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Re: Is there an error in GCC Internals Manual, chapter 16.4?


Panu-Kristian Poiksalo <poiksalo@gmail.com> writes:

> Chapter 16.4, "RTL Template" in GCC Internals Manual, found at
> https://gcc.gnu.org/onlinedocs/gccint/RTL-Template.html#RTL-Template
> has this to say about match_scratch:
>
> "
> (match_scratch:m n constraint)
>     This expression is also a placeholder for operand number n and
> indicates that operand must be a scratch or reg expression.
>
>     When matching patterns, this is equivalent to
>
>               (match_operand:m n "scratch_operand" pred)
> "
> I'm wondering what is "pred" in this context?

I think it is supposed to be "constraint".  This error is already
present in the first revision of the file.  I have installed this patch
in trunk as obvious.  Thanks for the report.

Andreas.

	* doc/md.texi (RTL Template) [match_scratch]: Correct equivalent
	match_operand expression.

Index: doc/md.texi
===================================================================
--- doc/md.texi	(revision 216440)
+++ doc/md.texi	(working copy)
@@ -297,7 +297,7 @@
 When matching patterns, this is equivalent to
 
 @smallexample
-(match_operand:@var{m} @var{n} "scratch_operand" @var{pred})
+(match_operand:@var{m} @var{n} "scratch_operand" @var{constraint})
 @end smallexample
 
 but, when generating RTL, it produces a (@code{scratch}:@var{m})
-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."


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