Imported gcc-4.4.3

[msp430-gcc.git] / gcc / ONEWS

diff --git a/gcc/ONEWS b/gcc/ONEWS
index 4d4b54b65c13dd935ffbd563e578a84922fa687b..f4b358102ee7f7d5a3fefc3dfe68ac8273a8a954 100644 (file)
--- a/gcc/ONEWS
+++ b/gcc/ONEWS
@@ -1,112 +1,28 @@
 This file contains information about GCC releases up to GCC 2.8.1, and
 This file contains information about GCC releases up to GCC 2.8.1, and

-some information about EGCS releases.  For more details of changes in
-EGCS releases, and details of changes in GCC 2.95 and more recent
-releases, see the release notes on the GCC web site and the file NEWS
-which contains the most relevant parts of those release notes in text
-form.
+a tiny bit of information on EGCS.

 
 

-Noteworthy changes in GCC for EGCS 1.1.
----------------------------------------
-
-The compiler now implements global common subexpression elimination (gcse) as
-well as global constant/copy propagation.  (link to gcse page).
-
-More major improvements have been made to the alias analysis code.  A new
-option to allow front-ends to provide alias information to the optimizers
-has also been added (-fstrict-aliasing).  -fstrict-aliasing is off by default
-now, but will be enabled by default in the future. (link to alias page)
-
-Major changes continue in the exception handling support.  This release
-includes some changes to reduce static overhead for exception handling.  It
-also includes some major changes to the setjmp/longjmp based EH mechanism to
-make it less pessimistic.  And finally, major infrastructure improvements
-to the dwarf2 EH mechanism have been made to make our EH support extensible.
-
-We have fixed the infamous security problems with temporary files. 
-
-The "regmove" optimization pass has been nearly completely rewritten.  It now
-uses much more information about the target to determine profitability of
-transformations.
+For details of changes in EGCS releases and GCC 2.95 and later releases,
+see the release notes on the GCC web site or the file NEWS which contains
+the most relevant parts of those release notes in text form.

 
 

-The compiler now recomputes register usage information immediately before
-register allocation.  Previously such information was only not kept up to
-date after instruction combination which led to poor register allocation
-choices by our priority based register allocator.
-
-The register reloading phase of the compiler has been improved to better
-optimize spill code.  This primarily helps targets which generate lots of
-spills (like the x86 ports and many register poor embedded ports).
-
-A few changes in the heuristics used by the register allocator and scheduler
-have been made which can significantly improve performance for certain
-applications.
-
-The compiler's branch shortening algorithms have been significantly improved
-to work better on targets which align jump targets.
+Changes in GCC for EGCS (that are not listed in the web release notes)
+---------------------------------------------------------------------

 
 The compiler now supports the "ADDRESSOF" optimization which can significantly
 reduce the overhead for certain inline calls (and inline calls in general).
 
 
 The compiler now supports the "ADDRESSOF" optimization which can significantly
 reduce the overhead for certain inline calls (and inline calls in general).
 

-The compiler now supports a code size optimization switch (-Os).  When enabled
-the compiler will prefer optimizations which improve code size over those
-which improve code speed.
-
-The compiler has been improved to completely eliminate library calls which
-compute constant values.  This is particularly useful on machines which
-do not have integer mul/div or floating point support on-chip.
-
-GCC now supports a "--help" option to print detailed help information.
-
-cpplib has been greatly improved.  It is probably usable for some sites now
-(major missing feature is trigraphs).
-
-Memory footprint for the compiler has been significantly reduced for certain
-pathalogical cases.
-
-Build time improvements for targets which support lots of sched parameters
-(alpha and mips primarily).
-

 Compile time for certain programs using large constant initializers has been
 improved (affects glibc significantly).
 
 Compile time for certain programs using large constant initializers has been
 improved (affects glibc significantly).
 

-Plus an incredible number of infrastructure changes, warning fixes, bugfixes
-and local optimizations.
-

 Various improvements have been made to better support cross compilations.  They
 are still not easy, but they are improving.
 
 Various improvements have been made to better support cross compilations.  They
 are still not easy, but they are improving.
 

-Target specific NEWS
-
-    Sparc: Now includes V8 plus and V9 support, lots of tuning for Ultrasparcs
-           and uses the Haifa scheduler by default.
-
-    Alpha: EV6 tuned, optimized expansion of memcpy/bzero.
-
-    x86: Data in the static store is aligned per Intel recommendations.  Jump
-         targets are aligned per Intel recommendations.  Improved epilogue
-         sequences for Pentium chips.  Backend improvements which should help
-         register allocation on all x86 variants.  Support for PPro conditional
-         move instructions has been fixed and enabled.  Random changes
-        throughout the port to make generated code more Pentium friendly.
-         Improved support for 64bit integer operations.
-         Unixware 7, a System V Release 5 target is now supported.
-         SCO OpenServer targets can support GAS.  See gcc/INSTALL for details.
-
-    RS6000/PowerPC: Includes AIX4.3 support as well as PowerPC64 support.  
-                    Haifa instruction scheduling is enabled by default now.
-
-    MIPS: Multiply/Multiply-Add support has been largely rewritten to generate
-          more efficient code.  Includes mips16 support.
-
-    M68K: Various micro-optimizations and Coldfire fixes.
+Target-specific changes:

 
     M32r: Major improvements to this port.
 
     Arm: Includes Thumb and super interworking support.
 
 
     M32r: Major improvements to this port.
 
     Arm: Includes Thumb and super interworking support.
 

-EGCS includes all gcc2 changes up to and including the June 9, 1998 snapshot.
-
-

 Noteworthy changes in GCC version 2.8.1
 ---------------------------------------
 
 Noteworthy changes in GCC version 2.8.1
 ---------------------------------------