rs6000.c (rs6000_opt_vars): Add entry for -mspeculate-indirect-jumps.

rs6000.c (rs6000_opt_vars): Add entry for -mspeculate-indirect-jumps.

[gcc]

2018-01-16  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	* config/rs6000/rs6000.c (rs6000_opt_vars): Add entry for
	-mspeculate-indirect-jumps.
	* config/rs6000/rs6000.md (*call_indirect_elfv2<mode>): Disable
	for -mno-speculate-indirect-jumps.
	(*call_indirect_elfv2<mode>_nospec): New define_insn.
	(*call_value_indirect_elfv2<mode>): Disable for
	-mno-speculate-indirect-jumps.
	(*call_value_indirect_elfv2<mode>_nospec): New define_insn.
	(indirect_jump): Emit different RTL for
	-mno-speculate-indirect-jumps.
	(*indirect_jump<mode>): Disable for
	-mno-speculate-indirect-jumps.
	(*indirect_jump<mode>_nospec): New define_insn.
	(tablejump): Emit different RTL for
	-mno-speculate-indirect-jumps.
	(tablejumpsi): Disable for -mno-speculate-indirect-jumps.
	(tablejumpsi_nospec): New define_expand.
	(tablejumpdi): Disable for -mno-speculate-indirect-jumps.
	(tablejumpdi_nospec): New define_expand.
	(*tablejump<mode>_internal1): Disable for
	-mno-speculate-indirect-jumps.
	(*tablejump<mode>_internal1_nospec): New define_insn.
	* config/rs6000/rs6000.opt (mspeculate-indirect-jumps): New
	option.

[gcc/testsuite]

2018-01-16  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	* gcc.target/powerpc/safe-indirect-jump-1.c: New file.
	* gcc.target/powerpc/safe-indirect-jump-2.c: New file.
	* gcc.target/powerpc/safe-indirect-jump-3.c: New file.
	* gcc.target/powerpc/safe-indirect-jump-4.c: New file.
	* gcc.target/powerpc/safe-indirect-jump-5.c: New file.
	* gcc.target/powerpc/safe-indirect-jump-6.c: New file.

From-SVN: r256753