Hardware Oddity RCC Boundaries

RCC boundary values

Evidence: NVIDIA vertex-program specification, not yet an Xbox bitwise measurement. The NV_vertex_program1_1 specification defines RCC as a clamped reciprocal, not merely 1/x. It bounds signed magnitudes between 2^-64 and 2^64, including signed-zero behavior.

Input	Specified RCC result
+0	+2^64
-0	-2^64
+infinity	+2^-64
-infinity	-2^-64

The binary32 boundary words are 0x5F800000 and 0x1F800000, with sign-bit counterparts. Use these bits rather than rounded decimal approximations.

Proposed test: compare exact input/output words for signed zeros, infinities, subnormals, NaNs, and adjacent representable values on NV2A. Record exception behavior independently of ordinary finite reciprocal quality.

See also NV2A Graphics Architecture.