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authorDenys Vlasenko <vda.linux@googlemail.com>2018-02-05 00:34:08 +0100
committerDenys Vlasenko <vda.linux@googlemail.com>2018-02-05 00:34:08 +0100
commitc2a51b0cf16918482c993c4998a2a920e499a43f (patch)
treef138a8f9dfc180c60446e682ab4436c3bdfad127 /editors
parentf75a7c04397b8b3409b5c4f5a4438654b6b830ce (diff)
downloadbusybox-c2a51b0cf16918482c993c4998a2a920e499a43f.tar.gz
bzip2: work around bad compiler optimization
gc-6.1.1 x86_64: function old new delta generateMTFValues 380 367 -13 gcc-4.3.1 386: function old new delta inner_loop - 41 +41 generateMTFValues 357 294 -63 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 0/1 up/down: 41/-63) Total: -22 bytes gcc-6.3.0 386: function old new delta inner_loop - 36 +36 generateMTFValues 363 250 -113 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 0/1 up/down: 36/-113) Total: -77 bytes The last case, gcc-6.3.0, runs almost 3 times faster after this change. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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