Mesa NIR backend (NAK/LLVMpipe) (#12089)

* nak works

* TestOps::test_add works

* testop has no crashes

* fix bool casts

* fix typo

* add disassemble

* RANGE and locals/regs

* simplify NAKCompiler

* disass cleanup

* cleanup nir codegen

* almost all tests passing

* cleanup notes in extra/

* old notes

* only import nak if NIR=1

* fix new SPECIAL syntax

* fix local/shared memory

* more tests passing

* add DEFINE_VAR support

* llvmpipe kinda works

* diskcache

* some mypy stuff

* lvp passing test_ops.py

* fix imports

* actually fix imports

* remove 'stdout'

* fix llvm import

* fix mypy issues

* nicer errors

* simpler test_dtype skips

* test lvp in CI

* fix github action syntax

* fix more actions typos

* switch to mesa 25.1.0

* diskcache_put

* better generation for lvp nir_options

* b64encode shader blobs

* Revert diskcache changes

This reverts commits 930fa3de8a and 8428c694b3.

* general cleanup

* better error messages

* fix llvm import

* fix windows tests

* link with libm and libgcc_s

* fix some errors

* dont check for 'float4'

* NIR uses pointer arithmetic

* use tinymesa

* bump tinymesa

* bump tinymesa again

* update lvp nir_options

* print nir shader with DEBUG

* simplify LVPCompiler

* more tests

* "gated" STORE

* NAK is cacheable

* more tests

* all tests pass locally for NAK

* test autogen in CI

* autogen deps

* more deps

* fix uop_gc

* fix macos

* mypy

* save 2 lines

* save two more lines

* save 1 line

* save 4 lines

* save more lines

* Revert "save more lines"

This reverts commit dd3a720c5a.

* save more lines

* fix LVP on windows

* refactor

* reorganize some code

* refactor lib_gpu

* move LVP check

* out of order loads

* remove support.mesa

* bump tinymesa version

* simplify LVP jit

* macos

* macos ci

* shell: bash

* testing

* more testing

* compute brew prefix

* stupid typo

* actually fix

* lib

* stdout on macos

* inline gallivm_compile_module

* Revert "inline gallivm_compile_module"

This reverts commit b65983b151.

* elf macos

* semicolon

* inherit from CPULLVMCompiler

* ruff

* disas test

* fix libm linking

* default is fine actually

* arm works

* add elf loader link test

* fix NAK beam

* pylint is too smart by half

---------

Co-authored-by: George Hotz <72895+geohot@users.noreply.github.com>
Co-authored-by: nimlgen <138685161+nimlgen@users.noreply.github.com>

test/test_tensor.py

@@ -9,6 +9,7 @@ from hypothesis import given, settings, strategies as strat
 from tinygrad.device import is_dtype_supported
 from tinygrad.uop.ops import Ops, UOp
 from tinygrad.renderer.ptx import PTXRenderer
+from tinygrad.renderer.nir import NIRRenderer
 from tinygrad.codegen import full_rewrite
 from tinygrad.dtype import DType
 
@@ -871,7 +872,8 @@ class TestIdxUpcast(unittest.TestCase):
     store = next(uop for uop in uops if uop.op is Ops.STORE)
     assert store.op is Ops.STORE
     idx = self._find_op(store, Ops.INDEX)
-    if idx is not None: # PTX turns Ops.INDEX into pointer arithmetic earlier than cstyle, plus it's already cast to int64
+    # PTX and NIR turn Ops.INDEX into pointer arithmetic earlier than cstyle, plus it's already cast to int64
+    if not isinstance(Device[Device.DEFAULT].renderer, (PTXRenderer, NIRRenderer)):
       assert idx.op is Ops.INDEX
       idx_val = idx.src[1]
       assert idx_val.dtype is dtype
@@ -895,7 +897,7 @@ class TestIdxUpcast(unittest.TestCase):
   def test_regular_sym(self):
     self.do_op_then_assert(dtypes.int, 2048, 2048, UOp.variable("dim3", 1, 64).bind(32))
 
-  @unittest.skipIf(isinstance(Device[Device.DEFAULT].renderer, PTXRenderer), "PTX always convert Ops.INDEX to int64")
+  @unittest.skipIf(isinstance(Device[Device.DEFAULT].renderer, (PTXRenderer, NIRRenderer)), "PTX and NIR always converts Ops.INDEX to int64")
   def test_symfold(self):
     # This would cause an overflow, but after sym fold it's within int32
     a = Tensor.arange(65535)