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* [PowerPC] Improve int_to_fp(fp_to_int(x)) combiningHal Finkel2015-01-061-0/+70
The old target DAG combine that allowed for performing int_to_fp(fp_to_int(x)) without a load/store pair is updated here with support for unsigned integers, and to support single-precision values without a third rounding step, on newer cores with the appropriate instructions. llvm-svn: 225248
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