Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 1019

fpnma
fpnma — Floating-point Parallel Negative Multiply Add
( ) fpnma.
Format: qp
The pair of products of the pairs of single precision values in the significand fields of FR
Description:
and FR
f f
3
precision values in the significand field of FR
again in infinite precision. The resulting values are then rounded to single precision
using the rounding mode specified by FPSR.sf.rc. The pair of rounded results are stored
in the significand field of FR
63
for 2.0 (0x1003E) and the sign field of FR
If any of FR
result.
Note: If
product being negated before rounding) is performed.
The mnemonic values for sf are given in
The encodings and interpretation for the status field's rc are given in
page 1:90.
3:120
= , ,
sf f f f f
1 3 4 2
are computed to infinite precision, negated, and then the pair of single
4
. The exponent field of FR
f
1
, FR , or FR is a NaTVal, FR
f f f
3 4 2
is f0 in the fpnma instruction, just the IEEE multiply operation (with the
f
2
are added to these (negated) products,
f
2
is set to the biased exponent
f
1
is set to positive (0).
f
1
is set to NaTVal instead of the computed
f
1
Table 2-23 on page 3:56.
Volume 3: Instruction Reference
F1
Table 5-6 on