Add a function for getting the ABI of a call insn target

This patch replaces get_call_reg_set_usage with insn_callee_abi,
which returns the ABI of the target of a call insn.  The ABI's
full_reg_clobbers corresponds to regs_invalidated_by_call,
whereas many callers instead passed call_used_or_fixed_regs, i.e.:

  (regs_invalidated_by_call | fixed_reg_set)

The patch slavishly preserves the "| fixed_reg_set" for these callers;
later patches will clean this up.

2019-09-30  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* target.def (insn_callee_abi): New hook.
	(remove_extra_call_preserved_regs): Delete.
	* doc/tm.texi.in (TARGET_INSN_CALLEE_ABI): New macro.
	(TARGET_REMOVE_EXTRA_CALL_PRESERVED_REGS): Delete.
	* doc/tm.texi: Regenerate.
	* targhooks.h (default_remove_extra_call_preserved_regs): Delete.
	* targhooks.c (default_remove_extra_call_preserved_regs): Delete.
	* config/aarch64/aarch64.c (aarch64_simd_call_p): Constify the
	insn argument.
	(aarch64_remove_extra_call_preserved_regs): Delete.
	(aarch64_insn_callee_abi): New function.
	(TARGET_REMOVE_EXTRA_CALL_PRESERVED_REGS): Delete.
	(TARGET_INSN_CALLEE_ABI): New macro.
	* rtl.h (get_call_fndecl): Declare.
	(cgraph_rtl_info): Fix formatting.  Tweak comment for
	function_used_regs.  Remove function_used_regs_valid.
	* rtlanal.c (get_call_fndecl): Moved from final.c
	* function-abi.h (insn_callee_abi): Declare.
	(target_function_abi_info): Mention insn_callee_abi.
	* function-abi.cc (fndecl_abi): Handle flag_ipa_ra in a similar
	way to get_call_reg_set_usage did.
	(insn_callee_abi): New function.
	* regs.h (get_call_reg_set_usage): Delete.
	* final.c: Include function-abi.h.
	(collect_fn_hard_reg_usage): Add fixed and stack registers to
	function_used_regs before the main loop rather than afterwards.
	Use insn_callee_abi instead of get_call_reg_set_usage.  Exit early
	if function_used_regs ends up not being useful.
	(get_call_fndecl): Move to rtlanal.c
	(get_call_cgraph_rtl_info, get_call_reg_set_usage): Delete.
	* caller-save.c: Include function-abi.h.
	(setup_save_areas, save_call_clobbered_regs): Use insn_callee_abi
	instead of get_call_reg_set_usage.
	* cfgcleanup.c: Include function-abi.h.
	(old_insns_match_p): Use insn_callee_abi instead of
	get_call_reg_set_usage.
	* cgraph.h (cgraph_node::rtl_info): Take a const_tree instead of
	a tree.
	* cgraph.c (cgraph_node::rtl_info): Likewise.  Initialize
	function_used_regs.
	* df-scan.c: Include function-abi.h.
	(df_get_call_refs): Use insn_callee_abi instead of
	get_call_reg_set_usage.
	* ira-lives.c: Include function-abi.h.
	(process_bb_node_lives): Use insn_callee_abi instead of
	get_call_reg_set_usage.
	* lra-lives.c: Include function-abi.h.
	(process_bb_lives): Use insn_callee_abi instead of
	get_call_reg_set_usage.
	* postreload.c: Include function-abi.h.
	(reload_combine): Use insn_callee_abi instead of
	get_call_reg_set_usage.
	* regcprop.c: Include function-abi.h.
	(copyprop_hardreg_forward_1): Use insn_callee_abi instead of
	get_call_reg_set_usage.
	* resource.c: Include function-abi.h.
	(mark_set_resources, mark_target_live_regs): Use insn_callee_abi
	instead of get_call_reg_set_usage.
	* var-tracking.c: Include function-abi.h.
	(dataflow_set_clear_at_call): Use insn_callee_abi instead of
	get_call_reg_set_usage.

From-SVN: r276309

1 files changed, 4 insertions, 7 deletions

diff --git a/gcc/resource.c b/gcc/resource.c
index 2d30e08..c66b6e3 100644
--- a/gcc/resource.c
+++ b/gcc/resource.c
@@ -30,6 +30,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "resource.h"
 #include "insn-attr.h"
 #include "params.h"
+#include "function-abi.h"
 
 /* This structure is used to record liveness information at the targets or
    fallthrough insns of branches.  We will most likely need the information
@@ -662,12 +663,10 @@ mark_set_resources (rtx x, struct resources *res, int in_dest,
 	{
 	  rtx_call_insn *call_insn = as_a <rtx_call_insn *> (x);
 	  rtx link;
-	  HARD_REG_SET regs;
 
 	  res->cc = res->memory = 1;
 
-	  get_call_reg_set_usage (call_insn, &regs, regs_invalidated_by_call);
-	  res->regs |= regs;
+	  res->regs |= insn_callee_abi (call_insn).full_reg_clobbers ();
 
 	  for (link = CALL_INSN_FUNCTION_USAGE (call_insn);
 	       link; link = XEXP (link, 1))
@@ -1038,10 +1037,8 @@ mark_target_live_regs (rtx_insn *insns, rtx target_maybe_return, struct resource
 		 predicated instruction, or if the CALL is NORETURN.  */
 	      if (GET_CODE (PATTERN (real_insn)) != COND_EXEC)
 		{
-		  HARD_REG_SET regs_invalidated_by_this_call;
-		  get_call_reg_set_usage (real_insn,
-					  &regs_invalidated_by_this_call,
-					  regs_invalidated_by_call);
+		  HARD_REG_SET regs_invalidated_by_this_call
+		    = insn_callee_abi (real_insn).full_reg_clobbers ();
 		  /* CALL clobbers all call-used regs that aren't fixed except
 		     sp, ap, and fp.  Do this before setting the result of the
 		     call live.  */