efDataDiscreteRateMining standardDeviationMemoryDefinition.c 张婷 commit at 2021-03-30

efDataDiscreteRateMining/dataSharedMemory/standardDeviationMemoryDefinition.c

@@ -306,3 +306,68 @@ static unsigned int PerformComparison(const unsigned int opcode)
 			/* test for less than condition */
 			if (float32_lt_nocheck(rFn, rFm))
 				flags |= CC_NEGATIVE;
+
+			/* test for equal condition */
+			if (float32_eq_nocheck(rFn, rFm))
+				flags |= CC_ZERO;
+
+			/* test for greater than or equal condition */
+			if (float32_lt_nocheck(rFm, rFn))
+				flags |= CC_CARRY;
+		} else {
+			/* Promote 32-bit operand to 64 bits.  */
+			float64 rFm, rFn;
+
+			rFm = (fpa11->fType[Fm] == typeSingle) ?
+			    float32_to_float64(fpa11->fpreg[Fm].fSingle)
+			    : fpa11->fpreg[Fm].fDouble;
+
+			rFn = (fpa11->fType[Fn] == typeSingle) ?
+			    float32_to_float64(fpa11->fpreg[Fn].fSingle)
+			    : fpa11->fpreg[Fn].fDouble;
+
+			if (float64_is_nan(rFn)
+			    || float64_is_nan(rFm))
+				goto unordered;
+
+			if (n_flag)
+				rFm ^= 0x8000000000000000ULL;
+
+			/* test for less than condition */
+			if (float64_lt_nocheck(rFn, rFm))
+				flags |= CC_NEGATIVE;
+
+			/* test for equal condition */
+			if (float64_eq_nocheck(rFn, rFm))
+				flags |= CC_ZERO;
+
+			/* test for greater than or equal condition */
+			if (float64_lt_nocheck(rFm, rFn))
+				flags |= CC_CARRY;
+		}
+	}
+
+#endif
+
+	writeConditionCodes(flags);
+
+	return 1;
+
+      unordered:
+	/* ?? The FPA data sheet is pretty vague about this, in particular
+	   about whether the non-E comparisons can ever raise exceptions.
+	   This implementation is based on a combination of what it says in
+	   the data sheet, observation of how the Acorn emulator actually
+	   behaves (and how programs expect it to) and guesswork.  */
+	flags |= CC_OVERFLOW;
+	flags &= ~(CC_ZERO | CC_NEGATIVE);
+
+	if (BIT_AC & readFPSR())
+		flags |= CC_CARRY;
+
+	if (e_flag)
+		float_raise(float_flag_invalid);
+
+	writeConditionCodes(flags);
+	return 1;
+}