| commit | c52ab8b42749ca0838380e46cfa35759057abac6 | |
| author | Douglas Katzman <dougk@google.com> | |
| Wed, 5 Apr 2017 17:31:49 +0000 (5 13:31 -0400) | ||
| committer | Douglas Katzman <dougk@google.com> | |
| Wed, 5 Apr 2017 17:31:49 +0000 (5 13:31 -0400) | ||
| tree | 13bb13b26f4cb00c97ff4b4540876cab73608855 | treesnapshot (tar.gz zip) |
| parent | da3769e96716c1b25d8b1d3fde43121283848f0b | commitdiff |
Improve page_mumble_p() predicates.
* Placing the 'allocated' field first avoids a shift for most uses,
whereas 1-bit fields tend to be efficiently testable wherever.
* Not all C compilers are not smart enough to turn sequential logic
into combinatorial logic.
It seems clang did better than gcc with things as they were.
But any compiler should generate better code now.
* Placing the 'allocated' field first avoids a shift for most uses,
whereas 1-bit fields tend to be efficiently testable wherever.
* Not all C compilers are not smart enough to turn sequential logic
into combinatorial logic.
It seems clang did better than gcc with things as they were.
But any compiler should generate better code now.
| contrib/sb-introspect/introspect.lisp | diffblobblamehistory | |
| src/runtime/gencgc-internal.h | diffblobblamehistory | |
| src/runtime/gencgc.c | diffblobblamehistory |