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gcc/ PR rtl-optimization/33927 * Makefile.in (dse.o): Depend on $(TM_P_H). * expr.h (extract_low_bits): Declare. * expmed.c (extract_low_bits): New function. * rtlhooks.c (gen_lowpart_general): Generalize SUBREG handling. * dse.c: Include tm_p.h. (find_shift_sequence): Remove the read_reg argument and return the read value. Emit the instructions instead of returning them. Iterate on new_mode rather than calculating it each time. Check MODES_TIEABLE_P. Use simplify_gen_subreg to convert the source to NEW_MODE and extract_low_bits to convert the shifted value to READ_MODE. (replace_read): Allow the load and store to have different mode classes. Use extract_low_bits when SHIFT == 0. Create the shift or extraction instructions before trying the replacement. Update dump-file code accordingly, avoiding use of REGNO (store_info->rhs). gcc/testsuite/ * gcc.target/mips/dse-1.c: Add checks for zeros. From-SVN: r133452
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