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Date: Wed, 15 Jan 2020 14:18:56 +0000
From: Luís Marques <luismarques@...risc.org>
To: Florian Weimer <fweimer@...hat.com>
Cc: musl@...ts.openwall.com
Subject: Re: [PATCH] Fix RISC-V a_cas inline asm operand sign extension
On Wed, Jan 15, 2020 at 1:50 PM Florian Weimer <fweimer@...hat.com> wrote:
> Are casts in this place really casts, and not merely type assertions?
> I think you have to use a temporarily variable or maybe a redundant +,
> to change the syntax.
AFAIK the expression inside the parenthesis is just a regular C
expression, which in this case is a cast expression of a variable.
Here's what the GCC documentation says for the input operands (section
"6.47.2.5 Input Operands"):
"Each operand has this format: [ [asmSymbolicName] ] constraint (cexpression)
(...)
cexpression
This is the C variable or expression being passed to the asm statement
as input."
Is there a particular reason why you believe this might be a type
assertion instead?
Thanks,
Luís
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