Remove call_really_used_regs

After previous patches, it's now possible for call_used_regs to be
the "real" set of call-clobbered registers, without any special
handling for fixed registers.  This patch therefore removes the
separate call_really_used_regs and updates the targets that define
CALL_REALLY_USED_REGISTERS so that they handle call_used_regs in
the same way that they used to handle call_really_used_regs.

With this change, it's no longer necessary for targets that define
CALL_REALLY_USED_REGISTERS to define CALL_USED_REGISTER as well.

2019-09-10  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* doc/tm.texi.in: Document that exactly one of CALL_USED_REGISTERS
	and CALL_REALLY_USED_REGISTERS must be defined, and that
	CALL_REALLY_USED_REGISTERS is preferred.
	* doc/tm.texi: Regenerate.
	* hard-reg-set.h (target_hard_regs::x_call_really_used_regs): Delete.
	(call_really_used_regs): Likewise.
	* reginfo.c: Raise an #error if both CALL_USED_REGISTERS and
	CALL_REALLY_USED_REGISTERS are defined.
	(initial_call_used_regs): Use CALL_REALLY_USED_REGISTERS as the
	initial value if defined.
	(initial_call_really_used_regs): Delete.
	(saved_call_really_used_regs): Likewise.
	(CALL_REALLY_USED_REGNO_P): Likewise.
	(init_reg_sets): Remove handling of call_really_used_regs.
	(save_register_info, restore_register_info, globalize_reg): Likewise.
	(init_reg_sets_1): Likewise.  Use call_used_regs instead of
	CALL_REALLY_USED_REGNO_P.  Don't set call_used_regs for registers
	outside operand_reg_set.
	(fix_register): Don't change call_used_regs if
	CALL_REALLY_USED_REGISTERS is defined.
	* config/csky/csky.h (CALL_USED_REGISTERS): Delete.
	* config/csky/csky.c (get_csky_live_regs): Use call_used_regs
	instead of call_really_used_regs.
	(csky_conditional_register_usage): Remove the old handling of
	call_used_regs and change the handling of call_really_used_regs
	to use call_used_regs instead.
	* config/ia64/ia64.h (CALL_USED_REGISTERS): Delete.
	* config/ia64/ia64.c (fix_range): Don't set call_used_regs when
	making a register fixed.
	* config/m32r/m32r.h (CALL_USED_REGISTERS): Delete.
	* config/m32r/m32r.c (MUST_SAVE_REGISTER): Use call_used_regs
	instead of call_really_used_regs.
	(m32r_conditional_register_usage): Don't set call_used_regs when
	making a register fixed.
	* config/mips/mips.h (CALL_USED_REGISTERS): Delete.
	* config/mips/mips.c (mips_global_pointer): Use call_used_regs
	instead of call_really_used_regs.
	(mips_interrupt_extra_call_saved_reg_p): Likewise.
	(mips_cfun_call_saved_reg_p): Likewise.
	(mips_swap_registers): Remove the old handling of call_used_regs
	and change the handling of call_really_used_regs to use call_used_regs
	instead.
	(mips_conditional_register_usage): Likewise.
	* config/mn10300/mn10300.h (CALL_USED_REGISTERS): Delete.
	* config/mn10300/mn10300.c (fp_regs_to_save): Use call_used_regs
	instead of call_really_used_regs.
	(mn10300_get_live_callee_saved_regs): Likewise.
	(mn10300_expand_prologue, mn10300_expand_epilogue): Likewise.
	(mn10300_conditional_register_usage): Don't set call_used_regs when
	making a register fixed.
	* config/rs6000/rs6000.h (CALL_USED_REGISTERS): Delete.
	* config/rs6000/rs6000.c (rs6000_conditional_register_usage):
	Remove the old handling of call_used_regs and change the handling
	of call_really_used_regs to use call_used_regs instead.
	* config/s390/s390.h (CALL_USED_REGISTERS): Delete.
	* config/s390/s390.c (s390_regs_ever_clobbered): Use call_used_regs
	instead of call_really_used_regs.
	(s390_register_info_gprtofpr, s390_register_info): Likewise.
	(s390_hard_regno_rename_ok, s390_hard_regno_scratch_ok): Likewise.
	(s390_emit_prologue, s300_set_up_by_prologue): Likewise.
	(s390_can_use_return_insn, s390_optimize_prologue): Likewise.
	(s390_conditional_register_usage): Remove the old handling of
	call_used_regs and change the handling of call_really_used_regs
	to use call_used_regs instead.
	* config/sh/sh.h (CALL_USED_REGISTERS): Delete.
	* config/sh/sh.c (output_stack_adjust, calc_live_regs): Likewise.
	(sh_fix_range, reg_unused_after): Likewise.
	(sh_conditional_register_usage): Remove the old handling of
	call_used_regs and change the handling of call_really_used_regs
	to use call_used_regs instead.
	* config/sparc/sparc.h (CALL_USED_REGISTERS): Delete.
	* config/sparc/sparc.c (sparc_conditional_register_usage): Don't set
	call_used_regs when making a register fixed.
	* config/tilegx/tilegx.h (CALL_USED_REGISTERS): Delete.
	* config/tilegx/tilegx.c (tilegx_conditional_register_usage): Don't set
	call_used_regs when making a register fixed.
	* config/tilepro/tilepro.h (CALL_USED_REGISTERS): Delete.
	* config/tilepro/tilepro.c (tilepro_conditional_register_usage): Don't
	set call_used_regs when making a register fixed.
	* config/visium/visium.h (CALL_USED_REGISTERS): Delete.
	* config/visium/visium.c (visium_conditional_register_usage): Remove
	the old handling of call_used_regs and change the handling of
	call_really_used_regs to use call_used_regs instead.

From-SVN: r275605

2 files changed, 14 insertions, 35 deletions

diff --git a/gcc/config/visium/visium.c b/gcc/config/visium/visium.c
index 367e1e5..8477008 100644
--- a/gcc/config/visium/visium.c
+++ b/gcc/config/visium/visium.c
@@ -754,20 +754,20 @@ visium_conditional_register_usage (void)
     {
       if (visium_cpu_and_features == PROCESSOR_GR5)
 	{
-	  fixed_regs[24] = call_used_regs[24] = 1;
-	  fixed_regs[25] = call_used_regs[25] = 1;
-	  fixed_regs[26] = call_used_regs[26] = 1;
-	  fixed_regs[27] = call_used_regs[27] = 1;
-	  fixed_regs[28] = call_used_regs[28] = 1;
-	  call_really_used_regs[24] = 0;
-	  call_really_used_regs[25] = 0;
-	  call_really_used_regs[26] = 0;
-	  call_really_used_regs[27] = 0;
-	  call_really_used_regs[28] = 0;
+	  fixed_regs[24] = 1;
+	  fixed_regs[25] = 1;
+	  fixed_regs[26] = 1;
+	  fixed_regs[27] = 1;
+	  fixed_regs[28] = 1;
+	  call_used_regs[24] = 0;
+	  call_used_regs[25] = 0;
+	  call_used_regs[26] = 0;
+	  call_used_regs[27] = 0;
+	  call_used_regs[28] = 0;
 	}
 
-      fixed_regs[31] = call_used_regs[31] = 1;
-      call_really_used_regs[31] = 0;
+      fixed_regs[31] = 1;
+      call_used_regs[31] = 0;
 
       /* We also need to change the long-branch register.  */
       if (visium_cpu_and_features == PROCESSOR_GR5)
@@ -781,8 +781,8 @@ visium_conditional_register_usage (void)
     {
       for (int i = FP_FIRST_REGNUM; i <= FP_LAST_REGNUM; i++)
 	{
-	  fixed_regs[i] = call_used_regs[i] = 1;
-	  call_really_used_regs[i] = 0;
+	  fixed_regs[i] = 1;
+	  call_used_regs[i] = 0;
 	}
     }
 }
diff --git a/gcc/config/visium/visium.h b/gcc/config/visium/visium.h
index c9376b2..0d7ae0f 100644
--- a/gcc/config/visium/visium.h
+++ b/gcc/config/visium/visium.h
@@ -488,27 +488,6 @@
    0, 0, 0, 0, 0, 0, 0, 0, /* f8 .. f15 */     \
    1, 1, 1 }               /* flags, arg, frame */
 
-/* `CALL_USED_REGISTERS'
-
-   Like `FIXED_REGISTERS' but has 1 for each register that is
-   clobbered (in general) by function calls as well as for fixed
-   registers.  This macro therefore identifies the registers that are
-   not available for general allocation of values that must live
-   across function calls.
-
-   If a register has 0 in `CALL_USED_REGISTERS', the compiler
-   automatically saves it on function entry and restores it on
-   function exit, if the register is used within the function.  */
-#define CALL_USED_REGISTERS \
- { 1, 1, 1, 1, 1, 1, 1, 1, /* r0 .. r7 */      \
-   1, 1, 1, 0, 0, 0, 0, 0, /* r8 .. r15 */     \
-   0, 0, 0, 0, 1, 1, 0, 1, /* r16 .. r23 */    \
-   1, 1, 1, 1, 1, 1, 1, 1, /* r24 .. r31 */    \
-   1, 1,                   /* mdb, mdc */      \
-   1, 1, 1, 1, 1, 1, 1, 1, /* f0 .. f7 */      \
-   1, 0, 0, 0, 0, 0, 0, 0, /* f8 .. f15 */     \
-   1, 1, 1 }               /* flags, arg, frame */
-
 /* Like `CALL_USED_REGISTERS' except this macro doesn't require that
    the entire set of `FIXED_REGISTERS' be included.
    (`CALL_USED_REGISTERS' must be a superset of `FIXED_REGISTERS').