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68a5fc55d2
The interpreter implementation of fctiwx was treating rounding mode 0 as "round to nearest, ties towards zero", which is not an actual IEEE-754 rounding mode. The IBM document mentioned in a comment at the top of the function, on the other hand, treats rounding mode 0 as "round to nearest, ties to even", which makes more sense. This fixes one of JMC's console-recorded F-Zero GX replays on JitArm64. (JitArm64 uses an interpreter fallback for fctiwx.)