Power ISA™ Version 2.03 - Power.org

Version 2.03
Multiply Accumulate High Halfword to
Word Modulo Signed
XO-form
machhw RT,RA,RB (OE=0 Rc=0)
machhw. RT,RA,RB (OE=0 Rc=1)
machhwo RT,RA,RB (OE=1 Rc=0)
machhwo. RT,RA,RB (OE=1 Rc=1)
4 RT RA RB OE 44 Rc
0 6 11 16 21 22 31
Multiply Accumulate High Halfword to
Word Saturate Signed
XO-form
machhws RT,RA,RB (OE=0 Rc=0)
machhws. RT,RA,RB (OE=0 Rc=1)
machhwso RT,RA,RB (OE=1 Rc=0)
machhwso. RT,RA,RB
(OE=1 Rc=1)
4 RT RA RB OE 108 Rc
0 6 11 16 21 22 31
prod 0:31 (RA) 32:47 × si (RB) 32:47
temp 0:32 prod 0:31 + (RT) 32:63
RT 32:63 temp 1:32
RT 0:31 undefined
The signed-integer halfword in bits 32:47 of register RA
is multiplied by the signed-integer halfword in bits 32:47
of register RB.
The 32-bit signed-integer product is added to the
signed-integer word in bits 32:63 of register RT.
The low-order 32 bits of the sum are placed into bits
32:63 of register RT.
The contents of bits 0:31 of register RT are undefined.
Special Registers Altered:
SO OV
(if OE=1)
CR0
(if Rc=1)
prod 0:31 (RA) 32:47 × si (RB) 32:47
temp 0:32 prod 0:31 + (RT) 32:63
if temp < -2 31 then RT 32:63 0x8000_0000
else if temp > 2 31 -1 then RT 32:63 0x7FFF_FFFF
else RT 32:63 temp 1:32
RT 0:31 undefined
The signed-integer halfword in bits 32:47 of register RA
is multiplied by the signed-integer halfword in bits 32:47
of register RB.
The 32-bit signed-integer product is added to the
signed-integer word in bits 32:63 of register RT.
If the sum is less than -2 31 , then the value 0x8000_0000
is placed into bits 32:63 of register RT.
If the sum is greater than 2 31 -1, then the value
0x7FFF_FFFF is placed into bits 32:63 of register RT.
Otherwise, the sum is placed into bits 32:63 of register
RT.
The contents of bits 0:31 of register RT are undefined.
Special Registers Altered:
SO OV
(if OE=1)
CR0
(if Rc=1)
Chapter 9. Legacy Integer Multiply-Accumulate Instructions
287