RE: timing of lexical analysis in -ftime-report

["Brandon L Hewitt" <blhewitt at attbi dot com>]

Zack, Neil,

Thanks for the quick response.  I understand better what's going on.

Brandon

-----Original Message-----
From: Neil Booth [mailto:neil at daikokuya dot co dot uk]
Sent: Monday, March 17, 2003 12:33 PM
To: Zack Weinberg
Subject: Re: timing of lexical analysis in -ftime-report


Zack Weinberg wrote:-

> The primary function is indeed to give a starting point for
> performance comparisons of different sections of gcc.  But we do
> intend the names of the different passes to reflect what they are
> called in compiler theory, because that makes it easier to understand.
> 
> For C and its descendants, it happens that the preprocessor has to do
> almost all the work of lexical analysis, and there's no point in doing
> it twice.  Thus, the majority of time performing lexical analysis
> happens under TV_CPP.  If you were to look at, say, Fortran source
> code you would find that lexical analysis is attributed to TV_LEX,
> since that language does not use the C preprocessor.

For CPP it's historical baggage; we might try and eliminate TV_LEX
for C family.

Neil.