Power ISA™ Version 2.03 - Power.org

Version 2.03
Vector Multiply Word Low Unsigned,
Saturate, Integer and Accumulate into
Words
EVX-form
evmwlusiaaw RT,RA,RB
4 RT RA RB 1344
0 6 11 16 21 31
Vector Multiply Word Low Unsigned,
Saturate, Integer and Accumulate
Negative in Words
EVX-form
evmwlusianw RT,RA,RB
4 RT RA RB 1472
0 6 11 16 21 31
temp 0:63 (RA) 0:31 × ui (RB) 0:31
temp 0:63 EXTZ((ACC) 0:31 ) + EXTZ(temp 32:63 )
ovh temp 31
RT 0:31 SATURATE(ovh, 0, 0xFFFF_FFFF, 0xFFFF_FFFF,
temp 32:63 )
temp 0:63 (RA) 32:63 × ui (RB) 32:63
temp 0:63 EXTZ((ACC) 32:63 ) + EXTZ(temp 32:63 )
ovl temp 31
RT 32:63 SATURATE(ovl, 0, 0xFFFF_FFFF,
0xFFFF_FFFF, temp 32:63 )
ACC 0:63 (RT) 0:63
SPEFSCR OVH ovh
SPEFSCR OV ovl
SPEFSCR SOVH SPEFSCR SOVH | ovh
SPEFSCR SOV SPEFSCR SOV | ovl
For each word element in the accumulator, corresponding
word unsigned-integer elements in RA and RB are
multiplied producing a 64-bit product. The least significant
32 bits of each product are then added to the corresponding
word in the accumulator saturating if
overflow occurs, and the result is placed in RT and the
accumulator.
Special Registers Altered:
ACC, OV, OVH, SOV, SOVH
temp 0:63 (RA) 0:31 × ui (RB) 0:31
temp 0:63 EXTZ((ACC) 0:31 ) - EXTZ(temp 32:63 )
ovh temp 31
RT 0:31 SATURATE(ovh, 0, 0x0000_0000, 0x0000_0000,
temp 32:63 )
temp 0:63 (RA) 32:63 × ui (RB) 32:63
temp 0:63 EXTZ((ACC) 32:63 ) - EXTZ(temp 32:63 )
ovl temp 31
RT 32:63 SATURATE(ovl, 0, 0x0000_0000,
0x0000_0000, temp 32:63 )
ACC 0:63 (RT) 0:63
SPEFSCR OVH ovh
SPEFSCR OV ovl
SPEFSCR SOVH SPEFSCR SOVH | ovh
SPEFSCR SOV SPEFSCR SOV | ovl
For each word element in the accumulator, corresponding
word unsigned-integer elements in RA and RB are
multiplied producing a 64-bit product. The least significant
32 bits of each product are then subtracted from
the corresponding word in the accumulator saturating if
overflow occurs, and the result is placed in RT and the
accumulator.
Special Registers Altered:
ACC, OV, OVH, SOV, SOVH
Vector Multiply Word Signed, Modulo,
Fractional
EVX-form
Vector Multiply Word Signed, Modulo,
Fractional to Accumulator EVX-form
evmwsmf
RT,RA,RB
evmwsmfa
RT,RA,RB
4 RT RA RB 1115
0 6 11 16 21 31
4 RT RA RB 1147
0 6 11 16 21 31
RT 0:63 (RA) 32:63 × sf (RB) 32:63
The corresponding low word signed fractional elements
in RA and RB are multiplied. The product is placed in
RT.
Special Registers Altered:
None
RT 0:63 (RA) 32:63 × sf (RB) 32:63
ACC 0:63 (RT) 0:63
The corresponding low word signed fractional elements
in RA and RB are multiplied. The product is placed in
RT and into the accumulator.
Special Registers Altered:
ACC
Chapter 6. Signal Processing Engine (SPE)
235