tree 39ddc77f67f4353ea914a5301ccf1e18f48034bf
parent 06743c1a5bfbb5cb05fc1b108e3b63009a8bb92f
author florian <florian@8f6e269a-dfd6-0310-a8e1-e2731360e62c> 1356569983 +0000
committer florian <florian@8f6e269a-dfd6-0310-a8e1-e2731360e62c> 1356569983 +0000

s390: Do not waste a register when assigning a constant to a memory
location. If available, use MVHI and friends. If those are not available,
load the constant value into register r0 and store that. r0 is not visible
to register allocation and therefore using it does not increase register
pressure.
Remove S390_INSN_MZERO and replace it with S390_INSN_MIMM. Assigning zero
is just a special case..
Saves between 0.9% and 2.4% of insns as measured with the perf regression
bucket.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2619 8f6e269a-dfd6-0310-a8e1-e2731360e62c