VRECPE (Vector Reciprocal Estimate) finds an
approximate reciprocal of each element in a vector, and places the
results in a second vector.
VRSQRTE (Vector Reciprocal Square Root Estimate)
finds an approximate reciprocal square root of each element in a
vector, and places the results in a second vector.
SyntaxVop{cond}.datatypeQd,Qm
Vop{cond}.datatypeDd,Dm
where:
opmust be either
RECPEorRSQRTE.condis an optional condition code.
datatypemust be either
U32orF32.Qd,Qmare the destination vector and the operand vector, for a quadword operation.
Dd,Dmare the destination vector and the operand vector, for a doubleword operation.
Table 24 shows the results where input values are out of range.
Table 24. Results for out-of-range inputs
Operand element (VRECPE) | Operand element (VRSQRTE) | Result element | |
|---|---|---|---|
| Integer | <= 0x7FFFFFFF | <= 0x3FFFFFFF | 0xFFFFFFFF |
| Floating-point | NaN | NaN, Negative Normal, Negative Infinity | Default NaN |
| Negative 0, Negative Denormal | Negative 0, Negative Denormal | Negative Infinity [a] | |
| Positive 0, Positive Denormal | Positive 0, Positive Denormal | Positive Infinity [a] | |
| Positive infinity | Positive infinity | Positive 0 | |
| Negative infinity | Negative 0 | ||
[a] The Division by Zero exception bit in the FPSCR (FPSCR[1]) is set | |||
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