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erlang
0251-beam_ssa_dead-Lower-the-threshold-for-givi...
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File 0251-beam_ssa_dead-Lower-the-threshold-for-giving-up.patch of Package erlang
From e971d78d450e116d046b67f899ae53a6f718ee09 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org> Date: Mon, 30 Nov 2020 10:06:00 +0100 Subject: [PATCH 1/3] beam_ssa_dead: Lower the threshold for giving up There is a mechanism for giving up a search for a forced label in beam_ssa_dead. Based on the compilation time for this code: https://gist.github.com/josevalim/2c175678a0f85568eb001dcb97024ef5 where the running time for beam_ssa_dead still dominates, it seems prudent to lower the threshold for when the seach should be given up. https://bugs.erlang.org/browse/ERL-1302 --- lib/compiler/src/beam_ssa_dead.erl | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/compiler/src/beam_ssa_dead.erl b/lib/compiler/src/beam_ssa_dead.erl index cf0132ebb1..a62da9dac2 100644 --- a/lib/compiler/src/beam_ssa_dead.erl +++ b/lib/compiler/src/beam_ssa_dead.erl @@ -196,7 +196,7 @@ shortcut_1(L, From, Bs0, UnsetVars0, St) -> %% Try to shortcut this block, branching to a successor. shortcut_2(L, From, Bs, UnsetVars, St) -> case cerl_sets:size(UnsetVars) of - SetSize when SetSize > 128 -> + SetSize when SetSize > 64 -> %% This is an heuristic to limit the search for a forced label %% before it drastically slows down the compiler. Experiments %% with scripts/diffable showed that limits larger than 31 did not -- 2.26.2
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