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rs6000.h (WORLD_SAVE_P): Define.

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* config/rs6000/rs6000.h (WORLD_SAVE_P): Define.
	* config/rs6000/darwin.h (WORLD_SAVE_P): Define.
	* config/rs6000/rs6000.c (compute_save_world_info): Use WORLD_SAVE_P
	to allow non-darwin ABIs to optimize away code.
	(rs6000_emit_prologue, rs6000_emit_epilogue): Likewise.

From-SVN: r91396
This commit is contained in:
Alan Modra 2004-11-27 22:45:24 +00:00 committed by Alan Modra
parent 51dd24d7d0
commit f57fe06890
4 changed files with 44 additions and 26 deletions

8
gcc/ChangeLog

@ -1,3 +1,11 @@
2004-11-28 Alan Modra <amodra@bigpond.net.au>
* config/rs6000/rs6000.h (WORLD_SAVE_P): Define.
* config/rs6000/darwin.h (WORLD_SAVE_P): Define.
* config/rs6000/rs6000.c (compute_save_world_info): Use WORLD_SAVE_P
to allow non-darwin ABIs to optimize away code.
(rs6000_emit_prologue, rs6000_emit_epilogue): Likewise.
2004-11-27 Kazu Hirata <kazu@cs.umass.edu>
* tree.c (operand_equal_for_phi_arg_p): New.

4
gcc/config/rs6000/darwin.h

@ -208,6 +208,10 @@ do { \
#undef FP_SAVE_INLINE
#define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64)
/* Darwin uses a function call if everything needs to be saved/restored. */
#undef WORLD_SAVE_P
#define WORLD_SAVE_P(INFO) ((INFO)->world_save_p)
/* The assembler wants the alternate register names, but without
leading percent sign. */
#undef REGISTER_NAMES

54
gcc/config/rs6000/rs6000.c

@ -12422,23 +12422,25 @@ compute_vrsave_mask (void)
}
/* For a very restricted set of circumstances, we can cut down the
size of prologs/epilogs by calling our own save/restore-the-world
routines. */
size of prologues/epilogues by calling our own save/restore-the-world
routines. */
static void
compute_save_world_info(rs6000_stack_t *info_ptr)
compute_save_world_info (rs6000_stack_t *info_ptr)
{
info_ptr->world_save_p =
(DEFAULT_ABI == ABI_DARWIN)
&& ! (current_function_calls_setjmp && flag_exceptions)
&& info_ptr->first_fp_reg_save == FIRST_SAVED_FP_REGNO
&& info_ptr->first_gp_reg_save == FIRST_SAVED_GP_REGNO
&& info_ptr->first_altivec_reg_save == FIRST_SAVED_ALTIVEC_REGNO
&& info_ptr->cr_save_p;
info_ptr->world_save_p = 1;
info_ptr->world_save_p
= (WORLD_SAVE_P (info_ptr)
&& DEFAULT_ABI == ABI_DARWIN
&& ! (current_function_calls_setjmp && flag_exceptions)
&& info_ptr->first_fp_reg_save == FIRST_SAVED_FP_REGNO
&& info_ptr->first_gp_reg_save == FIRST_SAVED_GP_REGNO
&& info_ptr->first_altivec_reg_save == FIRST_SAVED_ALTIVEC_REGNO
&& info_ptr->cr_save_p);
/* This will not work in conjunction with sibcalls. Make sure there
are none. (This check is expensive, but seldom executed.) */
if ( info_ptr->world_save_p )
if (WORLD_SAVE_P (info_ptr))
{
rtx insn;
for ( insn = get_last_insn_anywhere (); insn; insn = PREV_INSN (insn))
@ -12450,7 +12452,7 @@ compute_save_world_info(rs6000_stack_t *info_ptr)
}
}
if (info_ptr->world_save_p)
if (WORLD_SAVE_P (info_ptr))
{
/* Even if we're not touching VRsave, make sure there's room on the
stack for it, if it looks like we're calling SAVE_WORLD, which
@ -13862,7 +13864,7 @@ rs6000_emit_prologue (void)
}
/* Handle world saves specially here. */
if (info->world_save_p)
if (WORLD_SAVE_P (info))
{
int i, j, sz;
rtx treg;
@ -13982,7 +13984,7 @@ rs6000_emit_prologue (void)
}
/* Save AltiVec registers if needed. */
if (! info->world_save_p && TARGET_ALTIVEC_ABI && info->altivec_size != 0)
if (!WORLD_SAVE_P (info) && TARGET_ALTIVEC_ABI && info->altivec_size != 0)
{
int i;
@ -14023,7 +14025,7 @@ rs6000_emit_prologue (void)
epilogue. */
if (TARGET_ALTIVEC && TARGET_ALTIVEC_VRSAVE
&& ! info->world_save_p && info->vrsave_mask != 0)
&& !WORLD_SAVE_P (info) && info->vrsave_mask != 0)
{
rtx reg, mem, vrsave;
int offset;
@ -14051,7 +14053,7 @@ rs6000_emit_prologue (void)
}
/* If we use the link register, get it into r0. */
if (! info->world_save_p && info->lr_save_p)
if (!WORLD_SAVE_P (info) && info->lr_save_p)
{
insn = emit_move_insn (gen_rtx_REG (Pmode, 0),
gen_rtx_REG (Pmode, LINK_REGISTER_REGNUM));
@ -14059,7 +14061,7 @@ rs6000_emit_prologue (void)
}
/* If we need to save CR, put it into r12. */
if (! info->world_save_p && info->cr_save_p && frame_reg_rtx != frame_ptr_rtx)
if (!WORLD_SAVE_P (info) && info->cr_save_p && frame_reg_rtx != frame_ptr_rtx)
{
rtx set;
@ -14081,7 +14083,7 @@ rs6000_emit_prologue (void)
/* Do any required saving of fpr's. If only one or two to save, do
it ourselves. Otherwise, call function. */
if (! info->world_save_p && saving_FPRs_inline)
if (!WORLD_SAVE_P (info) && saving_FPRs_inline)
{
int i;
for (i = 0; i < 64 - info->first_fp_reg_save; i++)
@ -14092,7 +14094,7 @@ rs6000_emit_prologue (void)
info->fp_save_offset + sp_offset + 8 * i,
info->total_size);
}
else if (! info->world_save_p && info->first_fp_reg_save != 64)
else if (!WORLD_SAVE_P (info) && info->first_fp_reg_save != 64)
{
int i;
char rname[30];
@ -14128,7 +14130,7 @@ rs6000_emit_prologue (void)
/* Save GPRs. This is done as a PARALLEL if we are using
the store-multiple instructions. */
if (! info->world_save_p && using_store_multiple)
if (!WORLD_SAVE_P (info) && using_store_multiple)
{
rtvec p;
int i;
@ -14150,7 +14152,7 @@ rs6000_emit_prologue (void)
rs6000_frame_related (insn, frame_ptr_rtx, info->total_size,
NULL_RTX, NULL_RTX);
}
else if (! info->world_save_p)
else if (!WORLD_SAVE_P (info))
{
int i;
for (i = 0; i < 32 - info->first_gp_reg_save; i++)
@ -14209,7 +14211,7 @@ rs6000_emit_prologue (void)
/* ??? There's no need to emit actual instructions here, but it's the
easiest way to get the frame unwind information emitted. */
if (! info->world_save_p && current_function_calls_eh_return)
if (!WORLD_SAVE_P (info) && current_function_calls_eh_return)
{
unsigned int i, regno;
@ -14244,7 +14246,7 @@ rs6000_emit_prologue (void)
}
/* Save lr if we used it. */
if (! info->world_save_p && info->lr_save_p)
if (!WORLD_SAVE_P (info) && info->lr_save_p)
{
rtx addr = gen_rtx_PLUS (Pmode, frame_reg_rtx,
GEN_INT (info->lr_save_offset + sp_offset));
@ -14259,7 +14261,7 @@ rs6000_emit_prologue (void)
}
/* Save CR if we use any that must be preserved. */
if (! info->world_save_p && info->cr_save_p)
if (!WORLD_SAVE_P (info) && info->cr_save_p)
{
rtx addr = gen_rtx_PLUS (Pmode, frame_reg_rtx,
GEN_INT (info->cr_save_offset + sp_offset));
@ -14292,7 +14294,7 @@ rs6000_emit_prologue (void)
/* Update stack and set back pointer unless this is V.4,
for which it was done previously. */
if (! info->world_save_p && info->push_p
if (!WORLD_SAVE_P (info) && info->push_p
&& !(DEFAULT_ABI == ABI_V4 || current_function_calls_eh_return))
rs6000_emit_allocate_stack (info->total_size, FALSE);
@ -14461,7 +14463,7 @@ rs6000_emit_epilogue (int sibcall)
|| rs6000_cpu == PROCESSOR_PPC750
|| optimize_size);
if (info->world_save_p)
if (WORLD_SAVE_P (info))
{
int i, j;
char rname[30];

4
gcc/config/rs6000/rs6000.h

@ -1627,6 +1627,10 @@ extern enum rs6000_abi rs6000_current_abi; /* available for use by subtarget */
#define CALL_LONG 0x00000008 /* always call indirect */
#define CALL_LIBCALL 0x00000010 /* libcall */
/* We don't have prologue and epilogue functions to save/restore
everything for most ABIs. */
#define WORLD_SAVE_P(INFO) 0
/* 1 if N is a possible register number for a function value
as seen by the caller.