diff options
| author | Richard Biener <rguenther@suse.de> | 2013-06-20 11:33:43 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2013-06-20 11:33:43 +0000 |
| commit | d16e9a99f948b7080132e0c4830faa4f0eba712c (patch) | |
| tree | cf9203d5af293ba8f6a3a702432bb6e293e1842b | |
| parent | 937424c1826e89c7618bf220643974e84f91f86a (diff) | |
| download | gcc-d16e9a99f948b7080132e0c4830faa4f0eba712c.zip gcc-d16e9a99f948b7080132e0c4830faa4f0eba712c.tar.gz gcc-d16e9a99f948b7080132e0c4830faa4f0eba712c.tar.bz2 | |
data-streamer-in.c (streamer_read_uhwi): Optimize single byte case...
2013-06-20 Richard Biener <rguenther@suse.de>
* data-streamer-in.c (streamer_read_uhwi): Optimize single
byte case, inline streamer_read_uchar and defer section
overrun check.
From-SVN: r200239
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/data-streamer-in.c | 31 |
2 files changed, 29 insertions, 8 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 249ee28..caf85d1 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,11 @@ 2013-06-20 Richard Biener <rguenther@suse.de> + * data-streamer-in.c (streamer_read_uhwi): Optimize single + byte case, inline streamer_read_uchar and defer section + overrun check. + +2013-06-20 Richard Biener <rguenther@suse.de> + PR tree-optimization/57584 * tree-ssa-loop-niter.c (expand_simple_operations): Avoid including SSA names into the expanded expression that take part in diff --git a/gcc/data-streamer-in.c b/gcc/data-streamer-in.c index e9ceb29..93fe2ff4 100644 --- a/gcc/data-streamer-in.c +++ b/gcc/data-streamer-in.c @@ -120,18 +120,33 @@ bp_unpack_string (struct data_in *data_in, struct bitpack_d *bp) unsigned HOST_WIDE_INT streamer_read_uhwi (struct lto_input_block *ib) { - unsigned HOST_WIDE_INT result = 0; - int shift = 0; + unsigned HOST_WIDE_INT result; + int shift; unsigned HOST_WIDE_INT byte; + unsigned int p = ib->p; + unsigned int len = ib->len; - while (true) + const char *data = ib->data; + result = data[p++]; + if ((result & 0x80) != 0) { - byte = streamer_read_uchar (ib); - result |= (byte & 0x7f) << shift; - shift += 7; - if ((byte & 0x80) == 0) - return result; + result &= 0x7f; + shift = 7; + do + { + byte = data[p++]; + result |= (byte & 0x7f) << shift; + shift += 7; + } + while ((byte & 0x80) != 0); } + + /* We check for section overrun after the fact for performance reason. */ + if (p > len) + lto_section_overrun (ib); + + ib->p = p; + return result; } |