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Release 1.0, 1 July 2002 F. Chapter B IEEE Std 754-1985 Requirements for SPARC V9 67
TABLE B-6
describes how SPARC64 V behaves when FSR.NS = 1 (nonstandard mode).
TABLE B-6
Nonarithmetic Operations Under FSR.NS = 1
Operations op1= denorm
op2=
denorm UFM NXM DVM NVM Result
FsTOd — Yes — 1 ——NX
0 ——nx, a signed zero
FdTOs — Yes 1 ———
UF
01——NX
0 ——uf + nx, a signed zero
FADDs,
FSUBs,
FADDd,
FSUBd
Yes No
—
1 ——NX
0 ——nx, op2
No Yes 1 ——NX
0 ——nx, op1
Yes Yes 1 ——NX
0 ——nx, a signed zero
FMULs,
FMULd,
FsMULd
Yes —
—
1 ——NX
0 ——nx, a signed zero
— Ye s 1 ——NX
0 nx, a signed zero
FDIVs,
FDIVd
Yes No
—
1 ——NX
0 ——nx, a signed zero
No Yes — 1 — DZ
— 0 — dz, a signed infinity
Yes Yes ——1NV
——0nv, dNaN
1
1. A single precision dNaN is 7FFF.FFFF
16,
and a double precision dNaN is 7FFF.FFFF.FFFF.FFFF
16
.
FSQRTs,
FSQRTd
—
Yes and op2
> 0
—
1 ——NX
0 ——nx, zero
Yes and op2
< 0
——1
NV
——0 nv, dNaN