tree 407495f0509ff0f75663015fd659d8fa28190552
parent 9a0168a9ccfa574e67baebe68650a85a18292d30
author Jim Stichnoth <stichnot@chromium.org> 1406216895 -0700
committer Jim Stichnoth <stichnot@chromium.org> 1406216895 -0700

Subzero: Fix a regalloc eviction bug.

We don't need/want to evict an inactive live range when it doesn't
overlap with the live range currently being considered.

This is especially important for Variables representing scratch
registers that are killed by call instructions.  These register
assignments should obviously never be evicted.

Note that the algorithm that computes the min-weight register to evict
doesn't consider inactive and non-overlapping live ranges.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=3903
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/417933004