r128530 - in /trunk/gcc: ChangeLog dse.c testsu...

[rsandifo@gcc.gnu.org]

Author: rsandifo
Date: Sun Sep 16 21:02:54 2007
New Revision: 128530

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=128530
Log:
gcc/
	* dse.c (find_shift_sequence): Allow word as well as subword shifts.
	Do the tentative shift expansion with the DF_NO_INSN_RESCAN flag set.
	Fix the call to insn_rtx_cost.  Skip access sizes that require a
	real truncation of the store register.  Use convert_move instead
	of gen_lowpart when narrowing the result.
	(replace_read): Use convert_move instead of gen_lowpart when
	narrowing the store rhs.

gcc/testsuite/
	* gcc.target/mips/dse-1.c: New test.

Added:
    trunk/gcc/testsuite/gcc.target/mips/dse-1.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/dse.c
    trunk/gcc/testsuite/ChangeLog