Add a no_register_allocation target hook.

	* target.def (no_register_allocation): New data hook.
	* doc/tm.texi.in: Add @hook TARGET_NO_REGISTER_ALLOCATION.
	* doc/tm.texi: Regenerate.
	* ira.c (gate_ira): New function.
	(pass_data_ira): Set has_gate.
	(pass_ira): Add a gate function.
	(pass_data_reload): Likewise.
	(pass_reload): Add a gate function.
	(pass_ira): Use it.
	* reload1.c (eliminate_regs): If reg_eliminate_is NULL, assert that
	no register allocation happens on the target and return.
	* final.c (alter_subreg): Ensure register is not a pseudo before
	calling simplify_subreg.
	(output_operand): Assert that x isn't a pseudo only if doing
	register allocation.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@217122 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 5 insertions, 0 deletions

diff --git a/gcc/reload1.c b/gcc/reload1.c
index dab8a7532e0..7d5bad51d88 100644
--- a/gcc/reload1.c
+++ b/gcc/reload1.c
@@ -2968,6 +2968,11 @@ eliminate_regs_1 (rtx x, machine_mode mem_mode, rtx insn,
 rtx
 eliminate_regs (rtx x, machine_mode mem_mode, rtx insn)
 {
+  if (reg_eliminate == NULL)
+    {
+      gcc_assert (targetm.no_register_allocation);
+      return x;
+    }
   return eliminate_regs_1 (x, mem_mode, insn, false, false);
 }