re PR target/36467 ([avr] Missed optimization with pointer arithmetic and mul*)
PR target/36467 PR target/49687 * config/avr/avr.md (mulhi3): Use register_or_s9_operand for operand2 and expand appropriately if there is a CONST_INT in operand2. (usmulqihi3): New insn. (*sumulqihi3): New insn. (*osmulqihi3): New insn. (*oumulqihi3): New insn. (*muluqihi3.uconst): New insn_and_split. (*muluqihi3.sconst): New insn_and_split. (*mulsqihi3.sconst): New insn_and_split. (*mulsqihi3.uconst): New insn_and_split. (*mulsqihi3.oconst): New insn_and_split. (*ashifthi3.signx.const): New insn_and_split. (*ashifthi3.signx.const7): New insn_and_split. (*ashifthi3.zerox.const): New insn_and_split. (mulsqihi3): New insn. (muluqihi3): New insn. (muloqihi3): New insn. * config/avr/predicates.md (const_2_to_7_operand): New. (const_2_to_6_operand): New. (u8_operand): New. (s8_operand): New. (o8_operand): New. (s9_operand): New. (register_or_s9_operand): New. From-SVN: r176527
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