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RSQRSP Single-Precision Floating-Point Square-Root Reciprocal Approximation
3-204 Instruction Set SPRU733
Note:
1) If src2 is SNaN, NaN_out is placed in dst and the INVAL and NAN2 bits
are set.
2) If src2 is QNaN, NaN_out is placed in dst and the NAN2 bit is set.
3) If src2 is a negative, nonzero, nondenormalized number, NaN_out is
placed in dst and the INVAL bit is set.
4) If src2 is a signed denormalized number, signed infinity is placed in dst
and the DIV0, INEX, and DEN2 bits are set.
5) If src2 is signed 0, signed infinity is placed in dst and the DIV0 and INFO
bits are set. The Newton-Rhapson approximation cannot be used to
calculate the square root of 0 because infinity multiplied by 0 is invalid.
6) If src2 is positive infinity, positive 0 is placed in dst.
Pipeline
Stage
E1
Read src2
Written dst
Unit in use
.S
Instruction Type Single-cycle
Delay Slots 0
Functional Unit
Latency
1
See Also RCPSP, RSQRDP
Example 1
RSQRSP .S1 A1,A2
Before instruction 1 cycle after instruction
A1
4080 0000h
4.0 A1 4080 0000h 4.0
A2 xxxx xxxxh A2 3F00 0000h 0.5
Example 2 RSQRSP .S2X A1,B2
Before instruction 1 cycle after instruction
A1
4109 999Ah
8.6 A1 4109 999Ah 8.6
B2 xxxx xxxxh B2 3EAE 8000h 0.34082031
Pipeline