Remove global call sets: postreload-gcse.c

This is another case in which we should conservatively treat
partial kills as full kills.

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

gcc/
	* postreload-gcse.c: Include regs.h and function-abi.h.
	(record_opr_changes): Use insn_callee_abi to get the ABI of the
	call insn target.  Conservatively assume that partially-clobbered
	registers are altered.

From-SVN: r276329

gcc/ChangeLog

 2019-09-30  Richard Sandiford  <richard.sandiford@arm.com>
 
+	* postreload-gcse.c: Include regs.h and function-abi.h.
+	(record_opr_changes): Use insn_callee_abi to get the ABI of the
+	call insn target.  Conservatively assume that partially-clobbered
+	registers are altered.
+
+2019-09-30  Richard Sandiford  <richard.sandiford@arm.com>
+
 	* postreload.c (reload_combine_recognize_pattern): Use crtl->abi
 	when deciding whether a register is free for use after RA.
 	(reload_combine): Remove unnecessary use of fixed_reg_set.

gcc/postreload-gcse.c

@@ -41,6 +41,8 @@ along with GCC; see the file COPYING3.  If not see
 #include "intl.h"
 #include "gcse-common.h"
 #include "gcse.h"
+#include "regs.h"
+#include "function-abi.h"
 
 /* The following code implements gcse after reload, the purpose of this
    pass is to cleanup redundant loads generated by reload and other
@@ -772,7 +774,11 @@ record_opr_changes (rtx_insn *insn)
     {
       unsigned int regno;
       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_regno (insn, regno);
 
       if (! RTL_CONST_OR_PURE_CALL_P (insn))