aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorRasmus Villemoes <linux@rasmusvillemoes.dk>2015-02-10 11:12:21 +0100
committerMohamad Ayyash <mkayyash@google.com>2015-10-05 12:28:21 -0700
commita0e65083d086819f67b7adedd75eeeeb470d60a4 (patch)
tree74bf4cbe8c112897348cfa2e14cdc42a122ce65d
parentf3393206690f6d499047947c4093041e614161e6 (diff)
downloadlinux-linaro-stable-a0e65083d086819f67b7adedd75eeeeb470d60a4.tar.gz
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 <linux@rasmusvillemoes.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--lib/lz4/lz4_decompress.c18
1 files changed, 7 insertions, 11 deletions
diff --git a/lib/lz4/lz4_decompress.c b/lib/lz4/lz4_decompress.c
index f0f5c5c3de12..26cc6029b280 100644
--- a/lib/lz4/lz4_decompress.c
+++ b/lib/lz4/lz4_decompress.c
@@ -47,6 +47,11 @@
#include "lz4defs.h"
+static const int dec32table[] = {0, 3, 2, 3, 0, 0, 0, 0};
+#if LZ4_ARCH64
+static const int dec64table[] = {0, 0, 0, -1, 0, 1, 2, 3};
+#endif
+
static int lz4_uncompress(const char *source, char *dest, int osize)
{
const BYTE *ip = (const BYTE *) source;
@@ -56,10 +61,6 @@ static int lz4_uncompress(const char *source, char *dest, int osize)
BYTE *cpy;
unsigned token;
size_t length;
- size_t dec32table[] = {0, 3, 2, 3, 0, 0, 0, 0};
-#if LZ4_ARCH64
- size_t dec64table[] = {0, 0, 0, -1, 0, 1, 2, 3};
-#endif
while (1) {
@@ -116,7 +117,7 @@ static int lz4_uncompress(const char *source, char *dest, int osize)
/* copy repeated sequence */
if (unlikely((op - ref) < STEPSIZE)) {
#if LZ4_ARCH64
- size_t dec64 = dec64table[op - ref];
+ int dec64 = dec64table[op - ref];
#else
const int dec64 = 0;
#endif
@@ -177,11 +178,6 @@ static int lz4_uncompress_unknownoutputsize(const char *source, char *dest,
BYTE * const oend = op + maxoutputsize;
BYTE *cpy;
- size_t dec32table[] = {0, 3, 2, 3, 0, 0, 0, 0};
-#if LZ4_ARCH64
- size_t dec64table[] = {0, 0, 0, -1, 0, 1, 2, 3};
-#endif
-
/* Main Loop */
while (ip < iend) {
@@ -249,7 +245,7 @@ static int lz4_uncompress_unknownoutputsize(const char *source, char *dest,
/* copy repeated sequence */
if (unlikely((op - ref) < STEPSIZE)) {
#if LZ4_ARCH64
- size_t dec64 = dec64table[op - ref];
+ int dec64 = dec64table[op - ref];
#else
const int dec64 = 0;
#endif