Intel ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS MANUAL VOLUME 1 REV 2.3 Manual page 1845

RCPPS: Packed Single-FP Reciprocal
Opcode
0F,53,/r
Operation: xmm1[31-0]
xmm1[63-32]
xmm1[95-64]
xmm1[127-96] = approx (1.0/(xmm2/m128[127-96]));
RCPPS returns an approximation of the reciprocal of the SP FP numbers from
Description:
xmm2/m128. The relative error for this approximation is Error, which satisfies:
|Error| <= 1.5x2
General protection exception if not aligned on 16-byte boundary, regardless of
FP Exceptions:
segment.
None.
Numeric Exceptions:
Protected Mode Exceptions:
#GP(0) for an illegal memory operand effective address in the CS, DS, ES, FS or GS
segments; #SS(0) for an illegal address in the SS segment; #PF(fault-code) for a page
fault; #UD if CR0.EM = 1; #NM if TS bit in CR0 is set.
Real Address Mode Exceptions:
Interrupt 13 if any part of the operand would lie outside of the effective address space
from 0 to 0FFFFH; #UD if CR0.EM = 1; #NM if TS bit in CR0 is set.
Virtual 8086 Mode Exceptions:
Same exceptions as in Real Address Mode; #PF(fault-code) for a page fault.
Additional Itanium System Environment Exceptions
Itanium Reg Faults
Itanium Mem Faults VHPT Data Fault, Data TLB Fault, Alternate Data TLB Fault, Data
RCPPS is not affected by the rounding control in MXCSR. Denormal inputs are treated
Comments:
as zeros (of the same sign) and tiny results are always flushed to zero, with the sign of
the operand.
Results are guaranteed not to be tiny, and therefore not flushed to zero, for input
values x which satisfy
|x| <= 1.11111111110100000000000
Volume 4: IA-32 SSE Instruction Reference
Instruction
RCPPS xmm1, xmm2/m128
= approx (1.0/(xmm2/m128[31-0]));
= approx (1.0/(xmm2/m128[63-32]));
= approx (1.0/(xmm2/m128[95-64]));
-12
Disabled FP Register Fault if PSR.dfl is 1, NaT Register
Consumption Fault
Page Not Present Fault, Data NaT Page Consumption Abort, Data
Key Miss Fault, Data Key Permission Fault, Data Access Rights
Fault, Data Access Bit Fault
Description
Return a packed approximation of the reciprocal of
XMM2/Mem.
125
×2
B
4:543