The FPU registers test detects stuck-at faults in the FPU by using the checkerboard test.
This test ensures that the bits in the registers are not stuck at value '0' or '1'. The test performs the following major tasks:
1) The registers are tested by performing a write/read/compare test sequence using a
checkerboard pattern (0x5555 5555, then 0xaaaa aaaaa). These binary sequences are
valid floating point values.
2) The test returns an error code if the returned values do not match.
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