Analysis of information sources in references of the Wikipedia article "SPARC" in Vietnamese language version.
IMPL. DEP. #2-V8: An Oracle SPARC Architecture implementation may contain from 72 to 640 general-purpose 64-bit R registers. This corresponds to a grouping of the registers into MAXPGL + 1 sets of global R registers plus a circular stack of N_REG_WINDOWS sets of 16 registers each, known as register windows. The number of register windows present (N_REG_WINDOWS) is implementation dependent, within the range of 3 to 32 (inclusive).
There are four situations, however, when the hardware will not successfully complete a floating-point instruction:... The instruction is not implemented by the hardware (such as ... quad-precision instructions on any SPARC FPU).
