tree aaa40ee8118660e5e61e8f844102514539da4543
parent 118ca7981db7443ef3cd6247e699799548cd883a
author Jim Stichnoth <stichnot@chromium.org> 1412120978 -0700
committer Jim Stichnoth <stichnot@chromium.org> 1412120978 -0700

Subzero: Rewrite the pass timing infrastructure.

This makes it much more useful for individual analysis and long-term translation performance tracking.

1. Collect and report aggregated across the entire translation, instead of function-by-function.  If you really care about a single function, just extract it and translate it separately for analysis.

2. Remove "-verbose time" and just use -timing.

3. Collects two kinds of timings: cumulative and flat.  Cumulative measures the total time, even if a callee also times itself.  Flat only measures the currently active timer at the top of the stack.  The flat times should add up to 100%, but cumulative will usually add up to much more than 100%.

BUG= none
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/610813002