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.
2019-09-11 Richard Sandiford <richard.sandif...@arm.com>
gcc/
* gcse.c: Include function-abi.h.
(compute_hash_table_work): Use call_insn_abi to get the ABI of
the call insn target. Invalidate partially call-clobbered
registers as well as fully call-clobbered ones.
Index: gcc/gcse.c
===================================================================
--- gcc/gcse.c 2019-09-09 18:58:51.468270740 +0100
+++ gcc/gcse.c 2019-09-11 19:48:23.453846664 +0100
@@ -160,6 +160,7 @@ Software Foundation; either version 3, o
#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.
@@ -1527,9 +1528,14 @@ compute_hash_table_work (struct gcse_has
if (CALL_P (insn))
{
+ function_abi abi = call_insn_abi (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. */
+ const_hard_reg_set clob = abi.full_and_partial_reg_clobbers ();
+ EXECUTE_IF_SET_IN_HARD_REG_SET (clob, 0, regno, hrsi)
record_last_reg_set_info (insn, regno);
if (! RTL_CONST_OR_PURE_CALL_P (insn)
