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Commit 1c9c5e43 by Alan Modra Committed by Alan Modra
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rs6000.c (ALWAYS_RESTORE_ALTIVEC_BEFORE_POP): Define. 

	* config/rs6000/rs6000.c (ALWAYS_RESTORE_ALTIVEC_BEFORE_POP): Define.
	(rs6000_emit_epilogue): Use backchain to restore only when we
	have a large frame.  Make use of frame pointer to restore if we
	have one.  Handle ALWAYS_RESTORE_ALTIVEC_BEFORE_POP.

From-SVN: r134816
parent d4f90ccc
Showing with 65 additions and 21 deletions
gcc/ChangeLog
2008-04-30 Alan Modra <amodra@bigpond.net.au>
* config/rs6000/rs6000.c (ALWAYS_RESTORE_ALTIVEC_BEFORE_POP): Define.
(rs6000_emit_epilogue): Use backchain to restore only when we
have a large frame. Make use of frame pointer to restore if we
have one. Handle ALWAYS_RESTORE_ALTIVEC_BEFORE_POP.
2008-04-29 Paolo Bonzini <bonzini@gnu.org>
* config/avr/avr.md (*sbrx_branch, *sbix_branch, *sbix_branch_tmp):
......
gcc/config/rs6000/rs6000.c
/* Subroutines used for code generation on IBM RS/6000.
Copyright (C) 1991, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
Free Software Foundation, Inc.
Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
......@@ -16244,6 +16244,10 @@ rs6000_output_function_prologue (FILE *file,
rs6000_pic_labelno++;
}
/* Non-zero if vmx regs are restored before the frame pop, zero if
we restore after the pop when possible. */
#define ALWAYS_RESTORE_ALTIVEC_BEFORE_POP 0
/* Emit function epilogue as insns.
At present, dwarf2out_frame_debug_expr doesn't understand
......@@ -16283,13 +16287,18 @@ rs6000_emit_epilogue (int sibcall)
|| crtl->calls_eh_return
|| info->first_fp_reg_save == 64
|| FP_SAVE_INLINE (info->first_fp_reg_save));
use_backchain_to_restore_sp = (frame_pointer_needed
|| cfun->calls_alloca
|| info->total_size > 32767);
using_mtcr_multiple = (rs6000_cpu == PROCESSOR_PPC601
|| rs6000_cpu == PROCESSOR_PPC603
|| rs6000_cpu == PROCESSOR_PPC750
|| optimize_size);
/* Restore via the backchain when we have a large frame, since this
is more efficient than an addis, addi pair. The second condition
here will not trigger at the moment; We don't actually need a
frame pointer for alloca, but the generic parts of the compiler
give us one anyway. */
use_backchain_to_restore_sp = (info->total_size > 32767
|| (cfun->calls_alloca
&& !frame_pointer_needed));
if (WORLD_SAVE_P (info))
{
......@@ -16390,8 +16399,9 @@ rs6000_emit_epilogue (int sibcall)
stack. */
if (TARGET_ALTIVEC_ABI
&& info->altivec_size != 0
&& DEFAULT_ABI != ABI_V4
&& info->altivec_save_offset < (TARGET_32BIT ? -220 : -288))
&& (ALWAYS_RESTORE_ALTIVEC_BEFORE_POP
|| (DEFAULT_ABI != ABI_V4
&& info->altivec_save_offset < (TARGET_32BIT ? -220 : -288))))
{
int i;
......@@ -16402,6 +16412,8 @@ rs6000_emit_epilogue (int sibcall)
gen_rtx_MEM (Pmode, sp_reg_rtx));
sp_offset = 0;
}
else if (frame_pointer_needed)
frame_reg_rtx = hard_frame_pointer_rtx;
for (i = info->first_altivec_reg_save; i <= LAST_ALTIVEC_REGNO; ++i)
if (info->vrsave_mask & ALTIVEC_REG_BIT (i))
......@@ -16426,19 +16438,24 @@ rs6000_emit_epilogue (int sibcall)
if (TARGET_ALTIVEC
&& TARGET_ALTIVEC_VRSAVE
&& info->vrsave_mask != 0
&& DEFAULT_ABI != ABI_V4
&& info->vrsave_save_offset < (TARGET_32BIT ? -220 : -288))
&& (ALWAYS_RESTORE_ALTIVEC_BEFORE_POP
|| (DEFAULT_ABI != ABI_V4
&& info->vrsave_save_offset < (TARGET_32BIT ? -220 : -288))))
{
rtx addr, mem, reg;
if (use_backchain_to_restore_sp
&& frame_reg_rtx == sp_reg_rtx)
if (frame_reg_rtx == sp_reg_rtx)
{
if (use_backchain_to_restore_sp)
{
frame_reg_rtx = gen_rtx_REG (Pmode, 11);
emit_move_insn (frame_reg_rtx,
gen_rtx_MEM (Pmode, sp_reg_rtx));
sp_offset = 0;
}
else if (frame_pointer_needed)
frame_reg_rtx = hard_frame_pointer_rtx;
}
addr = gen_rtx_PLUS (Pmode, frame_reg_rtx,
GEN_INT (info->vrsave_save_offset + sp_offset));
......@@ -16449,17 +16466,11 @@ rs6000_emit_epilogue (int sibcall)
emit_insn (generate_set_vrsave (reg, info, 1));
}
/* If we have a frame pointer, a call to alloca, or a large stack
frame, restore the old stack pointer using the backchain. Otherwise,
we know what size to update it with. */
/* If we have a large stack frame, restore the old stack pointer
using the backchain. */
if (use_backchain_to_restore_sp)
{
if (frame_reg_rtx != sp_reg_rtx)
{
emit_move_insn (sp_reg_rtx, frame_reg_rtx);
frame_reg_rtx = sp_reg_rtx;
}
else
if (frame_reg_rtx == sp_reg_rtx)
{
/* Under V.4, don't reset the stack pointer until after we're done
loading the saved registers. */
......@@ -16470,6 +16481,30 @@ rs6000_emit_epilogue (int sibcall)
gen_rtx_MEM (Pmode, sp_reg_rtx));
sp_offset = 0;
}
else if (ALWAYS_RESTORE_ALTIVEC_BEFORE_POP
&& DEFAULT_ABI == ABI_V4)
/* frame_reg_rtx has been set up by the altivec restore. */
;
else
{
emit_move_insn (sp_reg_rtx, frame_reg_rtx);
frame_reg_rtx = sp_reg_rtx;
}
}
/* If we have a frame pointer, we can restore the old stack pointer
from it. */
else if (frame_pointer_needed)
{
frame_reg_rtx = sp_reg_rtx;
if (DEFAULT_ABI == ABI_V4)
frame_reg_rtx = gen_rtx_REG (Pmode, 11);
emit_insn (TARGET_32BIT
? gen_addsi3 (frame_reg_rtx, hard_frame_pointer_rtx,
GEN_INT (info->total_size))
: gen_adddi3 (frame_reg_rtx, hard_frame_pointer_rtx,
GEN_INT (info->total_size)));
sp_offset = 0;
}
else if (info->push_p
&& DEFAULT_ABI != ABI_V4
......@@ -16484,7 +16519,8 @@ rs6000_emit_epilogue (int sibcall)
}
/* Restore AltiVec registers if we have not done so already. */
if (TARGET_ALTIVEC_ABI
if (!ALWAYS_RESTORE_ALTIVEC_BEFORE_POP
&& TARGET_ALTIVEC_ABI
&& info->altivec_size != 0
&& (DEFAULT_ABI == ABI_V4
|| info->altivec_save_offset >= (TARGET_32BIT ? -220 : -288)))
......@@ -16511,7 +16547,8 @@ rs6000_emit_epilogue (int sibcall)
}
/* Restore VRSAVE if we have not done so already. */
if (TARGET_ALTIVEC
if (!ALWAYS_RESTORE_ALTIVEC_BEFORE_POP
&& TARGET_ALTIVEC
&& TARGET_ALTIVEC_VRSAVE
&& info->vrsave_mask != 0
&& (DEFAULT_ABI == ABI_V4
......
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