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authorBjörn Gustavsson <[email protected]>2015-01-27 09:16:07 +0100
committerBjörn Gustavsson <[email protected]>2015-01-29 09:37:17 +0100
commit25603134a658a64d5b024fe1668d9db6f331b2e2 (patch)
tree351a0310742d6730b87c1285de20ad1b46664621 /otp_versions.table
parent440c54f6a6b78015e8c8e0c7d16ad3cbb3d22147 (diff)
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Move grouping of map constructions from v3_core to v3_kernel
When translating a function with map construction: f(A) -> B = b, C = c, #{A=>1,B=>2,C=>3}. v3_core would break apart the map construction into three parts because of the way the map instructions in BEAM work -- variable keys need to be in their own instruction. In the example, constant propagation will turn two of the keys to literal keys. But the initial breaking apart will not be undone, so there will still be three map constructions: 'f'/1 = fun (_cor0) -> let <_cor3> = ~{::<_cor0,1>}~ in let <_cor4> = ~{::<'b',2>|_cor3}~ in ~{::<'c',3>|_cor4}~ It would be possible to complicate the sys_core_fold pass to regroup map operations so that we would get: 'f'/1 = fun (_cor0) -> let <_cor3> = ~{::<_cor0,1>}~ in ~{::<'b',2>,::<'c',3>|_cor3}~ A simpler way that allows to simplify the translation is to skip the grouping in v3_core and translate the function to: 'f'/1 = fun (_cor0) -> ~{::<_cor0,1>,::<'b',2>,::<'c',3>}~ We will then let v3_kernel do the grouping while translating from Core Erlang to Kernel Erlang.
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