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Re: gas really slow on long lines
- From: Alan Modra <amodra at bigpond dot net dot au>
- To: Anders Waldenborg <anders at 0x63 dot nu>
- Cc: bug-binutils at gnu dot org, binutils at sourceware dot org
- Date: Fri, 24 Aug 2007 13:35:55 +0930
- Subject: Re: gas really slow on long lines
- References: <fak7n5$fip$1@sea.gmane.org>
On Thu, Aug 23, 2007 at 05:05:09PM +0200, Anders Waldenborg wrote:
> So I fired up oprofile and did some profiling. lex_got in tc-i386.c
> turned up as the main offender.
>
> Without any deeper knowledge of the code it seems really stupid that
> lex_got checks until end of line when it is called on each expression
> on a line.
Agreed. Even though I wrote the code in question. :-)
> --- binutils-2.17.orig/gas/config/tc-i386.c 2006-04-07
> 08:40:57.000000000 +0200
> +++ binutils-2.17/gas/config/tc-i386.c 2007-08-23 16:56:42.795755012 +0200
> @@ -3929,7 +3929,7 @@
> return NULL;
>
> for (cp = input_line_pointer; *cp != '@'; cp++)
> - if (is_end_of_line[(unsigned char) *cp])
> + if (is_end_of_line[(unsigned char) *cp] || *cp == ',')
> return NULL;
>
> for (j = 0; j < sizeof (gotrel) / sizeof (gotrel[0]); j++)
I'm applying the following, which fixes a similar problem a little
later as well.
* config/tc-i386.c (lex_got): Don't scan past a comma.
Index: gas/config/tc-i386.c
===================================================================
RCS file: /cvs/src/src/gas/config/tc-i386.c,v
retrieving revision 1.273
diff -u -p -r1.273 tc-i386.c
--- gas/config/tc-i386.c 17 Aug 2007 14:12:43 -0000 1.273
+++ gas/config/tc-i386.c 24 Aug 2007 01:35:02 -0000
@@ -4485,7 +4485,7 @@ lex_got (enum bfd_reloc_code_real *reloc
return NULL;
for (cp = input_line_pointer; *cp != '@'; cp++)
- if (is_end_of_line[(unsigned char) *cp])
+ if (is_end_of_line[(unsigned char) *cp] || *cp == ',')
return NULL;
for (j = 0; j < sizeof (gotrel) / sizeof (gotrel[0]); j++)
@@ -4519,12 +4519,12 @@ lex_got (enum bfd_reloc_code_real *reloc
first = cp - input_line_pointer;
/* The second part goes from after the reloc token until
- (and including) an end_of_line char. Don't use strlen
- here as the end_of_line char may not be a NUL. */
+ (and including) an end_of_line char or comma. */
past_reloc = cp + 1 + len;
- for (cp = past_reloc; !is_end_of_line[(unsigned char) *cp++]; )
- ;
- second = cp - past_reloc;
+ cp = past_reloc;
+ while (!is_end_of_line[(unsigned char) *cp] && *cp != ',')
+ ++cp;
+ second = cp + 1 - past_reloc;
/* Allocate and copy string. The trailing NUL shouldn't
be necessary, but be safe. */
--
Alan Modra
Australia Development Lab, IBM