dolphin-emu/dolphin — pull request #388 by Tilka (2014-05-22 12:11:08+00:00)
Title: Jit64: use RSQRTSS for frsqrtex

Given that the PPC and x86 manuals specify the same accuracy, the instructions are probably implemented using the same dark magic (see https://en.wikipedia.org/wiki/Fast_inverse_square_root).