Add `$macc_v2` #1575

Job	Run time
pre_job	6s
test-compile (ubuntu-latest, clang-14)	11m 46s
test-compile (ubuntu-latest, gcc-10)	11m 15s
test-compile (ubuntu-latest, clang-18)	21m 40s
test-compile (ubuntu-latest, gcc-13)	29m 3s
test-compile (macos-13, clang)	25m 52s
test-compile (ubuntu-20.04, clang-10)	13m 32s
	1h 53m 14s

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