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Commit 4e9a2848 by Chung-Ju Wu Committed by Chung-Ju Wu
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[NDS32] Refine the implementation and consider CFA restore information for stack push/pop multiple. 

	* config/nds32/nds32.c (nds32_gen_stack_push_multiple): Rename to ...
	(nds32_emit_stack_push_multiple): ... this.
	(nds32_gen_stack_pop_multiple): Rename to ...
	(nds32_emit_stack_pop_multiple): ... this and consider CFA restore
	information.

From-SVN: r214851
parent b7d19263
Showing with 69 additions and 36 deletions
gcc/ChangeLog
2014-09-03 Chung-Ju Wu <jasonwucj@gmail.com>
* config/nds32/nds32.c (nds32_gen_stack_push_multiple): Rename to ...
(nds32_emit_stack_push_multiple): ... this.
(nds32_gen_stack_pop_multiple): Rename to ...
(nds32_emit_stack_pop_multiple): ... this and consider CFA restore
information.
2014-09-03 Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
PR target/61078
gcc/config/nds32/nds32.c
......@@ -347,15 +347,15 @@ nds32_compute_stack_frame (void)
The overall concept are:
"push registers to memory",
"adjust stack pointer". */
static rtx
nds32_gen_stack_push_multiple (rtx Rb, rtx Re,
rtx En4 ATTRIBUTE_UNUSED)
static void
nds32_emit_stack_push_multiple (rtx Rb, rtx Re, rtx En4)
{
int regno;
int extra_count;
int num_use_regs;
int par_index;
int offset;
int save_fp, save_gp, save_lp;
rtx reg;
rtx mem;
......@@ -382,13 +382,18 @@ nds32_gen_stack_push_multiple (rtx Rb, rtx Re,
(set (reg:SI SP_REGNUM)
(plus (reg:SI SP_REGNUM) (const_int -32)))]) */
/* Determine whether we need to save $fp, $gp, or $lp. */
save_fp = INTVAL (En4) & 0x8;
save_gp = INTVAL (En4) & 0x4;
save_lp = INTVAL (En4) & 0x2;
/* Calculate the number of registers that will be pushed. */
extra_count = 0;
if (cfun->machine->fp_size)
if (save_fp)
extra_count++;
if (cfun->machine->gp_size)
if (save_gp)
extra_count++;
if (cfun->machine->lp_size)
if (save_lp)
extra_count++;
/* Note that Rb and Re may be SP_REGNUM. DO NOT count it in. */
if (REGNO (Rb) == SP_REGNUM && REGNO (Re) == SP_REGNUM)
......@@ -411,7 +416,7 @@ nds32_gen_stack_push_multiple (rtx Rb, rtx Re,
/* Rb and Re may be SP_REGNUM.
We need to break this loop immediately. */
if (regno == SP_REGNUM)
break;
break;
reg = gen_rtx_REG (SImode, regno);
mem = gen_frame_mem (SImode, plus_constant (Pmode,
......@@ -425,7 +430,7 @@ nds32_gen_stack_push_multiple (rtx Rb, rtx Re,
}
/* Create (set mem fp), (set mem gp), and (set mem lp) if necessary. */
if (cfun->machine->fp_size)
if (save_fp)
{
reg = gen_rtx_REG (SImode, FP_REGNUM);
mem = gen_frame_mem (SImode, plus_constant (Pmode,
......@@ -437,7 +442,7 @@ nds32_gen_stack_push_multiple (rtx Rb, rtx Re,
offset = offset + 4;
par_index++;
}
if (cfun->machine->gp_size)
if (save_gp)
{
reg = gen_rtx_REG (SImode, GP_REGNUM);
mem = gen_frame_mem (SImode, plus_constant (Pmode,
......@@ -449,7 +454,7 @@ nds32_gen_stack_push_multiple (rtx Rb, rtx Re,
offset = offset + 4;
par_index++;
}
if (cfun->machine->lp_size)
if (save_lp)
{
reg = gen_rtx_REG (SImode, LP_REGNUM);
mem = gen_frame_mem (SImode, plus_constant (Pmode,
......@@ -473,7 +478,12 @@ nds32_gen_stack_push_multiple (rtx Rb, rtx Re,
XVECEXP (parallel_insn, 0, par_index) = adjust_sp_rtx;
RTX_FRAME_RELATED_P (adjust_sp_rtx) = 1;
return parallel_insn;
parallel_insn = emit_insn (parallel_insn);
/* The insn rtx 'parallel_insn' will change frame layout.
We need to use RTX_FRAME_RELATED_P so that GCC is able to
generate CFI (Call Frame Information) stuff. */
RTX_FRAME_RELATED_P (parallel_insn) = 1;
}
/* Function to create a parallel rtx pattern
......@@ -481,21 +491,22 @@ nds32_gen_stack_push_multiple (rtx Rb, rtx Re,
The overall concept are:
"pop registers from memory",
"adjust stack pointer". */
static rtx
nds32_gen_stack_pop_multiple (rtx Rb, rtx Re,
rtx En4 ATTRIBUTE_UNUSED)
static void
nds32_emit_stack_pop_multiple (rtx Rb, rtx Re, rtx En4)
{
int regno;
int extra_count;
int num_use_regs;
int par_index;
int offset;
int save_fp, save_gp, save_lp;
rtx reg;
rtx mem;
rtx pop_rtx;
rtx adjust_sp_rtx;
rtx parallel_insn;
rtx dwarf = NULL_RTX;
/* We need to provide a customized rtx which contains
necessary information for data analysis,
......@@ -516,13 +527,18 @@ nds32_gen_stack_pop_multiple (rtx Rb, rtx Re,
(set (reg:SI SP_REGNUM)
(plus (reg:SI SP_REGNUM) (const_int 32)))]) */
/* Determine whether we need to restore $fp, $gp, or $lp. */
save_fp = INTVAL (En4) & 0x8;
save_gp = INTVAL (En4) & 0x4;
save_lp = INTVAL (En4) & 0x2;
/* Calculate the number of registers that will be poped. */
extra_count = 0;
if (cfun->machine->fp_size)
if (save_fp)
extra_count++;
if (cfun->machine->gp_size)
if (save_gp)
extra_count++;
if (cfun->machine->lp_size)
if (save_lp)
extra_count++;
/* Note that Rb and Re may be SP_REGNUM. DO NOT count it in. */
if (REGNO (Rb) == SP_REGNUM && REGNO (Re) == SP_REGNUM)
......@@ -545,7 +561,7 @@ nds32_gen_stack_pop_multiple (rtx Rb, rtx Re,
/* Rb and Re may be SP_REGNUM.
We need to break this loop immediately. */
if (regno == SP_REGNUM)
break;
break;
reg = gen_rtx_REG (SImode, regno);
mem = gen_frame_mem (SImode, plus_constant (Pmode,
......@@ -556,10 +572,12 @@ nds32_gen_stack_pop_multiple (rtx Rb, rtx Re,
RTX_FRAME_RELATED_P (pop_rtx) = 1;
offset = offset + 4;
par_index++;
dwarf = alloc_reg_note (REG_CFA_RESTORE, reg, dwarf);
}
/* Create (set fp mem), (set gp mem), and (set lp mem) if necessary. */
if (cfun->machine->fp_size)
if (save_fp)
{
reg = gen_rtx_REG (SImode, FP_REGNUM);
mem = gen_frame_mem (SImode, plus_constant (Pmode,
......@@ -570,8 +588,10 @@ nds32_gen_stack_pop_multiple (rtx Rb, rtx Re,
RTX_FRAME_RELATED_P (pop_rtx) = 1;
offset = offset + 4;
par_index++;
dwarf = alloc_reg_note (REG_CFA_RESTORE, reg, dwarf);
}
if (cfun->machine->gp_size)
if (save_gp)
{
reg = gen_rtx_REG (SImode, GP_REGNUM);
mem = gen_frame_mem (SImode, plus_constant (Pmode,
......@@ -582,8 +602,10 @@ nds32_gen_stack_pop_multiple (rtx Rb, rtx Re,
RTX_FRAME_RELATED_P (pop_rtx) = 1;
offset = offset + 4;
par_index++;
dwarf = alloc_reg_note (REG_CFA_RESTORE, reg, dwarf);
}
if (cfun->machine->lp_size)
if (save_lp)
{
reg = gen_rtx_REG (SImode, LP_REGNUM);
mem = gen_frame_mem (SImode, plus_constant (Pmode,
......@@ -594,6 +616,8 @@ nds32_gen_stack_pop_multiple (rtx Rb, rtx Re,
RTX_FRAME_RELATED_P (pop_rtx) = 1;
offset = offset + 4;
par_index++;
dwarf = alloc_reg_note (REG_CFA_RESTORE, reg, dwarf);
}
/* Create (set sp sp+x). */
......@@ -604,9 +628,19 @@ nds32_gen_stack_pop_multiple (rtx Rb, rtx Re,
stack_pointer_rtx,
plus_constant (Pmode, stack_pointer_rtx, offset));
XVECEXP (parallel_insn, 0, par_index) = adjust_sp_rtx;
RTX_FRAME_RELATED_P (adjust_sp_rtx) = 1;
return parallel_insn;
/* Tell gcc we adjust SP in this insn. */
dwarf = alloc_reg_note (REG_CFA_ADJUST_CFA, copy_rtx (adjust_sp_rtx), dwarf);
parallel_insn = emit_insn (parallel_insn);
/* The insn rtx 'parallel_insn' will change frame layout.
We need to use RTX_FRAME_RELATED_P so that GCC is able to
generate CFI (Call Frame Information) stuff. */
RTX_FRAME_RELATED_P (parallel_insn) = 1;
/* Add CFI info by manual. */
REG_NOTES (parallel_insn) = dwarf;
}
/* Function to create a parallel rtx pattern
......@@ -2629,7 +2663,7 @@ nds32_expand_prologue (void)
Rb = gen_rtx_REG (SImode, cfun->machine->callee_saved_regs_first_regno);
Re = gen_rtx_REG (SImode, cfun->machine->callee_saved_regs_last_regno);
/* push_insn = gen_stack_push_multiple(first_regno, last_regno),
/* nds32_emit_stack_push_multiple(first_regno, last_regno),
the pattern 'stack_push_multiple' is implemented in nds32.md.
For En4 field, we have to calculate its constant value.
Refer to Andes ISA for more information. */
......@@ -2647,14 +2681,7 @@ nds32_expand_prologue (void)
if (!(REGNO (Rb) == SP_REGNUM && REGNO (Re) == SP_REGNUM && en4_const == 0))
{
/* Create multiple push instruction rtx. */
push_insn = nds32_gen_stack_push_multiple (Rb, Re, GEN_INT (en4_const));
/* Emit rtx into instructions list and receive INSN rtx form. */
push_insn = emit_insn (push_insn);
/* The insn rtx 'push_insn' will change frame layout.
We need to use RTX_FRAME_RELATED_P so that GCC is able to
generate CFI (Call Frame Information) stuff. */
RTX_FRAME_RELATED_P (push_insn) = 1;
nds32_emit_stack_push_multiple (Rb, Re, GEN_INT (en4_const));
}
/* Check frame_pointer_needed to see
......@@ -2791,7 +2818,7 @@ nds32_expand_epilogue (void)
Rb = gen_rtx_REG (SImode, cfun->machine->callee_saved_regs_first_regno);
Re = gen_rtx_REG (SImode, cfun->machine->callee_saved_regs_last_regno);
/* pop_insn = gen_stack_pop_multiple(first_regno, last_regno),
/* nds32_emit_stack_pop_multiple(first_regno, last_regno),
the pattern 'stack_pop_multiple' is implementad in nds32.md.
For En4 field, we have to calculate its constant value.
Refer to Andes ISA for more information. */
......@@ -2809,9 +2836,7 @@ nds32_expand_epilogue (void)
if (!(REGNO (Rb) == SP_REGNUM && REGNO (Re) == SP_REGNUM && en4_const == 0))
{
/* Create multiple pop instruction rtx. */
pop_insn = nds32_gen_stack_pop_multiple (Rb, Re, GEN_INT (en4_const));
/* Emit pop instruction. */
emit_insn (pop_insn);
nds32_emit_stack_pop_multiple (Rb, Re, GEN_INT (en4_const));
}
/* Generate return instruction by using
......
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