631c16855
Denys Vlasenko
2018-01-31
Subject
gzip: optionally faster put_32bit()
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Commit Diff GitHub →
archival/gzip.c+14 -2
| @@ -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); | |
| } | |