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Re: [4.4 resubmission]

> [Eric, you rashly volunteered to be pinged about this after 4.3 branched.]

Sorry for the delay, I wasn't in reviewing mode lately. :-)

> gcc/
> 	* (dse.o): Depend on $(TM_P_H).
> 	* optabs.h (extract_low_bits): Declare.
> 	* optabs.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/
> 	* Add checks for zeros.

This is OK for mainline, modulo the location of extract_low_bits: why not put 
it in emit-rtl.c like gen_lowpart_*?  I appreciate the different semantics 
but optabs.c seems a little strange.

Eric Botcazou

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