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| author | Ahmed Bougacha <ahmed.bougacha@gmail.com> | 2015-04-17 22:20:57 +0000 |
|---|---|---|
| committer | Ahmed Bougacha <ahmed.bougacha@gmail.com> | 2015-04-17 22:20:57 +0000 |
| commit | 83f78a459a28705a2df8181d68cbfeaf4a30c0e0 (patch) | |
| tree | a6a88e4905113d7d24eae675bbee33e689ceff9e /llvm/lib/MC/MCStreamer.cpp | |
| parent | 635b509dee6aa29a1524fa76aacf418a44448c77 (diff) | |
| download | bcm5719-llvm-83f78a459a28705a2df8181d68cbfeaf4a30c0e0.tar.gz bcm5719-llvm-83f78a459a28705a2df8181d68cbfeaf4a30c0e0.zip | |
[MemCpyOpt] Optimize double-storing by memset+memcpy.
A common idiom in some code is to do the following:
memset(dst, 0, dst_size);
memcpy(dst, src, src_size);
Some of the memset is redundant; instead, we can do:
memcpy(dst, src, src_size);
memset(dst + src_size, 0,
dst_size <= src_size ? 0 : dst_size - src_size);
Original patch by: Joel Jones
Differential Revision: http://reviews.llvm.org/D498
llvm-svn: 235232
Diffstat (limited to 'llvm/lib/MC/MCStreamer.cpp')
0 files changed, 0 insertions, 0 deletions
