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Introduce LoongArch32 (LA32) ilp32d abi and LoongArch32 Reduced (LA32R) ilp32s abi. Add march la32v1.0 and la32rv1.0. Add mtune loongarch32 as a general tune. Add la32 march and mtune to gcc/doc/invoke.texi. contrib/ChangeLog: * config-list.mk: Add loongarch32-linux-gnu*. gcc/ChangeLog: * config.gcc: Add target triple loongarch32-*-*-* and corresponding abi ilp32f, ilp32d and ilp32s. * config/loongarch/genopts/loongarch-strings: Add strings for loongarch32 and ilp32 abi variants. * config/loongarch/genopts/loongarch.opt.in: Add -march=la32v1.0/la32rv1.0 and -mabi=ilp32d/ilp32f/ilp32s. * config/loongarch/gnu-user.h: Add ilp32 abi variants to spec. * config/loongarch/linux.h: Add ABI_LIBDIR for ilp32 abi variants. * config/loongarch/loongarch-c.cc (loongarch_define_unconditional_macros): Add builtin definitions for loongarch32 target. * config/loongarch/loongarch-def.cc: Add loongarch32 and ilp32 definitions. * config/loongarch/loongarch-def.h: Add loongarch32 and ilp32 definitions. * config/loongarch/loongarch-driver.h: Add ilp32 abi variants to spec. * config/loongarch/loongarch-opts.cc: Handle ilp32 abi variants. * config/loongarch/loongarch-opts.h: Add loongarch32 case to macros. * config/loongarch/loongarch-str.h: Add loongarch32 and ilp32 strings. * config/loongarch/loongarch.opt: Add -march=la32v1.0/la32rv1.0 and -mabi=ilp32d/ilp32f/ilp32s. * config/loongarch/t-linux: Add ilp32 abi variants to multilib. * doc/invoke.texi: Add LA32 arch and tune. libitm/ChangeLog: * config/loongarch/asm.h: Fix ilp32 detection. Co-authored-by: Jiajie Chen <c@jia.je> Reviewed-by: Xi Ruoyao <xry111@xry111.site> Reviewed-by: Lulu Cheng <chenglulu@loongson.cn>