05d362b88d
* fold-const.c (negate_mathfn_p): New function to determine whether a built-in mathematical function is sign preserving, f(-x) == -f(x). Add support for BUILT_IN_ASIN, BUILT_IN_ASINF and BUILT_IN_ASINL. (tree_swap_operands_p): Change API to take an additional argument indicating that the swapped operands evaluate in reverse order. Canonicalize VAR_DECLs and PARM_DECLs last if we can, i.e. neither operand side-effects or we don't care about flag_evaluation_order. (reorder_operands_p): New function to check whether its safe to evaluate the given operands in reverse order. (negate_expr_p): We can always negate integer constants unless we honor -ftrapv and the signed type would overflow. Only allow -(A-B) into B-A if reorder_operands_p says that its OK. Allow negation of COMPLEX_CST if both real and imaginary parts can be negated. Allow negation through floating point extensions and sign-preserving built-in functions. (negate_expr): Move the code to negate integers from "fold" to here. Always negate integer constants unless we honor -ftrapv 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 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 to negate_expr_p/negate_expr. (fold <MINUS_EXPR>): Use reorder_operands_p to check whether we're allowed to convert (-A) - B into (-B) - A. From-SVN: r72381 |
||
|---|---|---|
| boehm-gc | ||
| config | ||
| contrib | ||
| fastjar | ||
| gcc | ||
| include | ||
| INSTALL | ||
| intl | ||
| libf2c | ||
| libffi | ||
| libiberty | ||
| libjava | ||
| libobjc | ||
| libstdc++-v3 | ||
| maintainer-scripts | ||
| zlib | ||
| .cvsignore | ||
| ABOUT-NLS | ||
| ChangeLog | ||
| config-ml.in | ||
| config.guess | ||
| config.if | ||
| config.rpath | ||
| config.sub | ||
| configure | ||
| configure.in | ||
| COPYING | ||
| COPYING.LIB | ||
| install-sh | ||
| libtool.m4 | ||
| ltcf-c.sh | ||
| ltcf-cxx.sh | ||
| ltcf-gcj.sh | ||
| ltconfig | ||
| ltmain.sh | ||
| MAINTAINERS | ||
| Makefile.def | ||
| Makefile.in | ||
| Makefile.tpl | ||
| missing | ||
| mkdep | ||
| mkinstalldirs | ||
| move-if-change | ||
| README | ||
| README.SCO | ||
| symlink-tree | ||
| ylwrap | ||
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the file COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs.html for how to report bugs usefully.