Hi, http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57518
pr57518 happened because update_equiv_regs in IRA marked a reg equivalent with a mem, lowered its mem_cost in scan_one_insn, set NO_REGS to its rclass, but didn't consider the reg was used in paradoxical subreg which prevented the reg from being replaced by mem in LRA phase. This patch is to check whether a reg is used in a paradoxical subreg in update_equiv_regs before reg is set as equivalent to a mem. bootstrap and regression test on x86_64-linux-gnu ok. Is it ok for trunk and gcc-4.8 branch? Thanks, Wei.
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