PNX1300 Philips, PNX1300 Datasheet - Page 415

• Manufacturer Part Number: PNX1300
• Description: Media Processors
• Manufacturer: Philips

PNX1300/01/02/11 Data Book
imul
SYNTAX
FUNCTION
DESCRIPTION
full 64-bit product into rdest. The operands are considered signed integers. No overflow or underflow detection is
performed.
modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not changed.
EXAMPLES
A-117
r60 = 0x100
r10 = 0, r60 = 0x100, r30 = 0xf11
r20 = 1, r60 = 0x100, r30 = 0xf11
r70 = 0xffffff00, r40 = 0xffffff9c
As shown below, the
The
[ IF rguard ] imul rsrc1 rsrc2
if rguard then
rsrc1
temp
rdest
64-bit result
31
imul
Initial Values
(sign_ext32to64(rsrc1)
temp<31:0>
63
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
imul
PRELIMINARY SPECIFICATION
signed
operation computes the product rsrc1 rsrc2 and writes the least-significant 32 bits of the
rdest
sign_ext32to64(rsrc2))
imul r60 r60
IF r10 imul r60 r30
IF r20 imul r60 r30
imul r70 r40
31
rdest
0
Operation
signed
signed
r80
r100
31
rsrc2
31
r50
r90
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
r80
no change, since guard is false
r90
r100
umul imulm umulm dspimul
signed
dspumul dspidualmul
Philips Semiconductors
0x10000
0xf1100
quadumulmsb fmul
0x6400
Signed multiply
ATTRIBUTES
SEE ALSO
Result
0
ifmul
2, 3
No
27
—
0
2
3