GCC 2.95 New Features

• General Optimizer Improvements:
  • Localized register spilling to improve speed and code density especially on small register class machines.
  • Global CSE using lazy code motion algorithms.
  • Improved global constant/copy propagation.
  • Improved control flow graph analysis and manipulation.
  • Local dead store elimination.
  • Memory Load hoisting/store sinking in loops.
  • Type based alias analysis is enabled by default. Note this feature will expose bugs in the Linux kernel. Please refer to the FAQ for additional information on this issue.
  • Major revamp of GIV detection, combination and simplification to improve loop performance.
  • Major improvements to register allocation and reloading.
• New Languages and Language specific improvements
  • Many C++ improvements.
  • Many Fortran improvements.
  • Java front-end has been integrated. A runtime library is available separately.
  • ISO C99 support
  • Chill front-end and runtime has been integrated.
  • Boehm garbage collector support in libobjc.
  • More support for various pragmas which appear in vendor include files
• New Targets and Target Specific Improvements
  • Sparc backend rewrite.
  • -mschedule=8000 will optimize code for PA8000 class processors; -mpa-risc-2-0 will generate code for PA2.0 processors
  • Various micro-optimizations for the ia32 port. K6 optimizations
  • Compiler will attempt to align doubles in the stack on the ia32 port
  • Alpha EV6 support
  • PowerPC 750
  • RS6000/PowerPC: -mcpu=401 was added as an alias for -mcpu=403. -mcpu=e603e was added to do -mcpu=603e and -msoft-float.
  • c3x, c4x
  • HyperSparc
  • SparcLite86x
  • sh4
  • Support for new systems (OpenBSD, FreeBSD, UWIN, Interix, arm-linux)
  • vxWorks targets include support for vxWorks threads
  • StrongARM 110 and ARM9 support added. ARM Scheduling parameters rewritten.
  • Various changes to the MIPS port to avoid assembler macros, which
  • Various performance improvements to the i960 port.
  • Major rewrite of ns32k port in turn improves performance
• Other significant improvements
  • Ability to dump cfg information and display it using vcg.
  • The new faster scheme for fixing vendor header files is enabled by default.
  • Experimental internationalization support.
  • multibyte character support
  • Some compile-time speedups for pathological problems
  • Better support for complex types
• Plus the usual mountain of bugfixes
• Core compiler is based on the gcc2 development tree from Sept 30, 1998, so we have all of the features found in GCC 2.8.