[vin[0]], [lvars[vin[1]]], inbounds=True))
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val = cast(bb, val, vin[0].dtype, dtype)
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lvars[u] = val
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if uop == UOps.PHI:
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lvars[u] = lvars[vin[1]]
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# PHI UOps can link to other PHI Uops, backtrace this to DEFINE_ACC
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backward = vin[0]
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while backward.uop == UOps.PHI: backward = backward.vin[0]
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lvars[backward] = lvars[u]
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if uop == UOps.STORE:
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element = cast(bb, lvars[vin[2]], vin[2].dtype, vin[0].dtype)
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bb[-1].store(element, bb[-1].gep(lvars[vin[0]], [lvars[vin[1]]], inbounds=True))
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if uop == UOps.ALU:
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lvars[u] = code_for_op[args](bb[-1], *[lvars[x] for x in vin])
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bb[-1].ret_void()
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return str(module), {}
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