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authorGravatar Denys Vlasenko <vda.linux@googlemail.com>2018-01-31 00:42:29 +0100
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2018-01-31 00:42:29 +0100
commit631c16855a05f0699149502bba93a3ad8f88608e (patch)
tree6eeb9b56710ae8159d95c234fc98315fb84dbde2 /archival/gzip.c
parentb7dfbbcdaaae5267259e2272b1cdfde6daad44a0 (diff)
downloadbusybox-631c16855a05f0699149502bba93a3ad8f88608e.tar.gz
busybox-631c16855a05f0699149502bba93a3ad8f88608e.tar.bz2
gzip: optionally faster put_32bit()
function old new delta put_32bit 22 55 +33 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'archival/gzip.c')
-rw-r--r--archival/gzip.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/archival/gzip.c b/archival/gzip.c
index 08633d667..5812f4b27 100644
--- a/archival/gzip.c
+++ b/archival/gzip.c
@@ -454,7 +454,7 @@ static void put_16bit(ush w)
if (outcnt < OUTBUFSIZ-2) {
/* Common case */
ush *dst16 = (void*) dst;
- *dst16 = w; /* unalinged LSB 16-bit store */
+ *dst16 = w; /* unaligned LSB 16-bit store */
G1.outcnt = outcnt + 2;
return;
}
@@ -480,6 +480,18 @@ static void put_16bit(ush w)
static void put_32bit(ulg n)
{
+#if CONFIG_GZIP_FAST > 0 \
+ && BB_UNALIGNED_MEMACCESS_OK && BB_LITTLE_ENDIAN
+ unsigned outcnt = G1.outcnt;
+ if (outcnt < OUTBUFSIZ-4) {
+ /* Common case */
+ uch *dst = &G1.outbuf[outcnt];
+ ulg *dst32 = (void*) dst;
+ *dst32 = n; /* unaligned LSB 32-bit store */
+ G1.outcnt = outcnt + 4;
+ return;
+ }
+#endif
put_16bit(n);
put_16bit(n >> 16);
}
@@ -544,7 +556,7 @@ static void send_bits(unsigned value, unsigned length)
*/
value >>= (BUF_SIZE - G1.bi_valid);
if (BUF_SIZE == 32) {
- put_32bit(new_buf); /* maybe unroll to 2*put_16bit()? */
+ put_32bit(new_buf);
} else { /* 16 */
put_16bit(new_buf);
}