84682fd249
Many parallel set insns are of the form of a single set that also sets the condition code flags. In this case the cost of such an insn is normally the cost of the part that doesn't set the flags, since updating the condition flags is simply a side effect. At present all such insns are treated as having unknown cost (ie 0) and combine assumes that such insns are infinitely more expensive than any other insn sequence with a non-zero cost. This patch addresses this problem by allowing insn_rtx_cost to ignore the condition setting part of a PARALLEL iff there is exactly one comparison set and one non-comparison set. If the only set operation is a comparison we still use that as the basis of the insn cost. * rtlanal.c (insn_rtx_cost): If a parallel contains exactly one comparison set and one other set, use the cost of the non-comparison set. Bootstrapped on aarch64-none-linuxgnu From-SVN: r249850 |
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| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
| gnattools | ||
| gotools | ||
| include | ||
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| libgcc | ||
| libgfortran | ||
| libgo | ||
| libgomp | ||
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| libiberty | ||
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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.