[Vm-dev] Fwd: urgent info required on Slang's shift treatment...

[Eliot Miranda]

forgive the duplication.  I sent to the wrong list first time around.

---------- Forwarded message ----------
From: Eliot Miranda <eliot.miranda at gmail.com>
Date: Tue, Mar 3, 2009 at 11:50 AM
Subject: urgent info required on Slang's shift treatment...
To: Squeak Virtual Machine Development Discussion <
vm-dev at lists.squeakfoundation.org>


Hi All,
    I'm being bitten by Slang's treatment of bitShift: & >>.  In both cases
(generateBitShift:on:indent: & generateShiftRight:on:indent:) Slang
generates an unsigned shift by explicitly casting the shifted expression to
usqInt.  I can understand the benefit of having an unsigned shift.  But
there are times when one really needs a signed shift.  Further, the
Smalltalk versions of both bitShift: and >> are signed shifts.

Dare I change e.g. generateShiftRight:on:indent: to leave the expression
alone and generate either a signed or an unsigned shift based on the
variable's declaration?  Or must I live with a maddening cCode: '(signed)'
inSmalltalk: [] carbuncle?

E.
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