------- Comment #3 from rsandifo at gcc dot gnu dot org 2008-03-22 19:38 ------- Subject: Bug 33927
Author: rsandifo Date: Sat Mar 22 19:37:53 2008 New Revision: 133452 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=133452 Log: 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. Modified: trunk/gcc/ChangeLog trunk/gcc/Makefile.in trunk/gcc/dse.c trunk/gcc/expmed.c trunk/gcc/expr.h trunk/gcc/rtlhooks.c trunk/gcc/testsuite/ChangeLog trunk/gcc/testsuite/gcc.target/mips/dse-1.c -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33927
