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Akira Hatanaka
f500c76435
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
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