MSP430: Implement 64-bit shifts in assembly code

MSP430: Implement 64-bit shifts in assembly code

gcc/ChangeLog:

2019-06-16  Jozef Lawrynowicz  <jozef.l@mittosystems.com>

	* config/msp430/msp430.c (msp430_expand_helper): Setup arguments which
	describe how to perform MSPABI compliant 64-bit shift.
	* config/msp430/msp430.md (ashldi3): New define_expand.
	(ashrdi3): New define_expand.
	(lshrdi3): New define_expand.

libgcc/ChangeLog:

2019-06-16  Jozef Lawrynowicz  <jozef.l@mittosystems.com>

	* config/msp430/slli.S (__mspabi_sllll): New library function for
	performing a logical left shift of a 64-bit value.
	* config/msp430/srai.S (__mspabi_srall): New library function for
	performing a arithmetic right shift of a 64-bit value.
	* config/msp430/srll.S (__mspabi_srlll): New library function for
	performing a logical right shift of a 64-bit value.

gcc/testsuite/ChangeLog:

2019-06-16  Jozef Lawrynowicz  <jozef.l@mittosystems.com>

	* gcc.target/msp430/mspabi_sllll.c: New test.
	* gcc.target/msp430/mspabi_srall.c: New test.
	* gcc.target/msp430/mspabi_srlll.c: New test.
	* gcc.c-torture/execute/shiftdi-2.c: New test.

From-SVN: r272360