Revert "change clang -march flag to -mcpu on arm (#10841)" (#10942)

This reverts commit 897e42fd1b.

.github/workflows/test.yml

@@ -920,7 +920,6 @@ jobs:
         with:
           key: macos-${{ matrix.backend }}-minimal
           deps: testing_minimal
-          pydeps: "capstone"
           llvm: ${{ matrix.backend == 'llvm' && 'true' }}
       - name: Set env
         run: printf "${{ matrix.backend == 'llvm' && 'LLVM=1' || matrix.backend == 'cpu' && 'CPU=1' || matrix.backend == 'metal' && 'METAL=1'}}" >> $GITHUB_ENV

test/test_disassembly.py

@@ -1,21 +0,0 @@
-import unittest, io
-from tinygrad import Tensor, dtypes
-from contextlib import redirect_stdout
-from tinygrad.device import Device
-from tinygrad.helpers import OSX
-from tinygrad.engine.realize import get_program
-
-class TestDisassembly(unittest.TestCase):
-  # TODO: fails on llvm. llvm.LLVMGetHostCPUName() returns "generic"
-  @unittest.skipUnless(Device.DEFAULT in ("CPU",) and OSX, "m series cpus support fp16 arithmetic")
-  def test_float16_alu(self):
-    c = Tensor([1], dtype=dtypes.float16) + Tensor([1], dtype=dtypes.float16)
-    s = c.schedule()[-1]
-    p = get_program(Device[Device.DEFAULT].renderer, s.ast)
-    lib = Device[Device.DEFAULT].compiler.compile(p.src)
-    out = io.StringIO()
-    with redirect_stdout(out): Device[Device.DEFAULT].compiler.disassemble(lib)
-    assert "fcvt" not in out.getvalue()
-
-if __name__ == "__main__":
-  unittest.main()

tinygrad/runtime/ops_cpu.py

@@ -11,9 +11,7 @@ class ClangJITCompiler(Compiler):
     # -fno-math-errno is required for __builtin_sqrt to become an instruction instead of a function call
     # x18 is a reserved platform register. It is clobbered on context switch in macos and is used to store TEB pointer in windows on arm, don't use it
     target = 'x86_64' if sys.platform == 'win32' else platform.machine()
-    # on arm march means "runs on this arch and superset" instead of "optimize for this arch". x86 march == arm mcpu
-    arch = '-march=native' if platform.machine() in ('x86_64', 'AMD64') else '-mcpu=native'
-    args = [arch, f'--target={target}-none-unknown-elf', '-O2', '-fPIC', '-ffreestanding', '-fno-math-errno', '-nostdlib', '-fno-ident']
+    args = ['-march=native', f'--target={target}-none-unknown-elf', '-O2', '-fPIC', '-ffreestanding', '-fno-math-errno', '-nostdlib', '-fno-ident']
     arch_args = ['-ffixed-x18'] if target == 'arm64' else []
     obj = subprocess.check_output([getenv("CC", 'clang'), '-c', '-x', 'c', *args, *arch_args, '-', '-o', '-'], input=src.encode('utf-8'))
     return jit_loader(obj)