From: "Jose E. Marchesi" <jemarch@gnu.org>
To: "Guillermo E. Martinez via Cgen" <cgen@sourceware.org>
Subject: Re: [PATCH CGEN v1] cgen: Compute correct mask and values when offset in define-ifield is not 0.
Date: Tue, 14 Sep 2021 23:34:09 +0200 [thread overview]
Message-ID: <87v932suy6.fsf@gnu.org> (raw)
In-Reply-To: <20210820023254.2575757-1-guillermo.e.martinez@oracle.com> (Guillermo E. Martinez via Cgen's message of "Thu, 19 Aug 2021 21:32:54 -0500")
Hi Guillermo.
> diff --git a/utils.scm b/utils.scm
> index 29b72ff..3573eff 100644
> --- a/utils.scm
> +++ b/utils.scm
> @@ -804,14 +804,14 @@
> ; Otherwise START denotes the most significant bit.
> ; N is assumed to fit in the field.
>
> -(define (word-value start length size lsb0? start-lsb? value)
> +(define (word-value start length size offset lsb0? start-lsb? value)
> (if lsb0?
> (if start-lsb?
> (logsll value start)
> - (logsll value (+ (- start length) 1)))
> + (logsll value (+ (- start length) offset 1)))
> (if start-lsb?
> (logsll value (- size start 1))
> - (logsll value (- size (+ start length)))))
> + (logsll value (- size (+ start length offset)))))
> )
>
> ; Return a bit mask of LENGTH bits in a word of SIZE bits starting at START.
> @@ -820,14 +820,14 @@
> ; START-LSB? is non-#f if START denotes the least significant bit.
> ; Otherwise START denotes the most significant bit.
>
> -(define (word-mask start length size lsb0? start-lsb?)
> +(define (word-mask start length size offset lsb0? start-lsb?)
> (if lsb0?
> (if start-lsb?
> (logsll (mask length) start)
> - (logsll (mask length) (+ (- start length) 1)))
> + (logsll (mask length) (+ (- start length) offset 1)))
> (if start-lsb?
> (logsll (mask length) (- size start 1))
> - (logsll (mask length) (- size (+ start length)))))
> + (logsll (mask length) (- size (+ start length offset)))))
> )
>
> ; Extract LENGTH bits at bit number START in a word of SIZE bits from VALUE.
I just noticed that you forgot to add entries for OFFSET to the comment
blocks of word-value and word-mask.
next prev parent reply other threads:[~2021-09-14 21:34 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-20 2:32 Guillermo E. Martinez
2021-09-02 13:22 ` Guillermo Martinez
2021-09-10 1:23 ` Frank Ch. Eigler
2021-09-10 2:29 ` Jose E. Marchesi
2021-09-10 2:36 ` Jose E. Marchesi
2021-09-14 21:34 ` Jose E. Marchesi [this message]
2021-09-15 16:32 ` [PATCH v2] " Guillermo E. Martinez
2021-09-15 16:49 ` Jose E. Marchesi
2021-09-15 18:04 ` Guillermo Martinez
2021-11-25 23:02 ` Alan Modra
2021-11-25 23:28 ` Guillermo Martinez
2021-11-26 0:46 ` Alan Modra
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