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9- 46 M68040 USER’S MANUAL MOTOROLA
Table 9-16. State Frame Field Information (Continued)
FSAVE State
Frame Field Contents
OVFL (FMOVE to Memory)
CMDREG1B FMOVE instruction command word
FPTEMP Intermediate result with mantissa rounded to correct precision.
STAG Source Operand Tag = Normalized
E1 Always 1
T Always 1
UNFL (FMOVE to Register, FABS, and FNEG)
CMDREG1B Exception Instruction Command Word
FPTEMP Unrounded, Extended-Precision Intermediate Result
STAG Source Operand Tag = Normalized
E1 Always 1
T Always 0
UNFL (FADD, FSUB, FMUL, FDIV, and FSQRT)
CMDREG3B Encoded Exception Instruction Command Word
WBTEMP WBTS, WBTE, and WBTM = intermediate result sign, biased 15-bit
exponent, and 64-bit mantissa prior to rounding.
WBTE15 Bit 15 of the intermediate result's 16-bit exponent = 1 for underflow.
WBTM1, WBTM0,
SBIT
Guard, round, and sticky of intermediate result’s 67-bit mantissa.
E3 Always 1
T Either 1 or 0
UNFL (FMOVE to Memory)
CMDREG1B FMOVE Instruction Command Word
FPTEMP Intermediate result with mantissa prior to rounding.
STAG Source Operand Tag = Normalized
E1 Always 1
T Always 1
DZ
CMDREG1B M68040FPSP divide by zero can generate.
ETEMP Source operand is converted to extended precision.
STAG Source Operand Tag
FPTEMP Destination operand is converted to extended precision.
E1 Always 1
T Always 0
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