PNX1300 Philips, PNX1300 Datasheet - Page 416

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

Philips Semiconductors
Signed multiply, return most-significant 32 bits
SYNTAX
FUNCTION
DESCRIPTION
the full 64-bit product into rdest. The operands are considered signed integers.
modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not changed.
EXAMPLES
r60 = 0x10000
r10 = 0, r60 = 0x100, r30 = 0xf11
r20 = 1, r60 = 0x10001000,
r30 = 0xf1100000
r70 = 0xffffff00, r40 = 0x64
As shown below, the
The
[ IF rguard ] imulm rsrc1 rsrc2
if rguard then
rsrc1
temp
rdest
64-bit result
31
imulm
Initial Values
(sign_ext32to64(rsrc1)
temp<63:32>
63
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
imulm
signed
operation computes the product rsrc1 rsrc2 and writes the most-significant 32 bits of
rdest
sign_ext32to64(rsrc2))
imulm r60 r60
IF r10 imulm r60 r30
IF r20 imulm r60 r30
imulm r70 r40
31
rdest
0
Operation
signed
signed
r80
r100
31
PRELIMINARY SPECIFICATION
rsrc2
31
r50
r90
PNX1300/01/02/11 DSPCPU Operations
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
r80
no change, since guard is false
r90
r100
dspidualmul quadumulmsb
umulm dspimul dspumul
signed
0x00000001
0xff10ff11
0xffffffff
ATTRIBUTES
SEE ALSO
Result
fmul
0
imulm
ifmul
139
2, 3
No
—
0
2
3
A-118