rs6000-p8swap.c (const_load_sequence_p): Revise this function to return false if...

rs6000-p8swap.c (const_load_sequence_p): Revise this function to return false if the definition used by the swap...

gcc/ChangeLog:

2017-09-27  Kelvin Nilsen  <kelvin@gcc.gnu.org>

	* config/rs6000/rs6000-p8swap.c (const_load_sequence_p): Revise
	this function to return false if the definition used by the swap
	instruction is artificial, or if the memory address from which the
	constant value is loaded is not represented by a base address held
	in a register or if the base address register is a frame or stack
	pointer.  Additionally, return false if the base address of the
	loaded constant is a SYMBOL_REF but is not considered to be a
	constant.
	(replace_swapped_load_constant): New function.
	(rs6000_analyze_swaps): Add a new pass to replace a swap of a
	loaded constant vector with a load of a swapped constant vector.

gcc/testsuite/ChangeLog:

2017-09-27  Kelvin Nilsen  <kelvin@gcc.gnu.org>

	* gcc.target/powerpc/swaps-p8-28.c: New test.
	* gcc.target/powerpc/swaps-p8-29.c: New test.
	* gcc.target/powerpc/swaps-p8-30.c: New test.
	* gcc.target/powerpc/swaps-p8-31.c: New test.
	* gcc.target/powerpc/swaps-p8-32.c: New test.
	* gcc.target/powerpc/swaps-p8-33.c: New test.
	* gcc.target/powerpc/swaps-p8-34.c: New test.
	* gcc.target/powerpc/swaps-p8-35.c: New test.
	* gcc.target/powerpc/swaps-p8-36.c: New test.
	* gcc.target/powerpc/swaps-p8-37.c: New test.
	* gcc.target/powerpc/swaps-p8-38.c: New test.
	* gcc.target/powerpc/swaps-p8-39.c: New test.
	* gcc.target/powerpc/swaps-p8-40.c: New test.
	* gcc.target/powerpc/swaps-p8-41.c: New test.
	* gcc.target/powerpc/swaps-p8-42.c: New test.
	* gcc.target/powerpc/swaps-p8-43.c: New test.
	* gcc.target/powerpc/swaps-p8-44.c: New test.
	* gcc.target/powerpc/swaps-p8-45.c: New test.

From-SVN: r253240