Control Register File Extensions
2-33CPU Data Paths and ControlSPRU733
Table 2−16. Floating-Point Multiplier Configuration Register (FMCR)
Field Descriptions (Continued)
Bit DescriptionValueField
15−11 Reserved 0 Reserved. The reserved bit location is always read as 0. A value written to this
field has no effect.
10−9 RMODE 0−3h Rounding mode select for .M1.
0 Round toward nearest representable floating-point number
1h Round toward 0 (truncate)
2h Round toward infinity (round up)
3h Round toward negative infinity (round down)
8
UNDER Result underflow status for .M1.
0 Result does not underflow.
1 Result underflows.
7
INEX Inexact results status for .M1.
0
1 Result differs from what would have been computed had the exponent range
and precision been unbounded; never set with INVAL.
6
OVER Result overflow status for .M1.
0 Result does not overflow.
1 Result overflows.
5
INFO Signed infinity for .M1.
0 Result is not signed infinity.
1 Result is signed infinity.
4
INVAL
0 A signed NaN (SNaN) is not a source.
1 A signed NaN (SNaN) is a source. NaN is a source in a floating-point to integer
conversion or when infinity is subtracted from infinity.
3
DEN2 Denormalized number select for .M1 src2.
0 src2 is not a denormalized number.
1 src2 is a denormalized number.
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