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riscv-gcc-1
Commit e1f1d97f by Sa Liu Committed by Ben Elliston
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spu.h (STACK_SAVE_AREA): Use VOIDmode for SAVE_FUNCTION... 

	* spu.h (STACK_SAVE_AREA): Use VOIDmode for SAVE_FUNCTION, SImode
	for SAVE_NONLOCAL and Pmode for any other save level.
	* spu-protos.h (spu_restore_stack_block): Declare.
	* spu.md (save_stack_block): Remove.
	(restore_stack_block): Call spu_restore_stack_block.
	* spu.c (spu_restore_stack_block): New function.
	(spu_expand_epilogue): Remove old comment.

Co-Authored-By: Ben Elliston <bje@au.ibm.com>

From-SVN: r120633
parent 0b30ba3b
Showing with 64 additions and 26 deletions
gcc/ChangeLog
2007-01-10 Sa Liu <saliu@de.ibm.com>
Ben Elliston <bje@au.ibm.com>
* spu.h (STACK_SAVE_AREA): Use VOIDmode for SAVE_FUNCTION, SImode
for SAVE_NONLOCAL and Pmode for any other save level.
* spu-protos.h (spu_restore_stack_block): Declare.
* spu.md (save_stack_block): Remove.
(restore_stack_block): Call spu_restore_stack_block.
* spu.c (spu_restore_stack_block): New function.
(spu_expand_epilogue): Remove old comment.
2007-01-09 Zdenek Dvorak <dvorakz@suse.cz>
PR tree-optimization/30322
......
gcc/config/spu/spu-protos.h
/* Copyright (C) 2006 Free Software Foundation, Inc.
/* Copyright (C) 2006, 2007 Free Software Foundation, Inc.
This file is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
......@@ -78,6 +78,7 @@ extern rtx array_to_constant (enum machine_mode mode, unsigned char *arr);
extern enum machine_mode spu_eh_return_filter_mode (void);
extern void spu_allocate_stack (rtx op0, rtx op1);
extern void spu_restore_stack_nonlocal (rtx op0, rtx op1);
extern void spu_restore_stack_block (rtx op0, rtx op1);
extern rtx spu_gen_subreg (enum machine_mode mode, rtx x);
extern int spu_safe_dma(HOST_WIDE_INT channel);
extern void spu_builtin_splats (rtx ops[]);
......
gcc/config/spu/spu.c
/* Copyright (C) 2006 Free Software Foundation, Inc.
/* Copyright (C) 2006, 2007 Free Software Foundation, Inc.
This file is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
......@@ -1702,8 +1702,6 @@ spu_expand_epilogue (bool sibcall_p)
if (total_size > 0)
{
if (current_function_calls_alloca)
/* Load it from the back chain because our save_stack_block and
restore_stack_block do nothing. */
frame_emit_load (STACK_POINTER_REGNUM, sp_reg, 0);
else
frame_emit_add_imm (sp_reg, sp_reg, total_size, scratch_reg_0);
......@@ -4306,6 +4304,32 @@ spu_init_builtins (void)
}
}
void
spu_restore_stack_block (rtx op0 ATTRIBUTE_UNUSED, rtx op1)
{
static unsigned char arr[16] =
{ 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3 };
rtx temp = gen_reg_rtx (Pmode);
rtx temp2 = gen_reg_rtx (V4SImode);
rtx temp3 = gen_reg_rtx (V4SImode);
rtx pat = gen_reg_rtx (TImode);
rtx sp = gen_rtx_REG (V4SImode, STACK_POINTER_REGNUM);
emit_move_insn (pat, array_to_constant (TImode, arr));
/* Restore the sp. */
emit_move_insn (temp, op1);
emit_move_insn (temp2, gen_frame_mem (V4SImode, stack_pointer_rtx));
/* Compute available stack size for sp. */
emit_insn (gen_subsi3 (temp, temp, stack_pointer_rtx));
emit_insn (gen_shufb (temp3, temp, temp, pat));
emit_insn (gen_addv4si3 (sp, sp, temp3));
emit_move_insn (gen_frame_mem (V4SImode, stack_pointer_rtx), temp2);
}
int
spu_safe_dma (HOST_WIDE_INT channel)
{
......
gcc/config/spu/spu.h
......@@ -96,7 +96,10 @@ extern const char *spu_fixed_range_string;
#define MAX_FIXED_MODE_SIZE 128
#define STACK_SAVEAREA_MODE(save_level) SImode
#define STACK_SAVEAREA_MODE(save_level) \
(save_level == SAVE_FUNCTION ? VOIDmode \
: save_level == SAVE_NONLOCAL ? SImode \
: Pmode)
#define STACK_SIZE_MODE SImode
......
gcc/config/spu/spu.md
;; Copyright (C) 2006 Free Software Foundation, Inc.
;; Copyright (C) 2006, 2007 Free Software Foundation, Inc.
;; This file is free software; you can redistribute it and/or modify it under
;; the terms of the GNU General Public License as published by the Free
......@@ -3116,16 +3116,19 @@ selb\t%0,%4,%0,%3"
"spu_allocate_stack (operands[0], operands[1]); DONE;")
;; These patterns say how to save and restore the stack pointer. We need not
;; save the stack pointer at function or block level since we are careful to
;; preserve the backchain. Doing nothing at block level means the stack space
;; is allocated until the end of the function. This is currently safe to do
;; because gcc uses the frame pointer for the whole function, so the worst that
;; happens is wasted stack space. That could be bad if a VLA is declared in a
;; loop, because new space will be allocated every iteration, but users can
;; work around that case. Ideally we could detect when we are in a loop and
;; generate the more complicated code in that case.
;; save the stack pointer at function level since we are careful to preserve
;; the backchain.
;;
;; At block level the stack pointer is saved and restored, so that the
;; stack space allocated within a block is deallocated when leaving
;; block scope. By default, according to the SPU ABI, the stack
;; pointer and available stack size are saved in a register. Upon
;; restoration, the stack pointer is simply copied back, and the
;; current available stack size is calculated against the restored
;; stack pointer.
;;
;; For nonlocal gotos, we must save both the stack pointer and its
;; For nonlocal gotos, we must save the stack pointer and its
;; backchain and restore both. Note that in the nonlocal case, the
;; save area is a memory location.
......@@ -3141,19 +3144,15 @@ selb\t%0,%4,%0,%3"
""
"DONE;")
(define_expand "save_stack_block"
[(match_operand 0 "general_operand" "")
(match_operand 1 "general_operand" "")]
""
"DONE; ")
(define_expand "restore_stack_block"
[(use (match_operand 0 "spu_reg_operand" ""))
(set (match_dup 2) (match_dup 3))
(set (match_dup 0) (match_operand 1 "spu_reg_operand" ""))
(set (match_dup 3) (match_dup 2))]
[(match_operand 0 "spu_reg_operand" "")
(match_operand 1 "memory_operand" "")]
""
"DONE;")
"
{
spu_restore_stack_block (operands[0], operands[1]);
DONE;
}")
(define_expand "save_stack_nonlocal"
[(match_operand 0 "memory_operand" "")
......
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