YREGS * Define register names ... SAVESTAT IPM R2 * Save current status * * Now that PSW status has been saved, we can change the program mask: * Bit 0 = 0 to ignore fixed point overflow conditions * Bit 1 = 0 to ignore decimal overflow exceptions * Bit 2 = 1 to catch HFP exponent underflow * Bit 3 = 1 to catch HFP significance exceptions * LA R1,X'03' * CC=0, Program Mask=B'0111' SPM R1 * Activate new program mask ... SPM R2 * Restore status to saved state
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