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| H A D | tcg.c | b3a1be87bac3a6aaa59bb88c1410f170dc9b22d5 Tue Oct 30 23:50:15 UTC 2012 Aurelien Jarno <aurelien@aurel32.net> tcg: don't remove op if output needs to be synced to memory
Commit 9c43b68de628a1e2cba556adfb71c17028eb802e do not correctly check
for dead outputs when they need to be synced to memory in case of
half-dead operations.
Fix that by applying the same pattern than for the default case.
Tested-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
9c43b68de628a1e2cba556adfb71c17028eb802e Tue Oct 09 19:53:07 UTC 2012 Aurelien Jarno <aurelien@aurel32.net> tcg: rework liveness analysis
Rework the liveness analysis by tracking temps that need to go back to
memory in addition to dead temps tracking. This allows to mark output
arguments as "need sync", and to synchronize them back to memory as soon
as they are not written anymore. This way even arguments mapping to
globals can be marked as "dead", avoiding moves to a new register when
input and outputs are aliased.
In addition it means that registers are freed as soon as temps are not
used anymore, instead of waiting for a basic block end or an op with side
effects. This reduces register spilling especially on CPUs with few
registers, and spread the mov over all the TB, increasing the
performances on in-order CPUs.
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
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