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, 3 insertions, 5 deletions

diff --git a/gcc/df-scan.c b/gcc/df-scan.c
index 9b08bdc..7ca1050 100644
--- a/gcc/df-scan.c
+++ b/gcc/df-scan.c
@@ -35,7 +35,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "emit-rtl.h"  /* FIXME: Can go away once crtl is moved to rtl.h.  */
 #include "dumpfile.h"
 #include "calls.h"
-
+#include "function-abi.h"
 
 /* The set of hard registers in eliminables[i].from. */
 
@@ -3088,13 +3088,11 @@ df_get_call_refs (class df_collection_rec *collection_rec,
   bool is_sibling_call;
   unsigned int i;
   HARD_REG_SET defs_generated;
-  HARD_REG_SET fn_reg_set_usage;
 
   CLEAR_HARD_REG_SET (defs_generated);
   df_find_hard_reg_defs (PATTERN (insn_info->insn), &defs_generated);
   is_sibling_call = SIBLING_CALL_P (insn_info->insn);
-  get_call_reg_set_usage (insn_info->insn, &fn_reg_set_usage,
-			  regs_invalidated_by_call);
+  function_abi callee_abi = insn_callee_abi (insn_info->insn);
 
   for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
     {
@@ -3118,7 +3116,7 @@ df_get_call_refs (class df_collection_rec *collection_rec,
 			       NULL, bb, insn_info, DF_REF_REG_DEF, flags);
 	    }
 	}
-      else if (TEST_HARD_REG_BIT (fn_reg_set_usage, i)
+      else if (callee_abi.clobbers_full_reg_p (i)
 	       /* no clobbers for regs that are the result of the call */
 	       && !TEST_HARD_REG_BIT (defs_generated, i)
 	       && (!is_sibling_call