AVR: Overhaul shift insns.

This patch adds 3-operand alternatives to the shift insns for
offsets that are one less than the bit-size of the mode.
For example, ashrhi3 can support "r,r,C15" without overhead.
Apart from that, the asm out functions for the shifts now use
avr_asm_len to print assembly and to track the isnsns' lengths.

gcc/
	* config/avr/avr.md (ashlhi3, *ashlhi3_const_split, *ashlhi3_const)
	(*ashlpsi3_split, *ashlpsi3)
	(ashlsi3, *ashlsi3_const_split, *ashlsi3_const)
	(ashrhi3, *ashrhi3, ashrpsi3, *ashrpsi3, ashrsi3, *ashrsi3)
	(*ashrhi3_const_split, *ashrhi3_const, *ashrsi3_const_split, *ashrsi3_const):
	Add constraint alternatives that allow a 3-operand operation when the
	shift offset is one less than the mode's bitsize.
	* config/avr/avr.cc (ashl<mode>3_out, ashr<mode>3_out)
	(lshr<mode>3_out): Use avr_asm_len for asm_out and length tracking.
	(ashrhi3_out, ashlhi3_out): Support the new "r,r,C15" alternatives.
	(ashrsi3_out, ashlsi3_out): Support the new "r,r,C31" alternatives.
	(avr_out_ashrpsi3, avr_out_ashlpsi3): Support the new "r,r,C23" alternatives.
gcc/testsuite/
	* gcc.target/avr/torture/test-shift.h: New file.
	* gcc.target/avr/torture/shift-l-u32.c: New test.
	* gcc.target/avr/torture/shift-r-u32.c: New test.
	* gcc.target/avr/torture/shift-r-i32.c: New test.
	* gcc.target/avr/torture/shift-l-u24.c: New test.
	* gcc.target/avr/torture/shift-r-u24.c: New test.
	* gcc.target/avr/torture/shift-r-i24.c: New test.
	* gcc.target/avr/torture/shift-l-u16.c: New test.
	* gcc.target/avr/torture/shift-r-u16.c: New test.
	* gcc.target/avr/torture/shift-r-i16.c: New test.
	* gcc.target/avr/torture/shift-l-u8.c: New test.
	* gcc.target/avr/torture/shift-r-u8.c: New test.
	* gcc.target/avr/torture/shift-r-i8.c: New test.

0 files changed, 0 insertions, 0 deletions