rs6000.h (WORLD_SAVE_P): Define.
* 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
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@ -1,3 +1,11 @@
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2004-11-28 Alan Modra <amodra@bigpond.net.au>
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* config/rs6000/rs6000.h (WORLD_SAVE_P): Define.
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* config/rs6000/darwin.h (WORLD_SAVE_P): Define.
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* config/rs6000/rs6000.c (compute_save_world_info): Use WORLD_SAVE_P
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to allow non-darwin ABIs to optimize away code.
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(rs6000_emit_prologue, rs6000_emit_epilogue): Likewise.
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2004-11-27 Kazu Hirata <kazu@cs.umass.edu>
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* tree.c (operand_equal_for_phi_arg_p): New.
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@ -208,6 +208,10 @@ do { \
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#undef FP_SAVE_INLINE
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#define FP_SAVE_INLINE(FIRST_REG) ((FIRST_REG) < 64)
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/* Darwin uses a function call if everything needs to be saved/restored. */
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#undef WORLD_SAVE_P
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#define WORLD_SAVE_P(INFO) ((INFO)->world_save_p)
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/* The assembler wants the alternate register names, but without
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leading percent sign. */
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#undef REGISTER_NAMES
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@ -12422,23 +12422,25 @@ compute_vrsave_mask (void)
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}
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/* For a very restricted set of circumstances, we can cut down the
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size of prologs/epilogs by calling our own save/restore-the-world
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routines. */
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size of prologues/epilogues by calling our own save/restore-the-world
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routines. */
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static void
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compute_save_world_info(rs6000_stack_t *info_ptr)
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compute_save_world_info (rs6000_stack_t *info_ptr)
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{
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info_ptr->world_save_p =
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(DEFAULT_ABI == ABI_DARWIN)
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&& ! (current_function_calls_setjmp && flag_exceptions)
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&& info_ptr->first_fp_reg_save == FIRST_SAVED_FP_REGNO
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&& info_ptr->first_gp_reg_save == FIRST_SAVED_GP_REGNO
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&& info_ptr->first_altivec_reg_save == FIRST_SAVED_ALTIVEC_REGNO
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&& info_ptr->cr_save_p;
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info_ptr->world_save_p = 1;
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info_ptr->world_save_p
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= (WORLD_SAVE_P (info_ptr)
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&& DEFAULT_ABI == ABI_DARWIN
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&& ! (current_function_calls_setjmp && flag_exceptions)
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&& info_ptr->first_fp_reg_save == FIRST_SAVED_FP_REGNO
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&& info_ptr->first_gp_reg_save == FIRST_SAVED_GP_REGNO
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&& info_ptr->first_altivec_reg_save == FIRST_SAVED_ALTIVEC_REGNO
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&& info_ptr->cr_save_p);
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/* This will not work in conjunction with sibcalls. Make sure there
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are none. (This check is expensive, but seldom executed.) */
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if ( info_ptr->world_save_p )
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if (WORLD_SAVE_P (info_ptr))
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{
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rtx insn;
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for ( insn = get_last_insn_anywhere (); insn; insn = PREV_INSN (insn))
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@ -12450,7 +12452,7 @@ compute_save_world_info(rs6000_stack_t *info_ptr)
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}
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}
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if (info_ptr->world_save_p)
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if (WORLD_SAVE_P (info_ptr))
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{
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/* Even if we're not touching VRsave, make sure there's room on the
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stack for it, if it looks like we're calling SAVE_WORLD, which
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@ -13862,7 +13864,7 @@ rs6000_emit_prologue (void)
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}
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/* Handle world saves specially here. */
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if (info->world_save_p)
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if (WORLD_SAVE_P (info))
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{
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int i, j, sz;
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rtx treg;
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@ -13982,7 +13984,7 @@ rs6000_emit_prologue (void)
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}
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/* Save AltiVec registers if needed. */
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if (! info->world_save_p && TARGET_ALTIVEC_ABI && info->altivec_size != 0)
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if (!WORLD_SAVE_P (info) && TARGET_ALTIVEC_ABI && info->altivec_size != 0)
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{
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int i;
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@ -14023,7 +14025,7 @@ rs6000_emit_prologue (void)
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epilogue. */
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if (TARGET_ALTIVEC && TARGET_ALTIVEC_VRSAVE
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&& ! info->world_save_p && info->vrsave_mask != 0)
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&& !WORLD_SAVE_P (info) && info->vrsave_mask != 0)
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{
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rtx reg, mem, vrsave;
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int offset;
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@ -14051,7 +14053,7 @@ rs6000_emit_prologue (void)
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}
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/* If we use the link register, get it into r0. */
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if (! info->world_save_p && info->lr_save_p)
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if (!WORLD_SAVE_P (info) && info->lr_save_p)
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{
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insn = emit_move_insn (gen_rtx_REG (Pmode, 0),
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gen_rtx_REG (Pmode, LINK_REGISTER_REGNUM));
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@ -14059,7 +14061,7 @@ rs6000_emit_prologue (void)
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}
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/* If we need to save CR, put it into r12. */
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if (! info->world_save_p && info->cr_save_p && frame_reg_rtx != frame_ptr_rtx)
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if (!WORLD_SAVE_P (info) && info->cr_save_p && frame_reg_rtx != frame_ptr_rtx)
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{
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rtx set;
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@ -14081,7 +14083,7 @@ rs6000_emit_prologue (void)
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/* Do any required saving of fpr's. If only one or two to save, do
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it ourselves. Otherwise, call function. */
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if (! info->world_save_p && saving_FPRs_inline)
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if (!WORLD_SAVE_P (info) && saving_FPRs_inline)
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{
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int i;
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for (i = 0; i < 64 - info->first_fp_reg_save; i++)
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@ -14092,7 +14094,7 @@ rs6000_emit_prologue (void)
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info->fp_save_offset + sp_offset + 8 * i,
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info->total_size);
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}
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else if (! info->world_save_p && info->first_fp_reg_save != 64)
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else if (!WORLD_SAVE_P (info) && info->first_fp_reg_save != 64)
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{
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int i;
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char rname[30];
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@ -14128,7 +14130,7 @@ rs6000_emit_prologue (void)
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/* Save GPRs. This is done as a PARALLEL if we are using
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the store-multiple instructions. */
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if (! info->world_save_p && using_store_multiple)
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if (!WORLD_SAVE_P (info) && using_store_multiple)
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{
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rtvec p;
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int i;
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@ -14150,7 +14152,7 @@ rs6000_emit_prologue (void)
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rs6000_frame_related (insn, frame_ptr_rtx, info->total_size,
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NULL_RTX, NULL_RTX);
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}
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else if (! info->world_save_p)
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else if (!WORLD_SAVE_P (info))
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{
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int i;
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for (i = 0; i < 32 - info->first_gp_reg_save; i++)
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@ -14209,7 +14211,7 @@ rs6000_emit_prologue (void)
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/* ??? There's no need to emit actual instructions here, but it's the
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easiest way to get the frame unwind information emitted. */
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if (! info->world_save_p && current_function_calls_eh_return)
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if (!WORLD_SAVE_P (info) && current_function_calls_eh_return)
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{
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unsigned int i, regno;
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}
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/* Save lr if we used it. */
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if (! info->world_save_p && info->lr_save_p)
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if (!WORLD_SAVE_P (info) && info->lr_save_p)
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{
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rtx addr = gen_rtx_PLUS (Pmode, frame_reg_rtx,
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GEN_INT (info->lr_save_offset + sp_offset));
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}
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/* Save CR if we use any that must be preserved. */
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if (! info->world_save_p && info->cr_save_p)
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if (!WORLD_SAVE_P (info) && info->cr_save_p)
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{
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rtx addr = gen_rtx_PLUS (Pmode, frame_reg_rtx,
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GEN_INT (info->cr_save_offset + sp_offset));
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@ -14292,7 +14294,7 @@ rs6000_emit_prologue (void)
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/* Update stack and set back pointer unless this is V.4,
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for which it was done previously. */
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if (! info->world_save_p && info->push_p
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if (!WORLD_SAVE_P (info) && info->push_p
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&& !(DEFAULT_ABI == ABI_V4 || current_function_calls_eh_return))
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rs6000_emit_allocate_stack (info->total_size, FALSE);
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@ -14461,7 +14463,7 @@ rs6000_emit_epilogue (int sibcall)
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|| rs6000_cpu == PROCESSOR_PPC750
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|| optimize_size);
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if (info->world_save_p)
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if (WORLD_SAVE_P (info))
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{
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int i, j;
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char rname[30];
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@ -1627,6 +1627,10 @@ extern enum rs6000_abi rs6000_current_abi; /* available for use by subtarget */
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#define CALL_LONG 0x00000008 /* always call indirect */
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#define CALL_LIBCALL 0x00000010 /* libcall */
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/* We don't have prologue and epilogue functions to save/restore
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everything for most ABIs. */
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#define WORLD_SAVE_P(INFO) 0
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/* 1 if N is a possible register number for a function value
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as seen by the caller.
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