Remove global call sets: gcse.c

This is another case in which we can conservatively treat partial
kills as full kills.  Again this is in principle a bug fix for
TARGET_HARD_REGNO_CALL_PART_CLOBBERED targets, but in practice
it probably doesn't make a difference.

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

gcc/
	* gcse.c: Include function-abi.h.
	(compute_hash_table_work): Use insn_callee_abi to get the ABI of
	the call insn target.  Invalidate partially call-clobbered
	registers as well as fully call-clobbered ones.

From-SVN: r276323

gcc/ChangeLog

 2019-09-30  Richard Sandiford  <richard.sandiford@arm.com>
 
+	* gcse.c: Include function-abi.h.
+	(compute_hash_table_work): Use insn_callee_abi to get the ABI of
+	the call insn target.  Invalidate partially call-clobbered
+	registers as well as fully call-clobbered ones.
+
+2019-09-30  Richard Sandiford  <richard.sandiford@arm.com>
+
 	* function.c (aggregate_value_p): Work out which ABI the
 	function is using before testing which registers are at least
 	partly preserved by a call.

gcc/gcse.c

@@ -160,6 +160,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "dbgcnt.h"
 #include "gcse.h"
 #include "gcse-common.h"
+#include "function-abi.h"
 
 /* We support GCSE via Partial Redundancy Elimination.  PRE optimizations
    are a superset of those done by classic GCSE.
@@ -1528,8 +1529,13 @@ compute_hash_table_work (struct gcse_hash_table_d *table)
 	  if (CALL_P (insn))
 	    {
 	      hard_reg_set_iterator hrsi;
-	      EXECUTE_IF_SET_IN_HARD_REG_SET (regs_invalidated_by_call,
-					      0, regno, hrsi)
+
+	      /* We don't track modes of hard registers, so we need
+		 to be conservative and assume that partial kills
+		 are full kills.  */
+	      HARD_REG_SET callee_clobbers
+		= insn_callee_abi (insn).full_and_partial_reg_clobbers ();
+	      EXECUTE_IF_SET_IN_HARD_REG_SET (callee_clobbers, 0, regno, hrsi)
 		record_last_reg_set_info (insn, regno);
 
 	      if (! RTL_CONST_OR_PURE_CALL_P (insn)