The inheritance code in find_equiv_reg can use clobbers_reg_p
to test whether a call clobbers either of the equivalent registers.
reload and find_reg use crtl->abi to test whether a register needs
to be saved in the prologue before use.
reload_as_needed can use full_and_partial_reg_clobbers and thus
avoid needing to keep its own record of which registers are part
call-clobbered.
2019-09-11 Richard Sandiford
gcc/
* reload.c: Include function-abi.h.
(find_equiv_reg): Use clobbers_reg_p to test whether either
of the equivalent registers is clobbered by a call.
* reload1.c: Include function-abi.h.
(reg_reloaded_call_part_clobbered): Delete.
(reload): Use crtl->abi to test which registers would need
saving in the prologue before use.
(find_reg): Likewise.
(emit_reload_insns): Remove code for reg_reloaded_call_part_clobbered.
(reload_as_needed): Likewise. Use full_and_partial_reg_clobbers
instead of call_used_or_fixed_regs | reg_reloaded_call_part_clobbered.
Index: gcc/reload.c
===
--- gcc/reload.c2019-09-11 19:47:32.902202887 +0100
+++ gcc/reload.c2019-09-11 19:49:00.269587248 +0100
@@ -106,6 +106,7 @@ #define REG_OK_STRICT
#include "reload.h"
#include "addresses.h"
#include "params.h"
+#include "function-abi.h"
/* True if X is a constant that can be forced into the constant pool.
MODE is the mode of the operand, or VOIDmode if not known. */
@@ -6904,24 +6905,19 @@ find_equiv_reg (rtx goal, rtx_insn *insn
if either of the two is in a call-clobbered register, or memory. */
if (CALL_P (p))
{
- int i;
-
if (goal_mem || need_stable_sp)
return 0;
- if (regno >= 0 && regno < FIRST_PSEUDO_REGISTER)
- for (i = 0; i < nregs; ++i)
- if (call_used_or_fixed_reg_p (regno + i)
- || targetm.hard_regno_call_part_clobbered (0, regno + i,
-mode))
- return 0;
+ function_abi abi = call_insn_abi (p);
+ if (regno >= 0
+ && regno < FIRST_PSEUDO_REGISTER
+ && abi.clobbers_reg_p (mode, regno))
+ return 0;
- if (valueno >= 0 && valueno < FIRST_PSEUDO_REGISTER)
- for (i = 0; i < valuenregs; ++i)
- if (call_used_or_fixed_reg_p (valueno + i)
- || targetm.hard_regno_call_part_clobbered (0, valueno + i,
-mode))
- return 0;
+ if (valueno >= 0
+ && valueno < FIRST_PSEUDO_REGISTER
+ && abi.clobbers_reg_p (mode, valueno))
+ return 0;
}
if (INSN_P (p))
Index: gcc/reload1.c
===
--- gcc/reload1.c 2019-09-11 19:47:32.902202887 +0100
+++ gcc/reload1.c 2019-09-11 19:49:00.273587220 +0100
@@ -42,6 +42,7 @@ Software Foundation; either version 3, o
#include "except.h"
#include "dumpfile.h"
#include "rtl-iter.h"
+#include "function-abi.h"
/* This file contains the reload pass of the compiler, which is
run after register allocation has been done. It checks that
@@ -120,11 +121,6 @@ #define spill_indirect_levels \
This is only valid if reg_reloaded_contents is set and valid. */
static HARD_REG_SET reg_reloaded_dead;
-/* Indicate whether the register's current value is one that is not
- safe to retain across a call, even for registers that are normally
- call-saved. This is only meaningful for members of reg_reloaded_valid. */
-static HARD_REG_SET reg_reloaded_call_part_clobbered;
-
/* Number of spill-regs so far; number of valid elements of spill_regs. */
static int n_spills;
@@ -795,7 +791,7 @@ reload (rtx_insn *first, int global)
if (crtl->saves_all_registers)
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
- if (! call_used_or_fixed_reg_p (i)
+ if (! crtl->abi->clobbers_full_reg_p (i)
&& ! fixed_regs[i]
&& ! LOCAL_REGNO (i))
df_set_regs_ever_live (i, true);
@@ -1908,8 +1904,8 @@ find_reg (class insn_chain *chain, int o
&& (inv_reg_alloc_order[regno]
< inv_reg_alloc_order[best_reg])
#else
- && call_used_or_fixed_reg_p (regno)
- && ! call_used_or_fixed_reg_p (best_reg)
+ && crtl->abi->clobbers_full_reg_p (regno)
+ && !crtl->abi->clobbers_full_reg_p (best_reg)
#endif
))
{
@@ -4464,7 +4460,6 @@ reload_as_needed (int live_known)
reg_last_reload_reg = XCNEWVEC (rtx, max_regno);
INIT_REG_SET (®_has_output_reload);
CLEAR_HARD_REG_SET (reg_reloaded_valid);
- CLEAR_HARD_REG_SET (reg_reloaded_call_part_clobbered);
set_initial_elim_offsets ();
@@ -4786,8 +4781,8
