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when using testfloat the correct format is
input output unknown value
This comment requested by palmer
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I get differnt answers on Rocket and Spike. The Spike answer matches my Intel
machine. This fails when I compute both the single precision and double
precision answer.
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The new RISC-V ISA spec mandates NAN bit patterns. This test checks to make
sure that those bit patterns come out of fsqrt(-1). These pass on both spike
and Rocket.
An additional _DWORD_RESULT version of the FP test macros is added to
facilitate floating-point tests that compare against particular bit patterns.
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