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MIPS: Add basic support for mips16e2
The MIPS16e2 ASE is an enhancement to the MIPS16e ASE, which includes all MIPS16e instructions, with some addition. It defines new special instructions for increasing code density (e.g. Extend, PC-relative instructions, etc.). This patch adds basic support for mips16e2 used by the following series of patches. gcc/ChangeLog: * config/mips/mips.cc(mips_file_start): Add mips16e2 info for output file. * config/mips/mips.h(__mips_mips16e2): Defined a new predefine macro. (ISA_HAS_MIPS16E2): Defined a new macro. (ASM_SPEC): Pass mmips16e2 to the assembler. * config/mips/mips.opt: Add -m(no-)mips16e2 option. * config/mips/predicates.md: Add clause for TARGET_MIPS16E2. * doc/invoke.texi: Add -m(no-)mips16e2 option.. gcc/testsuite/ChangeLog: * gcc.target/mips/mips.exp(mips_option_groups): Add -mmips16e2 option. (mips-dg-init): Handle the recognization of mips16e2 targets. (mips-dg-options): Add dependencies for mips16e2.
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