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i965/fs: Let register_coalesce_2() eliminate self-moves. 

This is the last thing that register_coalesce() still handled.

total instructions in shared programs: 1561060 -> 1560908 (-0.01%)
instructions in affected programs:     15758 -> 15606 (-0.96%)

Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Matt Turner 2013-11-29 11:28:54 -08:00
parent 8786f381ec
commit 1520ae48b8
1 changed files with 2 additions and 1 deletions
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3
src/mesa/drivers/dri/i965/brw_fs.cpp
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@ -2271,7 +2271,8 @@ fs_visitor::register_coalesce_2()
int var_from = live_intervals->var_from_reg(&inst->src[0]);
int var_to = live_intervals->var_from_reg(&inst->dst);
if (live_intervals->vars_interfere(var_from, var_to))
if (live_intervals->vars_interfere(var_from, var_to) &&
!inst->dst.equals(inst->src[0]))
continue;
int reg_from = inst->src[0].reg;