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m68k.h (EH_RETURN_DATA_REGNO): Define.

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* config/m68k/m68k.h (EH_RETURN_DATA_REGNO): Define.
	(EH_RETURN_STACKADJ_RTX): Define.
	(EH_RETURN_HANDLER_RTX): Define.
	(ASM_PREFERRED_EH_DATA_FORMAT): Define.
	* config/m68k/m68k.c (m68k_save_reg): New function.  Handle eh
	registers and don't save fixed registers.
	(m68k_output_function_prologue): Use it.
	(use_return_insn): Likewise.
	(m68k_output_function_epilogue): Likewise.

From-SVN: r59780
This commit is contained in:
Andreas Schwab 2002-12-03 19:45:30 +00:00 • committed by Andreas Schwab
parent b3eed2db61
commit 2cff4a6e82
3 changed files with 89 additions and 46 deletions
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12
gcc/ChangeLog
View file

@ -1,3 +1,15 @@
2002-12-03 Andreas Schwab <schwab@suse.de>
* config/m68k/m68k.h (EH_RETURN_DATA_REGNO): Define.
(EH_RETURN_STACKADJ_RTX): Define.
(EH_RETURN_HANDLER_RTX): Define.
(ASM_PREFERRED_EH_DATA_FORMAT): Define.
* config/m68k/m68k.c (m68k_save_reg): New function. Handle eh
registers and don't save fixed registers.
(m68k_output_function_prologue): Use it.
(use_return_insn): Likewise.
(m68k_output_function_epilogue): Likewise.
2002-12-03 Kazu Hirata <kazu@cs.umass.edu>
* config/h8300/h8300.c (single_one_operand): Fix a warning.

103
gcc/config/m68k/m68k.c
View file

@ -67,6 +67,7 @@ static void m68k_svr3_asm_out_constructor PARAMS ((rtx, int));
#endif
static void m68k_output_mi_thunk PARAMS ((FILE *, tree, HOST_WIDE_INT,
HOST_WIDE_INT, tree));
static int m68k_save_reg PARAMS ((unsigned int));
/* Alignment to use for loops and jumps */
@ -207,6 +208,34 @@ override_options ()
real_format_for_mode[XFmode - QFmode] = &ieee_extended_motorola_format;
}
/* Return 1 if we need to save REGNO. */
static int
m68k_save_reg (regno)
unsigned int regno;
{
if (flag_pic && current_function_uses_pic_offset_table
&& regno == PIC_OFFSET_TABLE_REGNUM)
return 1;
if (current_function_calls_eh_return)
{
unsigned int i;
for (i = 0; ; i++)
{
unsigned int test = EH_RETURN_DATA_REGNO (i);
if (test == INVALID_REGNUM)
break;
if (test == regno)
return 1;
}
}
return (regs_ever_live[regno]
&& !call_used_regs[regno]
&& !fixed_regs[regno]
&& !(regno == FRAME_POINTER_REGNUM && frame_pointer_needed));
}
/* This function generates the assembly code for function entry.
STREAM is a stdio stream to output the code to.
SIZE is an int: how many units of temporary storage to allocate.
@ -251,13 +280,13 @@ m68k_output_function_prologue (stream, size)
{
/* Adding negative number is faster on the 68040. */
if (fsize + 4 < 0x8000)
fprintf (stream, "\tadd.w #%d,sp\n", - (fsize + 4));
fprintf (stream, "\tadd.w $%d,sp\n", - (fsize + 4));
else
fprintf (stream, "\tadd.l #%d,sp\n", - (fsize + 4));
fprintf (stream, "\tadd.l $%d,sp\n", - (fsize + 4));
}
for (regno = 16; regno < 24; regno++)
if (regs_ever_live[regno] && ! call_used_regs[regno])
if (m68k_save_reg (regno))
mask |= 1 << (regno - 16);
if ((mask & 0xff) != 0)
@ -265,10 +294,8 @@ m68k_output_function_prologue (stream, size)
mask = 0;
for (regno = 0; regno < 16; regno++)
if (regs_ever_live[regno] && ! call_used_regs[regno])
if (m68k_save_reg (regno))
mask |= 1 << (15 - regno);
if (frame_pointer_needed)
mask &= ~ (1 << (15-FRAME_POINTER_REGNUM));
if (exact_log2 (mask) >= 0)
fprintf (stream, "\tmovel %s,-(sp)\n", reg_names[15 - exact_log2 (mask)]);
@ -441,7 +468,7 @@ m68k_output_function_prologue (stream, size)
}
#ifdef SUPPORT_SUN_FPA
for (regno = 24; regno < 56; regno++)
if (regs_ever_live[regno] && ! call_used_regs[regno])
if (m68k_save_reg (regno))
{
#ifdef MOTOROLA
asm_fprintf (stream, "\tfpmovd %s,-(%Rsp)\n",
@ -467,7 +494,7 @@ m68k_output_function_prologue (stream, size)
if (TARGET_68881)
{
for (regno = 16; regno < 24; regno++)
if (regs_ever_live[regno] && ! call_used_regs[regno])
if (m68k_save_reg (regno))
{
mask |= 1 << (regno - 16);
num_saved_regs++;
@ -500,21 +527,11 @@ m68k_output_function_prologue (stream, size)
num_saved_regs = 0;
}
for (regno = 0; regno < 16; regno++)
if (regs_ever_live[regno] && ! call_used_regs[regno])
if (m68k_save_reg (regno))
{
mask |= 1 << (15 - regno);
num_saved_regs++;
}
if (frame_pointer_needed)
{
mask &= ~ (1 << (15 - FRAME_POINTER_REGNUM));
num_saved_regs--;
}
if (flag_pic && current_function_uses_pic_offset_table)
{
mask |= 1 << (15 - PIC_OFFSET_TABLE_REGNUM);
num_saved_regs++;
}
#if NEED_PROBE
#ifdef MOTOROLA
@ -656,16 +673,10 @@ use_return_insn ()
if (!reload_completed || frame_pointer_needed || get_frame_size () != 0)
return 0;
/* Copied from output_function_epilogue (). We should probably create a
separate layout routine to perform the common work. */
for (regno = 0 ; regno < FIRST_PSEUDO_REGISTER ; regno++)
if (regs_ever_live[regno] && ! call_used_regs[regno])
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if (m68k_save_reg (regno))
return 0;
if (flag_pic && current_function_uses_pic_offset_table)
return 0;
return 1;
}
@ -693,7 +704,7 @@ m68k_output_function_epilogue (stream, size)
nregs = 0; fmask = 0; fpoffset = 0;
for (regno = 16; regno < 24; regno++)
if (regs_ever_live[regno] && ! call_used_regs[regno])
if (m68k_save_reg (regno))
{
nregs++;
fmask |= 1 << (23 - regno);
@ -701,11 +712,9 @@ m68k_output_function_epilogue (stream, size)
foffset = fpoffset + nregs * 12;
nregs = 0; mask = 0;
if (frame_pointer_needed)
regs_ever_live[FRAME_POINTER_REGNUM] = 0;
for (regno = 0; regno < 16; regno++)
if (regs_ever_live[regno] && ! call_used_regs[regno])
if (m68k_save_reg (regno))
{
nregs++;
mask |= 1 << regno;
@ -758,7 +767,7 @@ m68k_output_function_epilogue (stream, size)
if (fpoffset != 0)
for (regno = 55; regno >= 24; regno--)
if (regs_ever_live[regno] && ! call_used_regs[regno])
if (m68k_save_reg (regno))
{
if (big)
fprintf(stream, "\tfpmoved -%d(a6,a0.l), %s\n",
@ -777,11 +786,14 @@ m68k_output_function_epilogue (stream, size)
else if (fsize)
{
if (fsize + 4 < 0x8000)
fprintf (stream, "\tadd.w #%d,sp\n", fsize + 4);
fprintf (stream, "\tadd.w $%d,sp\n", fsize + 4);
else
fprintf (stream, "\tadd.l #%d,sp\n", fsize + 4);
fprintf (stream, "\tadd.l $%d,sp\n", fsize + 4);
}
if (current_function_calls_eh_return)
fprintf (stream, "\tadd.l a0,sp\n");
if (current_function_pops_args)
fprintf (stream, "\trtd $%d\n", current_function_pops_args);
else
@ -821,7 +833,7 @@ m68k_output_function_epilogue (stream, size)
nregs = 0; fmask = 0; fpoffset = 0;
#ifdef SUPPORT_SUN_FPA
for (regno = 24 ; regno < 56 ; regno++)
if (regs_ever_live[regno] && ! call_used_regs[regno])
if (m68k_save_reg (regno))
nregs++;
fpoffset = nregs * 8;
#endif
@ -829,7 +841,7 @@ m68k_output_function_epilogue (stream, size)
if (TARGET_68881)
{
for (regno = 16; regno < 24; regno++)
if (regs_ever_live[regno] && ! call_used_regs[regno])
if (m68k_save_reg (regno))
{
nregs++;
fmask |= 1 << (23 - regno);
@ -837,19 +849,12 @@ m68k_output_function_epilogue (stream, size)
}
foffset = fpoffset + nregs * 12;
nregs = 0; mask = 0;
if (frame_pointer_needed)
regs_ever_live[FRAME_POINTER_REGNUM] = 0;
for (regno = 0; regno < 16; regno++)
if (regs_ever_live[regno] && ! call_used_regs[regno])
if (m68k_save_reg (regno))
{
nregs++;
mask |= 1 << regno;
}
if (flag_pic && current_function_uses_pic_offset_table)
{
nregs++;
mask |= 1 << PIC_OFFSET_TABLE_REGNUM;
}
offset = foffset + nregs * 4;
/* FIXME : leaf_function_p below is too strong.
What we really need to know there is if there could be pending
@ -995,7 +1000,7 @@ m68k_output_function_epilogue (stream, size)
}
if (fpoffset != 0)
for (regno = 55; regno >= 24; regno--)
if (regs_ever_live[regno] && ! call_used_regs[regno])
if (m68k_save_reg (regno))
{
if (big)
{
@ -1105,6 +1110,14 @@ m68k_output_function_epilogue (stream, size)
#endif
}
}
if (current_function_calls_eh_return)
{
#ifdef MOTOROLA
asm_fprintf (stream, "\tadd.l %Ra0,%Rsp\n");
#else
asm_fprintf (stream, "\taddl %Ra0,%Rsp\n");
#endif
}
if (current_function_pops_args)
asm_fprintf (stream, "\trtd %0I%d\n", current_function_pops_args);
else

20
gcc/config/m68k/m68k.h
View file

@ -1665,6 +1665,8 @@ __transfer_from_trampoline () \
#define DATA_SECTION_ASM_OP "\t.data"
#define GLOBAL_ASM_OP "\t.globl\t"
/* Here are four prefixes that are used by asm_fprintf to
facilitate customization for alternate assembler syntaxes.
Machines with no likelihood of an alternate syntax need not
@ -1732,7 +1734,23 @@ __transfer_from_trampoline () \
/* Before the prologue, the top of the frame is at 4(%sp). */
#define INCOMING_FRAME_SP_OFFSET 4
#define GLOBAL_ASM_OP "\t.globl\t"
/* Describe how we implement __builtin_eh_return. */
#define EH_RETURN_DATA_REGNO(N) \
((N) < 2 ? (N) : INVALID_REGNUM)
#define EH_RETURN_STACKADJ_RTX gen_rtx_REG (Pmode, 8)
#define EH_RETURN_HANDLER_RTX \
gen_rtx_MEM (Pmode, \
gen_rtx_PLUS (Pmode, arg_pointer_rtx, \
plus_constant (EH_RETURN_STACKADJ_RTX, \
UNITS_PER_WORD)))
/* Select a format to encode pointers in exception handling data. CODE
is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is
true if the symbol may be affected by dynamic relocations. */
#define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \
(flag_pic \
? ((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel | DW_EH_PE_sdata4 \
: DW_EH_PE_absptr)
/* This is how to output a reference to a user-level label named NAME.
`assemble_name' uses this. */