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d445e4acdb
Use the zero register directly when possible to avoid an unnecessary register copy and a wasted register at -O0. This also uses integer stores to store a positive floating-point zero. This saves us from materializing the positive zero in a register and then storing it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216617 91177308-0d34-0410-b5e6-96231b3b80d8
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