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Aurelien Jarno
c19f47bf5e
When the same temp is used twice or more as an input argument to a TCG instruction, the dead computation code doesn't recognize the second use as a dead temp. This is because the temp is marked as live in the same loop where dead inputs are checked. The fix is to split the loop in two parts. This avoid emitting a move and using a register for the movcond instruction when used as "move if true" on x86-64. This might bring more improvements on RISC TCG targets which don't have outputs aliased to inputs. Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Message-Id: <1433447228-29425-3-git-send-email-aurelien@aurel32.net> Signed-off-by: Richard Henderson <rth@twiddle.net>
Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org - QEMU team