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authorBjörn Gustavsson <[email protected]>2015-04-16 08:14:28 +0200
committerBjörn Gustavsson <[email protected]>2015-04-22 10:14:55 +0200
commitde9c0ab5295fb0a16b05c4df101074ce9cd6695b (patch)
treeb10c3ace7daaf59047d77fada92195c3272d6166 /lib/compiler/src/beam_flatten.erl
parent68fdf06841859afc4de3ccdc26fac7b78e8b47db (diff)
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beam_type: Eliminate redundant calls to checkerror_1/2
Profiling shows that the excution time for checkerror_1/2 could be be near the top even for modules without any floating point operations. It turns out that the complexity of simplify_float_1/4 is quadratic. checkerror/1 is called with the growing accumulator for each iteration. checkerror/1 will traverse the entire accumulated list *unless* some floating point operations are used. We can avoid this situation if we only call checkerror/1 when there are live floating point registers. We can also avoid calling flush/3 if there are no live floating point registers.
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