This is another case in which we should conservatively treat
partial kills as full kills.
2019-09-11 Richard Sandiford <richard.sandif...@arm.com>
gcc/
* postreload-gcse.c: Include regs.h and function-abi.h.
(record_opr_changes): Use call_insn_abi to get the ABI of the
call insn target. Conservatively assume that partially-clobbered
registers are altered.
Index: gcc/postreload-gcse.c
===================================================================
--- gcc/postreload-gcse.c 2019-09-09 18:58:51.472270712 +0100
+++ gcc/postreload-gcse.c 2019-09-11 19:48:45.585690715 +0100
@@ -41,6 +41,8 @@ Software Foundation; either version 3, o
#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
@@ -770,9 +772,13 @@ record_opr_changes (rtx_insn *insn)
/* Finally, if this is a call, record all call clobbers. */
if (CALL_P (insn))
{
+ function_abi abi = call_insn_abi (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. */
+ EXECUTE_IF_SET_IN_HARD_REG_SET (abi.full_and_partial_reg_clobbers (),
+ 0, regno, hrsi)
record_last_reg_set_info_regno (insn, regno);
if (! RTL_CONST_OR_PURE_CALL_P (insn))
