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C11 semantics for excess precision (from N1531) are that an implicit conversion (from the usual arithmetic conversions, not by assignment) from integer to floating point has a result in the corresponding evaluation format of that floating-point type, so possibly with excess precision (whereas a cast or conversion by assignment from integer to floating point must produce a value without excess range or precision, as always). This patch makes GCC support those semantics if flag_isoc11 (which in turn means that conditional expressions need to support generating a result with excess precision even if neither operand had excess precision). C99 is less than entirely clear in this regard, but my reading as outlined at <https://gcc.gnu.org/ml/gcc-patches/2008-11/msg00105.html> is that the results of conversions from integer to floating-point types are always expected to be representable in the target type without excess precision, and this patch conservatively keeps these semantics for pre-C11 (i.e. if an older standard is explicitly selected). Bootstrapped with no regressions on x86_64-pc-linux-gnu. PR c/82071 gcc/c: * c-typeck.c (ep_convert_and_check): Just call convert_and_check for C11. (build_conditional_expr): For C11, generate result with excess precision when one argument is an integer and the other is of a type using excess precision. gcc/testsuite: * gcc.target/i386/excess-precision-8.c: New test. From-SVN: r252847 |
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| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
| gnattools | ||
| gotools | ||
| include | ||
| INSTALL | ||
| intl | ||
| libada | ||
| libatomic | ||
| libbacktrace | ||
| libcc1 | ||
| libcilkrts | ||
| libcpp | ||
| libdecnumber | ||
| libffi | ||
| libgcc | ||
| libgfortran | ||
| libgo | ||
| libgomp | ||
| libhsail-rt | ||
| libiberty | ||
| libitm | ||
| libmpx | ||
| libobjc | ||
| liboffloadmic | ||
| libquadmath | ||
| libsanitizer | ||
| libssp | ||
| libstdc++-v3 | ||
| libvtv | ||
| lto-plugin | ||
| maintainer-scripts | ||
| zlib | ||
| .dir-locals.el | ||
| .gitattributes | ||
| .gitignore | ||
| ABOUT-NLS | ||
| ChangeLog | ||
| ChangeLog.jit | ||
| ChangeLog.tree-ssa | ||
| compile | ||
| config-ml.in | ||
| config.guess | ||
| config.rpath | ||
| config.sub | ||
| configure | ||
| configure.ac | ||
| COPYING | ||
| COPYING3 | ||
| COPYING3.LIB | ||
| COPYING.LIB | ||
| COPYING.RUNTIME | ||
| depcomp | ||
| install-sh | ||
| libtool-ldflags | ||
| libtool.m4 | ||
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| ltmain.sh | ||
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| ltversion.m4 | ||
| MAINTAINERS | ||
| Makefile.def | ||
| Makefile.in | ||
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| missing | ||
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| move-if-change | ||
| README | ||
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This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with 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/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.