Add `$macc_v2` #1492

Job	Run time
pre_job	8s
test-compile (ubuntu-latest, clang-14)	11m 7s
test-compile (ubuntu-latest, gcc-10)	11m 41s
test-compile (ubuntu-latest, clang-18)	22m 37s
test-compile (ubuntu-latest, gcc-13)	24m 36s
test-compile (macos-13, clang)	17m 35s
test-compile (ubuntu-20.04, clang-10)	12m 6s
	1h 39m 50s

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