| commit | cd728cce9133035e0fd5b8f8d71bdd3ce4b984ad | |
| author | Mark Williams <mwilliams@fb.com> | |
| Fri, 10 Mar 2017 23:23:51 +0000 (10 15:23 -0800) | ||
| committer | Hhvm Bot <hhvm-bot@users.noreply.github.com> | |
| Fri, 10 Mar 2017 23:40:55 +0000 (10 15:40 -0800) | ||
| tree | 67c84c758d12f8aaff9563e69a4e9a32fbd78ec0 | treesnapshot (tar.gz zip) |
| parent | c6536517adc59399453814deb1906f94d4147f7b | commitdiff |
Optimize no-op conditional jumps
Summary:
If a conditional branch branches around a block, and we optimize away
the contents of the block, we end up with a branch around a block
containing a single nop (hhbbc doesn't allow empty blocks).
This follows "nop" blocks at the fallthrough and target, and if they
end up at the same place, eliminates the jmp.
Reviewed By: ricklavoie
Differential Revision: D4689119
fbshipit-source-id: 5df824a31b597513859278ee17eabc5a6fe96928
Summary:
If a conditional branch branches around a block, and we optimize away
the contents of the block, we end up with a branch around a block
containing a single nop (hhbbc doesn't allow empty blocks).
This follows "nop" blocks at the fallthrough and target, and if they
end up at the same place, eliminates the jmp.
Reviewed By: ricklavoie
Differential Revision: D4689119
fbshipit-source-id: 5df824a31b597513859278ee17eabc5a6fe96928
| hphp/hhbbc/interp.cpp | diffblobblamehistory |