*IBM may consider it worthwhile to extend these two instructions to
v3.1 Prefixed (`pfmvis` and `pfrlsi`). If so it is recommended that
-`pfmvis` load a full FP32 immediate and `pfrlsi` supplies the four high
-missing exponent bits (8 to 10) and the lower additional
-28 mantissa bits (23 to 51) needed to construct a full FP64 immediate.*
+`pfmvis` load a full FP32 immediate and `pfrlsi` supplies the three high
+missing exponent bits (numbered 8 to 10) and the lower additional
+29 mantissa bits (23 to 51) needed to construct a full FP64 immediate.*
## Load BF16 Immediate
Strategically similar to how `oris` is used to construct
32-bit Integers, an additional 16-bits of immediate is
inserted into `FRS` to extend its accuracy to
-a full FP32. If a prior `fmvis` instruction had been used to
+a full FP32 (stored as usual in FP64 Format within the FPR).
+If a prior `fmvis` instruction had been used to
set the upper 16-bits of an FP32 value, `frlsi` contains the
lower 16-bits.
The key difference between using `li` and `oris` to construct 32-bit
GPR Immediates and `frlsi` is that the `fmvis` will have converted
-the `BF16` to FP64 (Double) format. This is taken into consideration
-as can be seen in the pseudocode below
+the `BF16` immediate to FP64 (Double) format.
+This is taken into consideration
+as can be seen in the pseudocode below.
Pseudocode: