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PR target/49868 PR target/50887 * doc/extend.texi (Named Address Spaces): Split into subsections. (AVR Named Address Spaces): New subsection. (M32C Named Address Spaces): New subsection. (RL78 Named Address Spaces): New subsection. (SPU Named Address Spaces): New subsection. (Variable Attributes): New anchor "AVR Variable Attributes". (AVR Variable Attributes): Rewrite and avoid wording "address space" in this context. * doc/invoke.texi (AVR Options): Rewrite and add documentation for -maccumulate-args, -mbranch-cost=, -mrelax, -mshort-calls. (AVR Built-in Macros): New subsubsection therein. * doc/md.texi (AVR constraints): Remove "C04", "R". From-SVN: r183336
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