don't const rewrite in cstyle (tinygrad#7442)

* don't const rewrite in cstyle

* Update cstyle.py

* simple_symbolic

* fix bfloat16 const on AMD

test/helpers.py

@@ -34,7 +34,7 @@ def assert_jit_cache_len(fxn, expected_len):
 def is_dtype_supported(dtype: DType, device: str = Device.DEFAULT):
   if dtype == dtypes.bfloat16:
     # NOTE: this requires bf16 buffer support
-    return device in {"AMD"} or (device in {"CUDA", "NV"} and not CI and not getenv("PTX"))
+    return device in {"AMD"} or (device in {"CUDA", "NV", "METAL"} and not CI and not getenv("PTX"))
   if device in ["WEBGPU", "WEBGL"]: return dtype in [dtypes.float, dtypes.int32, dtypes.uint32]
   # for CI GPU and OSX, cl_khr_fp16 isn't supported
   # for CI LLVM, it segfaults because it can't link to the casting function

test_driven_development.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+python3 test/external/process_replay/reset.py
+RUN_PROCESS_REPLAY=1 pytest -n auto test/test_tiny.py test/test_uop_graph.py test/test_ops.py test/test_linearizer.py
+while true; do
+  if python3 test/test_tiny.py; then
+    PYTHONPATH="." python3 test/external/process_replay/process_replay.py
+  fi
+done

tinygrad/codegen/uopgraph.py

@@ -3,7 +3,7 @@
 import functools, itertools, operator
 from collections import defaultdict
 from tinygrad.dtype import dtypes, ImageDType, PtrDType
-from tinygrad.ops import UnaryOps, BinaryOps, TernaryOps, UOp, UOps, UPat, PatternMatcher, symbolic_flat
+from tinygrad.ops import UnaryOps, BinaryOps, TernaryOps, UOp, UOps, UPat, PatternMatcher, symbolic_flat, symbolic_simple
 from tinygrad.ops import graph_rewrite, is_irreducible, split_uop, identity_element, uop_given_valid, parse_valid, is_increasing, simplify_valid
 from tinygrad.helpers import DEBUG, getenv, flatten, dedup, TRANSCENDENTAL, AMX, prod, partition, all_same
 from tinygrad.codegen.transcendental import xexp2, xlog2, xsin, TRANSCENDENTAL_SUPPORTED_DTYPES
@@ -525,5 +525,5 @@ def full_graph_rewrite(sink:UOp, opts:Optional[Renderer]=None) -> UOp:
   sink = graph_rewrite(sink, sym+get_extra_patterns(tuple(opts.code_for_op.keys()) if opts is not None else (), TRANSCENDENTAL>=2))
 
   # for rendering without sym (including the rules from the renderer)
-  sink = graph_rewrite(sink, pm_render+opts.extra_matcher if opts is not None and opts.extra_matcher is not None else pm_render)
+  sink = graph_rewrite(sink, symbolic_simple+(pm_render+opts.extra_matcher if opts is not None and opts.extra_matcher is not None else pm_render))
   return sink

tinygrad/ops.py

@@ -1003,7 +1003,7 @@ def max_var_const(x:UOp, c1:UOp, c2:UOp):
   if x.vmin >= 0: return x*c1 if c1.arg >= c2.arg else x*c2
   if x.vmax <= 0: return x*c2 if c1.arg >= c2.arg else x*c1
 
-symbolic = PatternMatcher([
+symbolic_simple = PatternMatcher([
   # ** self folding **
   (UPat.var("x") + 0, lambda x: x),    # x+0 -> x
   (UPat.var("x") * 1, lambda x: x),    # x*1 -> x
@@ -1036,6 +1036,12 @@ def max_var_const(x:UOp, c1:UOp, c2:UOp):
   (UPat.var('x', dtype=dtypes.bool) * UPat.var('y'), lambda x,y: x&y),
   (UPat.var('x', dtype=dtypes.bool) + UPat.var('y'), lambda x,y: x|y),
   (UPat.var('x', dtype=dtypes.bool).maximum(UPat.var('y')), lambda x,y: x|y),
+  # *** cast ***
+  (UPat(UOps.CAST, name="root", src=UPat.cvar("c")), lambda root, c: root.const_like(c.arg)),
+  (UPat(UOps.CAST, name="root"), lambda root: root.src[0] if root.dtype == root.src[0].dtype else None),
+])
+
+symbolic = symbolic_simple+PatternMatcher([
   # group like
   ((UPat.var("x") + UPat.var("y")) + UPat.var("x") * UPat.cvar("c"), lambda x,y,c: (x+x*c)+y),
   # ** combine terms **
@@ -1091,9 +1097,6 @@ def max_var_const(x:UOp, c1:UOp, c2:UOp):
   # ** mod **
   # mod folding
   (UPat.var("x") % UPat.cvar("c", vec=False), lambda x,c: newx if 0 < c.arg and (newx:=mod_folding(x,c.arg)) is not None else None),
-  # *** cast ***
-  (UPat(UOps.CAST, name="root", src=UPat.cvar("c")), lambda root, c: root.const_like(c.arg)),
-  (UPat(UOps.CAST, name="root"), lambda root: root.src[0] if root.dtype == root.src[0].dtype else None),
 ])
 
 symbolic_flat = symbolic+PatternMatcher([

tinygrad/renderer/cstyle.py

@@ -34,6 +34,11 @@
   (UPat(UOps.CONST, dtype=dtypes.uint64, name="x"), lambda ctx,x: f"{x.arg}ull"),
   (UPat(UOps.CONST, dtype=dtypes.uint32, name="x"), lambda ctx,x: f"{x.arg}u"),
   (UPat(UOps.CONST, dtype=dtypes.bool, name="x"), lambda ctx,x: "1" if x.arg else "0"),
+  # consts are rendered to larger type and casted
+  (UPat(UOps.CONST, (dtypes.bfloat16, dtypes.half), name="x"), lambda ctx,x: f"(({ctx.render_dtype(x.dtype)}){x.arg}f)"),
+  (UPat(UOps.CONST, (dtypes.uint8, dtypes.uint16), name="x"), lambda ctx,x: f"(({ctx.render_dtype(x.dtype)}){x.arg}u)"),
+  (UPat(UOps.CONST, (dtypes.int8, dtypes.int16), name="x"), lambda ctx,x: f"(({ctx.render_dtype(x.dtype)}){x.arg})"),
+  # default const render
   (UPat(UOps.CONST, name="x"), lambda ctx,x: str(x.arg)),
   # new load/store
   (UPat(UOps.INDEX, src=(UPat.var("buf"), UPat.var('idx'))),
@@ -49,10 +54,6 @@
 ])
 
 extra_pm = PatternMatcher([
-  # consts are rendered to larger type and casted
-  (UPat(UOps.CONST, (dtypes.bfloat16, dtypes.half), name="c"), lambda c: UOp.const(dtypes.float, c.arg).cast(c.dtype)),
-  (UPat(UOps.CONST, (dtypes.uint8, dtypes.uint16), name="c"), lambda c: UOp.const(dtypes.uint32, c.arg).cast(c.dtype)),
-  (UPat(UOps.CONST, (dtypes.int8, dtypes.int16), name="c"), lambda c: UOp.const(dtypes.int32, c.arg).cast(c.dtype)),
   # insert a NOOP before BITCAST to force it to be rendered. not needed on all backends?
   (UPat(UOps.BITCAST, name="x"),
    lambda x: UOp(UOps.BITCAST, x.dtype, (UOp(UOps.NOOP, x.src[0].dtype, x.src),)) if x.src[0].op is not UOps.NOOP else None),
@@ -396,6 +397,7 @@ class AMDRenderer(CStyleLanguage):
     (UPat(UOps.CAST, name="x", src=UPat.var("y", dtypes.bfloat16)),lambda x,y: y.cast(dtypes.float).cast(x.dtype) if x.dtype!=dtypes.float else None),
     (UPat(UOps.CAST, dtypes.bfloat16, UPat.var("x")),lambda x: x.cast(dtypes.float).cast(dtypes.bfloat16) if x.dtype!=dtypes.float else None),
     # bfloat16 casting
+    (UPat.cvar('x', dtypes.bfloat16), lambda x: cast_float_to_bf16(UOp.const(dtypes.float, x.arg))),
     (UPat(UOps.CAST, dtype=dtypes.float, src=UPat.var("x", dtype=dtypes.bfloat16)),
       lambda x: (x.bitcast(dtypes.ushort).cast(dtypes.uint)<<16).bitcast(dtypes.float)),
     (UPat(UOps.CAST, dtype=dtypes.bfloat16, src=UPat.var("x", dtype=dtypes.float)), cast_float_to_bf16)]) + extra_pm

tinygrad/renderer/ptx.py

@@ -1,7 +1,7 @@
 from typing import DefaultDict, Dict, List, Union, Optional, cast, Callable
 import struct
 from collections import defaultdict
-from tinygrad.ops import BinaryOps, UnaryOps, TernaryOps, Op, UOps, UOp, PatternMatcher, UPat, symbolic
+from tinygrad.ops import BinaryOps, UnaryOps, TernaryOps, Op, UOps, UOp, PatternMatcher, UPat
 from tinygrad.dtype import dtypes, DType, PtrDType, ConstType
 from tinygrad.renderer import Renderer
 from tinygrad.renderer.cstyle import CUDARenderer
@@ -33,7 +33,7 @@ def render_val(x, dtype):
 }
 
 supports_half: List[Op] = [UnaryOps.EXP2, BinaryOps.ADD, BinaryOps.MUL, BinaryOps.MAX, BinaryOps.CMPLT, TernaryOps.WHERE]
-ptx_matcher = symbolic+PatternMatcher([
+ptx_matcher = PatternMatcher([
   # bool CMPNE is XOR, bool CMPLT is XOR+AND (universal makes this slow, this is for renderer only)
   (UPat.var('x', dtype=dtypes.bool).ne(UPat.var('y')), lambda x,y: x^y),
   (UPat.var('x', dtype=dtypes.bool).lt(UPat.var('y')), lambda x,y: (x^True)&y),