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erlang
2163-beam_asm-Encode-big-numbers-as-literals.patch
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File 2163-beam_asm-Encode-big-numbers-as-literals.patch of Package erlang
From 26e3ec83c54d42d73c42ef7c4e79ae629866faa2 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org> Date: Fri, 26 Jan 2018 10:46:23 +0100 Subject: [PATCH 1/2] beam_asm: Encode big numbers as literals Numbers that clearly are not smalls can be encoded as literals. Conservatively, we assume that integers whose absolute value is greater than 1 bsl 128 are bignums and that they can be encoded as literals. Literals are slightly easier for the loader to handle than huge integers. --- lib/compiler/src/beam_asm.erl | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/lib/compiler/src/beam_asm.erl b/lib/compiler/src/beam_asm.erl index 453e00fce3..fa919ca862 100644 --- a/lib/compiler/src/beam_asm.erl +++ b/lib/compiler/src/beam_asm.erl @@ -407,7 +407,17 @@ encode_arg({atom, Atom}, Dict0) when is_atom(Atom) -> {Index, Dict} = beam_dict:atom(Atom, Dict0), {encode(?tag_a, Index), Dict}; encode_arg({integer, N}, Dict) -> - {encode(?tag_i, N), Dict}; + %% Conservatily assume that all integers whose absolute + %% value is greater than 1 bsl 128 will be bignums in + %% the runtime system. + if + N >= 1 bsl 128 -> + encode_arg({literal, N}, Dict); + N =< -(1 bsl 128) -> + encode_arg({literal, N}, Dict); + true -> + {encode(?tag_i, N), Dict} + end; encode_arg(nil, Dict) -> {encode(?tag_a, 0), Dict}; encode_arg({f, W}, Dict) -> -- 2.16.0
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