From: Rasmus Villemoes Date: Tue, 10 Feb 2015 10:12:21 +0000 (+0100) Subject: lib/lz4: Pull out constant tables X-Git-Tag: omap-for-v4.2/o2_dc~156^2~3 X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bea2b592fd18eb8ffa3fc4ad380610632d03a38f;p=pandora-kernel.git lib/lz4: Pull out constant tables There's no reason to allocate the dec{32,64}table on the stack; it just wastes a bunch of instructions setting them up and, of course, also consumes quite a bit of stack. Using size_t for such small integers is a little excessive. $ scripts/bloat-o-meter /tmp/built-in.o lib/built-in.o add/remove: 2/2 grow/shrink: 2/0 up/down: 1304/-1548 (-244) function old new delta lz4_decompress_unknownoutputsize 55 718 +663 lz4_decompress 55 632 +577 dec64table - 32 +32 dec32table - 32 +32 lz4_uncompress 747 - -747 lz4_uncompress_unknownoutputsize 801 - -801 The now inlined lz4_uncompress functions used to have a stack footprint of 176 bytes (according to -fstack-usage); their inlinees have increased their stack use from 32 bytes to 48 and 80 bytes, respectively. Signed-off-by: Rasmus Villemoes Signed-off-by: Greg Kroah-Hartman --- Reading git-diff-tree failed