}
\f
+/* Return TRUE if any register used in the epilogue is used. This to insure
+ any insn put into the epilogue delay slots is safe. */
+
+int
+epilogue_reg_mentioned_p (insn)
+ rtx insn;
+{
+ register char *fmt;
+ register int i;
+ register enum rtx_code code;
+ register int regno;
+
+ if (insn == (rtx)0)
+ return 0;
+
+ if (GET_CODE (insn) == LABEL_REF)
+ return 0;
+
+ code = GET_CODE (insn);
+ switch (code)
+ {
+ case REG:
+ regno = REGNO (insn);
+ if (regno == STACK_POINTER_REGNUM)
+ return 1;
+
+ if (regno == FRAME_POINTER_REGNUM && frame_pointer_needed)
+ return 1;
+
+ if (!call_used_regs[regno])
+ return 1;
+
+ if (regno != MIPS_TEMP1_REGNUM && regno != MIPS_TEMP2_REGNUM)
+ return 0;
+
+ if (!current_frame_info.initialized)
+ compute_frame_size (get_frame_size ());
+
+ return (current_frame_info.total_size >= 32768);
+
+ case SCRATCH:
+ case CC0:
+ case PC:
+ case CONST_INT:
+ case CONST_DOUBLE:
+ return 0;
+ }
+
+ fmt = GET_RTX_FORMAT (code);
+ for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
+ {
+ if (fmt[i] == 'E')
+ {
+ register int j;
+ for (j = XVECLEN (insn, i) - 1; j >= 0; j--)
+ if (epilogue_reg_mentioned_p (XVECEXP (insn, i, j)))
+ return 1;
+ }
+ else if (fmt[i] == 'e' && epilogue_reg_mentioned_p (XEXP (insn, i)))
+ return 1;
+ }
+
+ return 0;
+}
+
+\f
/* Return the bytes needed to compute the frame pointer from the current
stack pointer.
*/
-unsigned long
+long
compute_frame_size (size)
int size; /* # of var. bytes allocated */
{
int regno;
- unsigned long total_size; /* # bytes that the entire frame takes up */
- unsigned long var_size; /* # bytes that variables take up */
- unsigned long args_size; /* # bytes that outgoing arguments take up */
- unsigned long extra_size; /* # extra bytes */
- unsigned int gp_reg_rounded; /* # bytes needed to store gp after rounding */
- unsigned int gp_reg_size; /* # bytes needed to store gp regs */
- unsigned int fp_reg_size; /* # bytes needed to store fp regs */
- unsigned long mask; /* mask of saved gp registers */
- unsigned long fmask; /* mask of saved fp registers */
- int fp_inc; /* 1 or 2 depending on the size of fp regs */
- int fp_bits; /* bitmask to use for each fp register */
+ long total_size; /* # bytes that the entire frame takes up */
+ long var_size; /* # bytes that variables take up */
+ long args_size; /* # bytes that outgoing arguments take up */
+ long extra_size; /* # extra bytes */
+ long gp_reg_rounded; /* # bytes needed to store gp after rounding */
+ long gp_reg_size; /* # bytes needed to store gp regs */
+ long fp_reg_size; /* # bytes needed to store fp regs */
+ long mask; /* mask of saved gp registers */
+ long fmask; /* mask of saved fp registers */
+ int fp_inc; /* 1 or 2 depending on the size of fp regs */
+ long fp_bits; /* bitmask to use for each fp register */
gp_reg_size = 0;
fp_reg_size = 0;
if (MUST_SAVE_REGISTER (regno))
{
gp_reg_size += UNITS_PER_WORD;
- mask |= 1 << (regno - GP_REG_FIRST);
+ mask |= 1L << (regno - GP_REG_FIRST);
}
}
}
\f
-/* Save/restore registers printing out the instructions to a file. */
+/* Common code to emit the insns (or to write the instructions to a file)
+ to save/restore registers.
-void
-save_restore (file, gp_op, gp_2word_op, fp_op)
- FILE *file; /* stream to write to */
- char *gp_op; /* operation to do on gp registers */
- char *gp_2word_op; /* 2 word op to do on gp registers */
- char *fp_op; /* operation to do on fp registers */
+ Other parts of the code assume that MIPS_TEMP1_REGNUM (aka large_reg)
+ is not modified within save_restore_insns. */
+
+#define BITSET_P(value,bit) (((value) & (1L << (bit))) != 0)
+
+static void
+save_restore_insns (store_p, large_reg, large_offset, file)
+ int store_p; /* true if this is prologue */
+ rtx large_reg; /* register holding large offset constant or NULL */
+ long large_offset; /* large constant offset value */
+ FILE *file; /* file to write instructions to instead of making RTL */
{
+ long mask = current_frame_info.mask;
+ long fmask = current_frame_info.fmask;
int regno;
- unsigned long mask = current_frame_info.mask;
- unsigned long fmask = current_frame_info.fmask;
- unsigned long gp_offset;
- unsigned long fp_offset;
- unsigned long min_offset;
- char *base_reg;
+ rtx base_reg_rtx;
+ long base_offset;
+ long gp_offset;
+ long fp_offset;
+ long end_offset;
+
+ if (frame_pointer_needed && !BITSET_P (mask, FRAME_POINTER_REGNUM - GP_REG_FIRST))
+ abort ();
if (mask == 0 && fmask == 0)
return;
- base_reg = reg_names[STACK_POINTER_REGNUM];
- gp_offset = current_frame_info.gp_sp_offset;
- fp_offset = current_frame_info.fp_sp_offset;
- min_offset = (gp_offset < fp_offset && mask != 0) ? gp_offset : fp_offset;
-
- /* Deal with calling functions with a large structure. */
- if (min_offset >= 32768)
- {
- char *temp = reg_names[MIPS_TEMP2_REGNUM];
- fprintf (file, "\tli\t%s,%ld\n", temp, min_offset);
- fprintf (file, "\taddu\t%s,%s,%s\n", temp, temp, base_reg);
- base_reg = temp;
- gp_offset = min_offset - gp_offset;
- fp_offset = min_offset - fp_offset;
- }
-
/* Save registers starting from high to low. The debuggers prefer
at least the return register be stored at func+4, and also it
allows us not to need a nop in the epilog if at least one
register is reloaded in addition to return address. */
- if (mask || frame_pointer_needed)
+ /* Save GP registers if needed. */
+ if (mask)
{
- for (regno = GP_REG_LAST; regno >= GP_REG_FIRST; regno--)
- {
- if ((mask & (1L << (regno - GP_REG_FIRST))) != 0
- || (regno == FRAME_POINTER_REGNUM && frame_pointer_needed))
- {
- fprintf (file, "\t%s\t%s,%d(%s)\n",
- gp_op, reg_names[regno],
- gp_offset, base_reg);
+ /* Pick which pointer to use as a base register. For small
+ frames, just use the stack pointer. Otherwise, use a
+ temporary register. Save 2 cycles if the save area is near
+ the end of a large frame, by reusing the constant created in
+ the prologue/epilogue to adjust the stack frame. */
- gp_offset -= UNITS_PER_WORD;
- }
+ gp_offset = current_frame_info.gp_sp_offset;
+ end_offset = gp_offset - (current_frame_info.gp_reg_size - UNITS_PER_WORD);
+
+ if (gp_offset < 0 || end_offset < 0)
+ fatal ("gp_offset (%ld) or end_offset (%ld) is less than zero.",
+ gp_offset, end_offset);
+
+ else if (gp_offset < 32768)
+ {
+ base_reg_rtx = stack_pointer_rtx;
+ base_offset = 0;
}
- }
- if (fmask)
- {
- int fp_inc = (TARGET_FLOAT64) ? 1 : 2;
+ else if (large_reg != (rtx)0
+ && (((unsigned long)(large_offset - gp_offset)) < 32768)
+ && (((unsigned long)(large_offset - end_offset)) < 32768))
+ {
+ base_reg_rtx = gen_rtx (REG, Pmode, MIPS_TEMP2_REGNUM);
+ base_offset = large_offset;
+ if (file == (FILE *)0)
+ emit_insn (gen_addsi3 (base_reg_rtx, large_reg, stack_pointer_rtx));
+ else
+ fprintf (file, "\taddu\t%s,%s,%s\n",
+ reg_names[MIPS_TEMP2_REGNUM],
+ reg_names[REGNO (large_reg)],
+ reg_names[STACK_POINTER_REGNUM]);
+ }
- for (regno = FP_REG_LAST-1; regno >= FP_REG_FIRST; regno -= fp_inc)
+ else
{
- if ((fmask & (1L << (regno - FP_REG_FIRST))) != 0)
+ base_reg_rtx = gen_rtx (REG, Pmode, MIPS_TEMP2_REGNUM);
+ base_offset = gp_offset;
+ if (file == (FILE *)0)
{
- fprintf (file, "\t%s\t%s,%d(%s)\n",
- fp_op, reg_names[regno], fp_offset, base_reg);
-
- fp_offset -= 2*UNITS_PER_WORD;
+ emit_move_insn (base_reg_rtx, GEN_INT (gp_offset));
+ emit_insn (gen_addsi3 (base_reg_rtx, base_reg_rtx, stack_pointer_rtx));
}
+ else
+ fprintf (file, "\tli\t%s,0x%.08lx\t# %ld\n\taddu\t%s,%s,%s\n",
+ reg_names[MIPS_TEMP2_REGNUM],
+ (long)base_offset,
+ (long)base_offset,
+ reg_names[MIPS_TEMP2_REGNUM],
+ reg_names[MIPS_TEMP2_REGNUM],
+ reg_names[STACK_POINTER_REGNUM]);
}
- }
-}
-
-\f
-/* Common code to emit the insns to save/restore registers. */
-
-static void
-save_restore_insns (store_p)
- int store_p; /* true if this is prologue */
-{
- int regno;
- rtx base_reg_rtx = stack_pointer_rtx;
- unsigned long mask = current_frame_info.mask;
- unsigned long fmask = current_frame_info.fmask;
- unsigned long gp_offset;
- unsigned long fp_offset;
- unsigned long min_offset;
-
- if (mask == 0 && fmask == 0)
- return;
-
- gp_offset = current_frame_info.gp_sp_offset;
- fp_offset = current_frame_info.fp_sp_offset;
- min_offset = (gp_offset < fp_offset && mask != 0) ? gp_offset : fp_offset;
-
- /* Deal with calling functions with a large structure. */
- if (min_offset >= 32768)
- {
- base_reg_rtx = gen_rtx (REG, Pmode, MIPS_TEMP2_REGNUM);
- emit_move_insn (base_reg_rtx, GEN_INT (min_offset));
- emit_insn (gen_addsi3 (base_reg_rtx, base_reg_rtx, stack_pointer_rtx));
- gp_offset = min_offset - gp_offset;
- fp_offset = min_offset - fp_offset;
- }
- /* Save registers starting from high to low. The debuggers prefer
- at least the return register be stored at func+4, and also it
- allows us not to need a nop in the epilog if at least one
- register is reloaded in addition to return address. */
-
- if (mask || frame_pointer_needed)
- {
for (regno = GP_REG_LAST; regno >= GP_REG_FIRST; regno--)
{
- if ((mask & (1L << (regno - GP_REG_FIRST))) != 0
- || (regno == FRAME_POINTER_REGNUM && frame_pointer_needed))
+ if (BITSET_P (mask, regno - GP_REG_FIRST))
{
- rtx reg_rtx = gen_rtx (REG, Pmode, regno);
- rtx mem_rtx = gen_rtx (MEM, Pmode,
- gen_rtx (PLUS, Pmode, base_reg_rtx,
- GEN_INT (gp_offset)));
+ if (file == (FILE *)0)
+ {
+ rtx reg_rtx = gen_rtx (REG, Pmode, regno);
+ rtx mem_rtx = gen_rtx (MEM, Pmode,
+ gen_rtx (PLUS, Pmode, base_reg_rtx,
+ GEN_INT (gp_offset - base_offset)));
- if (store_p)
- emit_move_insn (mem_rtx, reg_rtx);
+ if (store_p)
+ emit_move_insn (mem_rtx, reg_rtx);
+ else
+ emit_move_insn (reg_rtx, mem_rtx);
+ }
else
- emit_move_insn (reg_rtx, mem_rtx);
+ fprintf (file, "\t%s\t%s,%ld(%s)\n",
+ (store_p) ? "sw" : "lw",
+ reg_names[regno],
+ gp_offset - base_offset,
+ reg_names[REGNO(base_reg_rtx)]);
gp_offset -= UNITS_PER_WORD;
}
}
}
+ else
+ {
+ base_reg_rtx = (rtx)0; /* Make sure these are initialzed */
+ base_offset = 0;
+ }
+ /* Save floating point registers if needed. */
if (fmask)
{
int fp_inc = (TARGET_FLOAT64) ? 1 : 2;
+ /* Pick which pointer to use as a base register. */
+ fp_offset = current_frame_info.fp_sp_offset;
+ end_offset = fp_offset - (current_frame_info.fp_reg_size - UNITS_PER_WORD);
+
+ if (fp_offset < 0 || end_offset < 0)
+ fatal ("fp_offset (%ld) or end_offset (%ld) is less than zero.",
+ fp_offset, end_offset);
+
+ else if (fp_offset < 32768)
+ {
+ base_reg_rtx = stack_pointer_rtx;
+ base_offset = 0;
+ }
+
+ else if (base_reg_rtx != (rtx)0
+ && (((unsigned long)(base_offset - fp_offset)) < 32768)
+ && (((unsigned long)(base_offset - end_offset)) < 32768))
+ {
+ ; /* already set up for gp registers above */
+ }
+
+ else if (large_reg != (rtx)0
+ && (((unsigned long)(large_offset - fp_offset)) < 32768)
+ && (((unsigned long)(large_offset - end_offset)) < 32768))
+ {
+ base_reg_rtx = gen_rtx (REG, Pmode, MIPS_TEMP2_REGNUM);
+ base_offset = large_offset;
+ if (file == (FILE *)0)
+ emit_insn (gen_addsi3 (base_reg_rtx, large_reg, stack_pointer_rtx));
+ else
+ fprintf (file, "\taddu\t%s,%s,%s\n",
+ reg_names[MIPS_TEMP2_REGNUM],
+ reg_names[REGNO (large_reg)],
+ reg_names[STACK_POINTER_REGNUM]);
+ }
+
+ else
+ {
+ base_reg_rtx = gen_rtx (REG, Pmode, MIPS_TEMP2_REGNUM);
+ base_offset = fp_offset;
+ if (file == (FILE *)0)
+ {
+ emit_move_insn (base_reg_rtx, GEN_INT (fp_offset));
+ emit_insn (gen_addsi3 (base_reg_rtx, base_reg_rtx, stack_pointer_rtx));
+ }
+ else
+ fprintf (file, "\tli\t%s,0x%.08lx\t# %ld\n\taddu\t%s,%s,%s\n",
+ reg_names[MIPS_TEMP2_REGNUM],
+ (long)base_offset,
+ (long)base_offset,
+ reg_names[MIPS_TEMP2_REGNUM],
+ reg_names[MIPS_TEMP2_REGNUM],
+ reg_names[STACK_POINTER_REGNUM]);
+ }
+
for (regno = FP_REG_LAST-1; regno >= FP_REG_FIRST; regno -= fp_inc)
{
- if ((fmask & (1L << (regno - FP_REG_FIRST))) != 0)
+ if (BITSET_P (fmask, regno - FP_REG_FIRST))
{
- rtx reg_rtx = gen_rtx (REG, DFmode, regno);
- rtx mem_rtx = gen_rtx (MEM, DFmode,
- gen_rtx (PLUS, Pmode, base_reg_rtx,
- GEN_INT (fp_offset)));
+ if (file == (FILE *)0)
+ {
+ rtx reg_rtx = gen_rtx (REG, DFmode, regno);
+ rtx mem_rtx = gen_rtx (MEM, DFmode,
+ gen_rtx (PLUS, Pmode, base_reg_rtx,
+ GEN_INT (fp_offset - base_offset)));
- if (store_p)
- emit_move_insn (mem_rtx, reg_rtx);
+ if (store_p)
+ emit_move_insn (mem_rtx, reg_rtx);
+ else
+ emit_move_insn (reg_rtx, mem_rtx);
+ }
else
- emit_move_insn (reg_rtx, mem_rtx);
+ fprintf (file, "\t%s\t%s,%ld(%s)\n",
+ (store_p) ? "s.d" : "l.d",
+ reg_names[regno],
+ fp_offset - base_offset,
+ reg_names[REGNO(base_reg_rtx)]);
+
fp_offset -= 2*UNITS_PER_WORD;
}
FILE *file;
int size;
{
- int tsize = current_frame_info.total_size;
+ long tsize = current_frame_info.total_size;
ASM_OUTPUT_SOURCE_FILENAME (file, DECL_SOURCE_FILE (current_function_decl));
fputs ("\t.ent\t", file);
assemble_name (file, current_function_name);
fputs ("\n", file);
+
assemble_name (file, current_function_name);
fputs (":\n", file);
mips_expand_prologue ()
{
int regno;
- int tsize;
+ long tsize;
tree fndecl = current_function_decl; /* current... is tooo long */
tree fntype = TREE_TYPE (fndecl);
tree fnargs = (TREE_CODE (fntype) != METHOD_TYPE)
: 0;
tree next_arg;
tree cur_arg;
+ rtx tmp_rtx = (rtx)0;
char *arg_name = (char *)0;
CUMULATIVE_ARGS args_so_far;
if (tsize > 32767)
{
- rtx tmp_rtx = gen_rtx (REG, SImode, MIPS_TEMP1_REGNUM);
+ tmp_rtx = gen_rtx (REG, SImode, MIPS_TEMP1_REGNUM);
emit_move_insn (tmp_rtx, tsize_rtx);
tsize_rtx = tmp_rtx;
}
emit_insn (gen_subsi3 (stack_pointer_rtx, stack_pointer_rtx, tsize_rtx));
- save_restore_insns (TRUE);
+ save_restore_insns (TRUE, tmp_rtx, tsize, (FILE *)0);
if (frame_pointer_needed)
emit_insn (gen_movsi (frame_pointer_rtx, stack_pointer_rtx));
FILE *file;
int size;
{
- int tsize;
+ long tsize;
char *sp_str = reg_names[STACK_POINTER_REGNUM];
char *t1_str = reg_names[MIPS_TEMP1_REGNUM];
rtx epilogue_delay = current_function_epilogue_delay_list;
int noepilogue = FALSE;
int load_nop = FALSE;
int load_only_r31;
+ rtx tmp_rtx = (rtx)0;
+ rtx restore_rtx;
+ int i;
/* The epilogue does not depend on any registers, but the stack
registers, so we assume that if we have 1 pending nop, it can be
fprintf (file, "\t.set\tnoreorder\n");
if (tsize > 32767)
- fprintf (file, "\tli\t%s,%d\n", t1_str, tsize);
+ {
+ fprintf (file, "\tli\t%s,0x%.08lx\t# %ld\n", t1_str, (long)tsize, (long)tsize);
+ tmp_rtx = gen_rtx (REG, Pmode, MIPS_TEMP1_REGNUM);
+ }
if (frame_pointer_needed)
fprintf (file, "\tmove\t%s,%s\t\t\t# sp not trusted here\n",
sp_str, reg_names[FRAME_POINTER_REGNUM]);
- save_restore (file, "lw", "ld", "l.d");
+ save_restore_insns (FALSE, tmp_rtx, tsize, file);
load_only_r31 = (current_frame_info.mask == (1 << 31)
&& current_frame_info.fmask == 0);
void
mips_expand_epilogue ()
{
- int tsize = current_frame_info.total_size;
+ long tsize = current_frame_info.total_size;
rtx tsize_rtx = GEN_INT (tsize);
+ rtx tmp_rtx = (rtx)0;
if (tsize > 32767)
{
- rtx tmp_rtx = gen_rtx (REG, SImode, MIPS_TEMP1_REGNUM);
+ tmp_rtx = gen_rtx (REG, SImode, MIPS_TEMP1_REGNUM);
emit_move_insn (tmp_rtx, tsize_rtx);
tsize_rtx = tmp_rtx;
}
if (frame_pointer_needed)
emit_insn (gen_movsi (stack_pointer_rtx, frame_pointer_rtx));
- save_restore_insns (FALSE);
+ save_restore_insns (FALSE, tmp_rtx, tsize, (FILE *)0);
emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx, tsize_rtx));
}