a = 0xfff10100(32 bit)-negative b = 0x90001234(32 bit) - negative
x = 0x1234(16 bit)
The basic expression is (a*x)+b
a*x*2 result is fffeef063400 - but only the upper
32 bit result is used
so fffeef06 + 90001234 = ffff8ffdf040
result + b
I do this like this
set prod[expr {((1 << 1) *...
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