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(i960_function_prologue): When profiling, don't use those registers clobbered around an mcount call.

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(i960_function_prologue): When profiling, don't use those
registers clobbered around an mcount call.
(output_function_profiler): New function.

From-SVN: r3916
This commit is contained in:
Jim Wilson 1993-03-29 14:32:08 -08:00
parent 77545d45a3
commit 7a24dbcfa9
1 changed files with 89 additions and 0 deletions
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89
gcc/config/i960/i960.c
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@ -999,6 +999,18 @@ i960_function_prologue (file, size)
epilogue_string[0] = '\0';
if (profile_flag || profile_block_flag)
{
/* When profiling, we may use registers 20 to 27 to save arguments, so
they can't be used here for saving globals. J is the number of
argument registers the mcount call will save. */
for (j = 7; j >= 0 && ! regs_ever_live[j]; j--)
;
for (i = 20; i <= j + 20; i++)
regs[i] = -1;
}
/* First look for local registers to save globals in. */
for (i = 0; i < 16; i++)
{
@ -1134,6 +1146,83 @@ i960_function_prologue (file, size)
fprintf (file, "\t#End Prologue#\n");
}
/* Output code for the function profiler. */
void
output_function_profiler (file, labelno)
FILE *file;
int labelno;
{
/* The last used parameter register. */
int last_parm_reg;
int i, j, increment;
/* Figure out the last used parameter register. The proper thing to do
is to walk incoming args of the function. A function might have live
parameter registers even if it has no incoming args. Note that we
don't have to save parameter registers g8 to g11 because they are
call preserved. */
/* See also output_function_prologue, which tries to use local registers
for preserved call-saved global registers. */
for (last_parm_reg = 7;
last_parm_reg >= 0 && ! regs_ever_live[last_parm_reg];
last_parm_reg--)
;
/* Save parameter registers in regs r4 (20) to r11 (27). */
for (i = 0, j = 4; i <= last_parm_reg; i += increment, j += increment)
{
if (i % 4 == 0 && (last_parm_reg - i) >= 3)
increment = 4;
else if (i % 4 == 0 && (last_parm_reg - i) >= 2)
increment = 3;
else if (i % 2 == 0 && (last_parm_reg - i) >= 1)
increment = 2;
else
increment = 1;
fprintf (file, "\tmov%s g%d,r%d\n",
(increment == 4 ? "q" : increment == 3 ? "t"
: increment == 2 ? "l": ""), i, j);
}
/* If this function uses the arg pointer, then save it in r3 and then
set it to zero. */
if (current_function_args_size != 0)
fprintf (file, "\tmov g14,r3\n\tmov 0,g14");
/* Load location address into g0 and call mcount. */
fprintf (file, "\tlda\tLP%d,g0\n\tcallx\tmcount\n", labelno);
/* If this function uses the arg pointer, restore it. */
if (current_function_args_size != 0)
fprintf (file, "\tmov r3,g14");
/* Restore parameter registers. */
for (i = 0, j = 4; i <= last_parm_reg; i += increment, j += increment)
{
if (i % 4 == 0 && (last_parm_reg - i) >= 3)
increment = 4;
else if (i % 4 == 0 && (last_parm_reg - i) >= 2)
increment = 3;
else if (i % 2 == 0 && (last_parm_reg - i) >= 1)
increment = 2;
else
increment = 1;
fprintf (file, "\tmov%s r%d,g%d\n",
(increment == 4 ? "q" : increment == 3 ? "t"
: increment == 2 ? "l": ""), j, i);
}
}
/* Output code for the function epilogue. */
void