Akira Hatanaka 0b2fa914f0 This patch eliminates redundant instructions that produce 0.
For example, the first instruction in the code below can be eliminated if the
use of $vr0 is replaced with $zero: 

addiu $vr0, $zero, 0
add $vr2, $vr1, $vr0

add $vr2, $vr1, $zero

llvm-svn: 152280
2012-03-08 01:51:59 +00:00
..
2012-02-28 07:46:26 +00:00