LLVM: CPU threading support (#14320)

* make generic llvmrenderer class for cpu and amd

* move `tensor_cores` back to parent

* remove empty line

* restore extra matcher position

* add threading

* dont need to add core_id here

* dont move code for workitem

* cleanup

---------

Co-authored-by: TheVanadium <claude_user@ret2022.localdomain>

tinygrad/renderer/llvmir.py

@@ -6,7 +6,7 @@ from tinygrad.renderer.cstyle import AMDHIPRenderer, create_non_native_float_pat
 from tinygrad.uop.decompositions import xexp2, xlog2
 from tinygrad.uop.ops import UOp, PatternMatcher, UPat, Ops, GroupOp, range_str
 from tinygrad.dtype import dtypes, float_to_fp8, DType, PtrDType, truncate
-from tinygrad.helpers import prod, AMX
+from tinygrad.helpers import prod, AMX, CPU_COUNT, getenv
 
 def ldt(dt:DType):
   if dt.vcount > 1: return f"<{dt.vcount} x {ldt(dt.scalar())}>"
@@ -199,7 +199,8 @@ class LLVMRenderer(Renderer):
 class CPULLVMRenderer(LLVMRenderer):
   device = "CPU"
   has_local = False
-  global_max: tuple[int, ...] | None = None
+  has_threads = bool(getenv("THREADS", 1))
+  global_max = (CPU_COUNT.value, 0, 0)
   abi = 'win64cc' if sys.platform == 'win32' else None
   string_rewrite = base_rewrite + PatternMatcher([(UPat(Ops.WMMA, name="wmma"), render_wmma_amx)])
   def render(self, uops: list[UOp]) -> str: return "\n".join((k:=self._render_kernel(uops))[0] + (k[1], self._render_footer(uops)))