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Re: [PATCH] gen_lowpart and lvalues
On Thu, Feb 24, 2005 at 04:32:36PM -0700, Roger Sayle wrote:
> 1.1 (law 11-Aug-97): /* Must be a hard reg that's not valid in MODE. */
> 1.1 (law 11-Aug-97): result = gen_lowpart_common (mode, copy_to_reg (x));
Not an lvalue to begin with.
> 1.6 (law 02-Nov-97): else if (GET_CODE (x) == ADDRESSOF)
> 1.6 (law 02-Nov-97): return gen_lowpart (mode, force_reg (GET_MODE (x), x));
Neither is this.
If we don't *start* with an lvalue, then obviously it's ok if the
result isn't an lvalue.
> Everyone is talking about this as if it is somehow a recent change!
Right or wrong, I'd guess that > 50% of all uses of gen_lowpart
expect lvalue semantics. You've simply got to accept that.
r~