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dwarf2out.c (stack_adjust_offset): New function.

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2000-09-01  Andrew Haley  <aph@redhat.com>

        * dwarf2out.c (stack_adjust_offset): New function.
        (dwarf2out_stack_adjust): Break out stack adjust logic into
        new stack_adjust_offset function.  Look inside parallels and
        sequences for stack adjustments.

From-SVN: r36098
This commit is contained in:
Andrew Haley 2000-09-01 13:34:26 +00:00 committed by Andrew Haley
parent f75157d263
commit 1ba5ae8f08
2 changed files with 64 additions and 33 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2000-09-01 Andrew Haley <aph@redhat.com>
* dwarf2out.c (stack_adjust_offset): New function.
(dwarf2out_stack_adjust): Break out stack adjust logic into
new stack_adjust_offset function. Look inside parallels and
sequences for stack adjustments.
2000-08-31 Jeff Law <law@cygnus.com>
* arm.md: Use no_new_pseudos to determine when it is safe

90
gcc/dwarf2out.c
View File

@ -1093,6 +1093,49 @@ initial_return_save (rtl)
reg_save (NULL, DWARF_FRAME_RETURN_COLUMN, reg, offset - cfa.offset);
}
/* Given a SET, calculate the amount of stack adjustment it
contains. */
static long stack_adjust_offset (pattern)
rtx pattern;
{
rtx src = SET_SRC (pattern);
rtx dest = SET_DEST (pattern);
long offset = 0;
enum rtx_code code;
if (dest == stack_pointer_rtx)
{
/* (set (reg sp) (plus (reg sp) (const_int))) */
code = GET_CODE (src);
if (! (code == PLUS || code == MINUS)
|| XEXP (src, 0) != stack_pointer_rtx
|| GET_CODE (XEXP (src, 1)) != CONST_INT)
return 0;
offset = INTVAL (XEXP (src, 1));
}
else if (GET_CODE (dest) == MEM)
{
/* (set (mem (pre_dec (reg sp))) (foo)) */
src = XEXP (dest, 0);
code = GET_CODE (src);
if (! (code == PRE_DEC || code == PRE_INC)
|| XEXP (src, 0) != stack_pointer_rtx)
return 0;
offset = GET_MODE_SIZE (GET_MODE (dest));
}
else
return 0;
if (code == PLUS || code == PRE_INC)
offset = -offset;
return offset;
}
/* Check INSN to see if it looks like a push or a stack adjustment, and
make a note of it if it does. EH uses this information to find out how
much extra space it needs to pop off the stack. */
@ -1138,45 +1181,26 @@ dwarf2out_stack_adjust (insn)
}
else if (GET_CODE (PATTERN (insn)) == SET)
{
rtx src, dest;
enum rtx_code code;
offset = stack_adjust_offset (PATTERN (insn));
}
else if (GET_CODE (PATTERN (insn)) == PARALLEL
|| GET_CODE (PATTERN (insn)) == SEQUENCE)
{
/* There may be stack adjustments inside compound insns. Search
for them. */
int j;
insn = PATTERN (insn);
src = SET_SRC (insn);
dest = SET_DEST (insn);
if (dest == stack_pointer_rtx)
offset = 0;
for (j = XVECLEN (PATTERN (insn), 0) - 1; j >= 0; j--)
{
/* (set (reg sp) (plus (reg sp) (const_int))) */
code = GET_CODE (src);
if (! (code == PLUS || code == MINUS)
|| XEXP (src, 0) != stack_pointer_rtx
|| GET_CODE (XEXP (src, 1)) != CONST_INT)
return;
offset = INTVAL (XEXP (src, 1));
rtx pattern = XVECEXP (PATTERN (insn), 0, j);
if (GET_CODE (pattern) == SET)
offset += stack_adjust_offset (pattern);
}
else if (GET_CODE (dest) == MEM)
{
/* (set (mem (pre_dec (reg sp))) (foo)) */
src = XEXP (dest, 0);
code = GET_CODE (src);
if (! (code == PRE_DEC || code == PRE_INC)
|| XEXP (src, 0) != stack_pointer_rtx)
return;
offset = GET_MODE_SIZE (GET_MODE (dest));
}
else
return;
if (code == PLUS || code == PRE_INC)
offset = -offset;
}
else
return;
if (offset == 0)
return;