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cpplex.c (_cpp_clean_line): In the common case of a line with no trigraphs and no \-newline...

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* cpplex.c (_cpp_clean_line): In the common case of a line
	with no trigraphs and no \-newline, avoid writing to memory.
	(_cpp_skip_block_comment): Use a local 'cur' pointer instead
	of the buffer member.  Make c an uchar to avoid unnecessary
	sign extensions.

From-SVN: r72437
This commit is contained in:
Zack Weinberg 2003-10-13 18:53:28 +00:00
parent b1ef58c8fa
commit d08dcf87c3
2 changed files with 83 additions and 18 deletions
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18
gcc/ChangeLog
View File

@ -1,3 +1,11 @@
2003-10-13 Zack Weinberg <zack@codesourcery.com>
* cpplex.c (_cpp_clean_line): In the common case of a line
with no trigraphs and no \-newline, avoid writing to memory.
(_cpp_skip_block_comment): Use a local 'cur' pointer instead
of the buffer member. Make c an uchar to avoid unnecessary
sign extensions.
2003-10-13 Nathanael Nerode <neroden@gcc.gnu.org>
* configure.in: Remove unnecessary test.
@ -9,13 +17,13 @@
2003-10-13 Andreas Krebbel <krebbel1@de.ibm.com>
* config/s390/s390.md ("*fmadddf4", "*fmsubdf4", "*fmaddsf4",
* config/s390/s390.md ("*fmadddf4", "*fmsubdf4", "*fmaddsf4",
"*fmsubsf4"): Insns are now dependent on TARGET_FUSED_MADD instead
of flag_unsafe_math_optimizations.
* config/s390/s390.h ("MASK_NO_FUSED_MADD", "TARGET_NO_FUSED_MADD",
"TARGET_FUSED_MADD", "TARGET_SWITCHES"): Introduced new target flags
fused-madd and no-fused-madd.
* doc/invoke.texi: Documented the new options fused-madd and
* doc/invoke.texi: Documented the new options fused-madd and
no-fused-madd for S/390.
2003-10-14 Alan Modra <amodra@bigpond.net.au>
@ -123,7 +131,7 @@
and the signed type would overflow. Always negate real constants
unless we honor -ftrapping-math. Only convert -(A-B) into B-A
if allowed by reorder_operands_p. Add support for COMPLEX_CST.
Optimize negation through floating point extensions and
Optimize negation through floating point extensions and
sign-preserving built-in functions (as defined by negate_mathfn_p).
(fold): Adjust calls to tree_swap_operands_p.
(fold <NEGATE_EXPR>): Move the remaining negation optimizations
@ -226,7 +234,7 @@ Sat Oct 11 12:24:23 CEST 2003 Jan Hubicka <jh@suse.cz>
point optimizations with -funsafe-math-optimizations.
2003-10-11 Andrew Pinski <pinskia@physics.uc.edu>
* genmodes.c (emit_mode_mask) Change MASK to MODE_MASK.
2003-10-11 Kazu Hirata <kazu@cs.umass.edu>
@ -298,7 +306,7 @@ Sat Oct 11 12:24:23 CEST 2003 Jan Hubicka <jh@suse.cz>
Paul Dale <pauli@snapgear.com>
* config/m68k/lb1sf68.asm: Add __PIC__ and __ID_SHARED_LIBRARY__
support.
support.
* config/m68k/m68k-none.h (ASM_SPEC): Pass --pcrel to assembler on
-fpic, -fPIC, -msep-data and -mid-shared-library.
* config/m68k/m68k.c (m68k_library_id_string): New global variable.

83
gcc/cpplex.c
View File

@ -114,7 +114,57 @@ _cpp_clean_line (cpp_reader *pfile)
if (!buffer->from_stage3)
{
d = (uchar *) s;
/* Short circuit for the common case of an un-escaped line with
no trigraphs. The primary win here is by not writing any
data back to memory until we have to. */
for (;;)
{
c = *++s;
if (c == '\n' || c == '\r')
{
d = (uchar *) s;
if (s == buffer->rlimit)
goto done;
/* DOS line ending? */
if (c == '\r' && s[1] == '\n')
s++;
if (s == buffer->rlimit)
goto done;
/* check for escaped newline */
p = d;
while (p != buffer->next_line && is_nvspace (p[-1]))
p--;
if (p == buffer->next_line || p[-1] != '\\')
goto done;
/* Have an escaped newline; process it and proceed to
the slow path. */
add_line_note (buffer, p - 1, p != d ? ' ' : '\\');
d = p - 2;
buffer->next_line = p - 1;
break;
}
if (c == '?' && s[1] == '?' && _cpp_trigraph_map[s[2]])
{
/* Have a trigraph. We may or may not have to convert
it. Add a line note regardless, for -Wtrigraphs. */
add_line_note (buffer, s, s[2]);
if (CPP_OPTION (pfile, trigraphs))
{
/* We do, and that means we have to switch to the
slow path. */
d = (uchar *) s;
*d = _cpp_trigraph_map[s[2]];
s += 2;
break;
}
}
}
for (;;)
{
@ -164,6 +214,7 @@ _cpp_clean_line (cpp_reader *pfile)
s++;
}
done:
*d = '\n';
/* A sentinel note that should never be processed. */
add_line_note (buffer, d + 1, '\n');
@ -266,43 +317,49 @@ bool
_cpp_skip_block_comment (cpp_reader *pfile)
{
cpp_buffer *buffer = pfile->buffer;
cppchar_t c;
const uchar *cur = buffer->cur;
uchar c;
buffer->cur++;
if (*buffer->cur == '/')
buffer->cur++;
cur++;
if (*cur == '/')
cur++;
for (;;)
{
c = *buffer->cur++;
/* People like decorating comments with '*', so check for '/'
instead for efficiency. */
c = *cur++;
if (c == '/')
{
if (buffer->cur[-2] == '*')
if (cur[-2] == '*')
break;
/* Warn about potential nested comments, but not if the '/'
comes immediately before the true comment delimiter.
Don't bother to get it right across escaped newlines. */
if (CPP_OPTION (pfile, warn_comments)
&& buffer->cur[0] == '*' && buffer->cur[1] != '/')
cpp_error_with_line (pfile, DL_WARNING,
pfile->line, CPP_BUF_COL (buffer),
"\"/*\" within comment");
&& cur[0] == '*' && cur[1] != '/')
{
buffer->cur = cur;
cpp_error_with_line (pfile, DL_WARNING,
pfile->line, CPP_BUF_COL (buffer),
"\"/*\" within comment");
}
}
else if (c == '\n')
{
buffer->cur--;
buffer->cur = cur - 1;
_cpp_process_line_notes (pfile, true);
if (buffer->next_line >= buffer->rlimit)
return true;
_cpp_clean_line (pfile);
pfile->line++;
cur = buffer->cur;
}
}
buffer->cur = cur;
_cpp_process_line_notes (pfile, true);
return false;
}