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Sat Aug 29 12:39:56 1998 Jeffrey A Law (law@cygnus.com)
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* NEWS: Various updates.
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Fri Aug 28 19:00:44 1998 David S. Miller <davem@pierdol.cobaltmicro.com>
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* config/sparc/sparc.c (arith_operand, const64_operand,
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gcc/NEWS
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Noteworthy changes in GCC for EGCS.
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Noteworthy changes in GCC for EGCS 1.1.
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---------------------------------------
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The compiler now implements global common subexpression elimination (gcse) as
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well as global constant/copy propagation. (link to gcse page).
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More major improvements have been made to the alias analysis code. A new
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option to allow front-ends to provide alias information to the optimizers
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has also been added (-fstrict-aliasing). -fstrict-aliasing is off by default
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now, but will be enabled by default in the future. (link to alias page)
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Major changes continue in the exception handling support. This release
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includes some changes to reduce static overhead for exception handling. It
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also includes some major changes to the setjmp/longjmp based EH mechanism to
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make it less pessimistic. And finally, major infrastructure improvements
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to the dwarf2 EH mechanism have been made to make our EH support extensible.
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We have fixed the infamous security problems with temporary files.
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The "regmove" optimization pass has been nearly completely rewritten. It now
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uses much more information about the target to determine profitability of
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transformations.
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The compiler now recomputes register usage information immediately before
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register allocation. Previously such information was only not kept up to
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date after instruction combination which led to poor register allocation
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choices by our priority based register allocator.
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The register reloading phase of the compiler has been improved to better
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optimize spill code. This primarily helps targets which generate lots of
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spills (like the x86 ports and many register poor embedded ports).
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A few changes in the heuristics used by the register allocator and scheduler
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have been made which can significantly improve performance for certain
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applications.
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The compiler's branch shortening algorithms have been significantly improved
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to work better on targets which align jump targets.
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The compiler now supports the "ADDRESSOF" optimization which can significantly
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reduce the overhead for certain inline calls (and inline calls in general).
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The compiler now supports a code size optimization switch (-Os). When enabled
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the compiler will prefer optimizations which improve code size over those
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which improve code speed.
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The compiler has been improved to completely eliminate library calls which
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compute constant values. This is particularly useful on machines which
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do not have integer mul/div or floating point support on-chip.
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GCC now supports a "--help" option to print detailed help information.
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cpplib has been greatly improved. It is probably useable for some sites now
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(major missing feature is trigraphs).
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Memory footprint for the compiler has been significantly reduced for certain
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pathalogical cases.
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Build time improvements for targets which support lots of sched parameters
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(alpha and mips primarily).
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Compile time for certain programs using large constant initializers has been
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improved (effects glibc significantly).
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Plus an incredible number of infrastructure changes, warning fixes, bugfixes
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and local optimizations.
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Various improvements have been made to better support cross compilations. They
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are still not easy, but they are improving.
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Target specific NEWS
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Sparc: Now includes V8 plus and V9 support, lots of tuning for Ultrasparcs
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and uses the Haifa scheduler by default.
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Alpha: EV6 tuned, optimized expansion of memcpy/bzero.
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x86: Data in the static store is aligned per Intel recommendations. Jump
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targets are aligned per Intel recommendations. Improved epilogue
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sequences for Pentium chips. Backend improvements which should help
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register allocation on all x86 variants. Support for PPro conditional
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move instructions has been fixed and enabled. Random changes
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throughout the port to make generated code more Pentium friendly.
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Improved support for 64bit integer operations.
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RS6000/PowerPC: Includes AIX4.3 support as well as PowerPC64 support.
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Haifa instruction scheduling is enabled by default now.
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MIPS: Multiply/Multiply-Add support has been largely rewritten to generate
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more efficient code. Includes mips16 support.
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M68K: Various micro-optimizations and Coldfire fixes.
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M32r: Major improvements to this port.
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Arm: Includes Thumb and super interworking support.
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EGCS includes all gcc2 changes up to and including the June 9, 1998 snapshot.
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Noteworthy changes in GCC version 2.8.1
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---------------------------------------
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