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发信人: tang (独孤九剑), 信区: Linux
标 题: GCC 3.0 New Features（终于等到了）
发信站: 荔园晨风BBS站 (Tue Jun 19 18:11:57 2001), 转信
GCC 3.0 New Features
General Optimizer Improvements:
Basic block reordering pass.
New if-conversion pass with support for conditional (predicated)
execution.
New tail call and sibling call elimination optimizations.
New register renaming pass.
New (experimental) static single assignment (SSA) representation
support.
New dead-code elimination pass implemented using the SSA representation.
Global null pointer test elimination.
Global code hoisting/unification.
More builtins and optimizations for stdio.h, string.h and old BSD
functions, as well as for ISO C99 functions.
New builtin __builtin_expect for giving hints to the branch predictor.
New Languages and Language specific improvements:
The GNU Compiler for the Java(TM) language (GCJ) is now integrated and
supported, including the run-time library containing most common non-GUI
Java classes, a bytecode interpreter, and the Boehm conservative
garbage collector. Many bugs have been fixed. GCJ can compile Java
source or Java bytecodes to either native code or Java class files,
and supports native methods written in either the standard JNI or the
more efficient and convenient CNI.
New C++ ABI. On the IA-64 platform GCC is capable of inter-operating
with other IA-64 compilers.
The new ABI also significantly reduces the size of symbol and debug
information.
New C++ support library and many C++ bug fixes, vastly improving our
conformance to the ISO C++ standard.
New inliner for C++.
Rewritten C preprocessor, integrated into the C, C++ and Objective C
compilers, with very many improvements including ISO C99 support and
improvements to dependency generation.
Support for more ISO C99 features.
Many improvements to support for checking calls to format functions such
as printf and scanf, including support for ISO C99 format features,
extensions from the Single Unix Specification and GNU libc 2.2, checking
of strfmon formats and features to assist in auditing for format string
security bugs.
New warnings for C code that may have undefined semantics because of
violations of sequence point rules in the C standard (such as a = a++;,
a[n] = b[n++]; and a[i++] = i;), included in -Wall.
Additional warning option -Wfloat-equal.
Improvements to -Wtraditional.
Fortran improvements are listed in the Fortran documentation.
New Targets and Target Specific Improvements:
New x86 back-end, generating much improved code.
Support for a generic i386-elf target contributed.
New option to emit x86 assembly code using Intel style syntax
(-mintel-syntax).
HPUX 11 support contributed.
Improved PowerPC code generation, including scheduled prologue and
epilogue.
Port of gcc to Intel's IA-64 processor contributed.
Port of gcc to Motorola's MCore 210 and 340 contributed.
New unified back-end for Arm, Thumb and StrongArm contributed.
Port of gcc to Intel's XScale processor contributed.
Port of gcc to Atmel's AVR microcontrollers contributed.
Port of gcc to Mitsubishi's D30V processor contributed.
Port of gcc to Matsushita's AM33 processor (a member of the MN10300
processor family) contributed.
Port of gcc to Fujitsu's FR30 processor contributed.
Port of gcc to Motorola's 68HC11 and 68HC12 processors contributed.
Port of gcc to Sun's picoJava processor core contributed.
Documentation improvements:
Substantially rewritten and improved C preprocessor manual.
Many improvements to other documentation.
Manpages for gcc, cpp and gcov are now generated automatically from
the master Texinfo manual, eliminating the problem of manpages being out
of date. (The generated manpages are only extracts from the full
manual, which is provided in Texinfo form, from which info, HTML,
other formats and a printed manual can be generated.)
Generated info files are included in the release tarballs alongside
their Texinfo sources, avoiding problems on some platforms with building
makeinfo as part of the GCC distribution.
Other significant improvements:
Garbage collection used internally by the compiler for most memory
allocation instead of obstacks.
Lengauer and Tarjan algorithm used for computing dominators in the CFG.
This algorithm can be significantly faster and more space efficient
than our older algorithm.
gccbug script provided to assist in submitting bug reports to the GCC
GNATS bug tracking database. (Bug reports previously submitted
directly to the GCC mailing lists, for which no GNATS bug tracking
number has been received, should be submitted again to the bug
tracking database using gccbug if you can reproduce the problem with GCC
3.0.)
The internal libgcc library is built as a shared library on systems that
support it.
Extensive testsuite included with GCC, with many new tests. In
addition to tests for GCC bugs that have been fixed, many tests have
been added for language features, compiler warnings and builtin
functions.
Additional language-independent warning options -Wpacked, -Wpadded,
-Wunreachable-code and -Wdisabled-optimization.
Target-independent options -falign-functions, -falign-loops and
-falign-jumps.
Plus a great many bugfixes and almost all the features found in GCC 2.
95.
------------------------------------------------------------------------
--------
Please send FSF & GNU inquiries & questions to gnu@gnu.org. There are
also other ways to contact the FSF.
These pages are maintained by The GCC team.
Please send comments on these web pages and GCC to gcc@gcc.gnu.org, send
other questions to gnu@gnu.org.
Copyright (C) Free Software Foundation, Inc., 59 Temple Place - Suite
330, Boston, MA 02111, USA.
Verbatim copying and distribution of this entire article is permitted in
any medium, provided this notice is preserved.
Last modified 2001-06-18.
--
When you're lost and the light is fading
The wind blows cold and you can't find your way back home
Remember that the darkest hour is just before the dawn
Sometimes a leap of faith is all it takes
※ 来源:·荔园晨风BBS站 bbs.szu.edu.cn·[FROM: 202.105.185.168]
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