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expr.c (emit_single_push_insn): If padding is needed downward...

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* expr.c (emit_single_push_insn): If padding is needed
	downward, adjust the stack pointer first, and then store the
	data into the stack location using an offset.

From-SVN: r68670
This commit is contained in:
Kazu Hirata 2003-06-29 13:40:24 +00:00 committed by Kazu Hirata
parent 159b3be1f3
commit 329d586fe5
2 changed files with 42 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2003-06-29 Kazu Hirata <kazu@cs.umass.edu>
* expr.c (emit_single_push_insn): If padding is needed
downward, adjust the stack pointer first, and then store the
data into the stack location using an offset.
2003-06-29 Andreas Jaeger <aj@suse.de>
* collect2.h: Convert prototypes to ISO C90.

36
gcc/expr.c
View File

@ -3802,12 +3802,48 @@ emit_single_push_insn (mode, x, type)
}
if (GET_MODE_SIZE (mode) == rounded_size)
dest_addr = gen_rtx_fmt_e (STACK_PUSH_CODE, Pmode, stack_pointer_rtx);
/* If we are to pad downward, adjust the stack pointer first and
then store X into the stack location using an offset. This is
because emit_move_insn does not know how to pad; it does not have
access to type. */
else if (FUNCTION_ARG_PADDING (mode, type) == downward)
{
unsigned padding_size = rounded_size - GET_MODE_SIZE (mode);
HOST_WIDE_INT offset;
emit_move_insn (stack_pointer_rtx,
expand_binop (Pmode,
#ifdef STACK_GROWS_DOWNWARD
sub_optab,
#else
add_optab,
#endif
stack_pointer_rtx,
GEN_INT (rounded_size),
NULL_RTX, 0, OPTAB_LIB_WIDEN));
offset = (HOST_WIDE_INT) padding_size;
#ifdef STACK_GROWS_DOWNWARD
if (STACK_PUSH_CODE == POST_DEC)
/* We have already decremented the stack pointer, so get the
previous value. */
offset += (HOST_WIDE_INT) rounded_size;
#else
if (STACK_PUSH_CODE == POST_INC)
/* We have already incremented the stack pointer, so get the
previous value. */
offset -= (HOST_WIDE_INT) rounded_size;
#endif
dest_addr = gen_rtx_PLUS (Pmode, stack_pointer_rtx, GEN_INT (offset));
}
else
{
#ifdef STACK_GROWS_DOWNWARD
/* ??? This seems wrong if STACK_PUSH_CODE == POST_DEC. */
dest_addr = gen_rtx_PLUS (Pmode, stack_pointer_rtx,
GEN_INT (-(HOST_WIDE_INT) rounded_size));
#else
/* ??? This seems wrong if STACK_PUSH_CODE == POST_INC. */
dest_addr = gen_rtx_PLUS (Pmode, stack_pointer_rtx,
GEN_INT (rounded_size));
#endif