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When rhs equals to 0x7fffffff, adding 1 to rhs overflows SI, generating invalid const_int. gcc/ChangeLog: * config/loongarch/loongarch.cc (loongarch_emit_int_compare): Call trunc_int_mode to ensure valid rhs. gcc/testsuite/ChangeLog: * gcc.target/loongarch/la32/trunc_int_for_mode.c: New test. Reviewed-by: Xi Ruoyao <xry111@xry111.site> Reviewed-by: Lulu Cheng <chenglulu@loongson.cn>
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