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Revert "i965/fs: Reduce restrictions on interference in register coalescing."

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This reverts commit f770123f58.

Cc: "10.2" <mesa-stable@lists.freedesktop.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=78692
(cherry picked from commit ccb1ea8a15)
This commit is contained in:
Matt Turner 2014-05-26 11:44:09 -07:00 • committed by Ian Romanick
parent 2a29dbdc6e
commit 17c7ead727
1 changed files with 13 additions and 0 deletions
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13
src/mesa/drivers/dri/i965/brw_fs_register_coalesce.cpp
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@ -83,6 +83,19 @@ can_coalesce_vars(brw::fs_live_variables *live_intervals,
if (!live_intervals->vars_interfere(var_from, var_to))
return true;
/* We know that the live ranges of A (var_from) and B (var_to)
* interfere because of the ->vars_interfere() call above. If the end
* of B's live range is after the end of A's range, then we know two
* things:
* - the start of B's live range must be in A's live range (since we
* already know the two ranges interfere, this is the only remaining
* possibility)
* - the interference isn't of the form we're looking for (where B is
* entirely inside A)
*/
if (live_intervals->end[var_to] > live_intervals->end[var_from])
return false;
assert(ip >= live_intervals->start[var_to]);
fs_inst *scan_inst;