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rs6000.c (rs6000_mixed_function_arg): Update magic NULL_RTX comment. 

* config/rs6000/rs6000.c (rs6000_mixed_function_arg): Update
	magic NULL_RTX comment.
	(function_arg): Store entire fp arg to mem if any part should go
	on stack.
	(rs6000_arg_partial_bytes): Adjust for above change.

From-SVN: r112880
This commit is contained in:
Alan Modra 2006-04-12 01:26:23 +00:00 committed by Alan Modra
parent 11279bd9e4
commit 79773478a6
2 changed files with 29 additions and 24 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2006-04-12 Alan Modra <amodra@bigpond.net.au>
* config/rs6000/rs6000.c (rs6000_mixed_function_arg): Update
magic NULL_RTX comment.
(function_arg): Store entire fp arg to mem if any part should go
on stack.
(rs6000_arg_partial_bytes): Adjust for above change.
2006-04-11 Roger Sayle <roger@eyesopen.com> 2006-04-11 Roger Sayle <roger@eyesopen.com>
* dwarf2out.c (output_call_frame_info): Create debug_frame_section * dwarf2out.c (output_call_frame_info): Create debug_frame_section

45
gcc/config/rs6000/rs6000.c
View File

@ -5058,17 +5058,13 @@ rs6000_mixed_function_arg (enum machine_mode mode, tree type, int align_words)
if (align_words + n_units > GP_ARG_NUM_REG) if (align_words + n_units > GP_ARG_NUM_REG)
/* Not all of the arg fits in gprs. Say that it goes in memory too, /* Not all of the arg fits in gprs. Say that it goes in memory too,
using a magic NULL_RTX component. using a magic NULL_RTX component.
FIXME: This is not strictly correct. Only some of the arg This is not strictly correct. Only some of the arg belongs in
belongs in memory, not all of it. However, there isn't any way memory, not all of it. However, the normal scheme using
to do this currently, apart from building rtx descriptions for function_arg_partial_nregs can result in unusual subregs, eg.
the pieces of memory we want stored. Due to bugs in the generic (subreg:SI (reg:DF) 4), which are not handled well. The code to
code we can't use the normal function_arg_partial_nregs scheme store the whole arg to memory is often more efficient than code
with the PARALLEL arg description we emit here. to store pieces, and we know that space is available in the right
In any case, the code to store the whole arg to memory is often place for the whole arg. */
more efficient than code to store pieces, and we know that space
is available in the right place for the whole arg. */
/* FIXME: This should be fixed since the conversion to
TARGET_ARG_PARTIAL_BYTES. */
rvec[k++] = gen_rtx_EXPR_LIST (VOIDmode, NULL_RTX, const0_rtx); rvec[k++] = gen_rtx_EXPR_LIST (VOIDmode, NULL_RTX, const0_rtx);
i = 0; i = 0;
@ -5310,9 +5306,8 @@ function_arg (CUMULATIVE_ARGS *cum, enum machine_mode mode,
include the portion actually in registers here. */ include the portion actually in registers here. */
enum machine_mode rmode = TARGET_32BIT ? SImode : DImode; enum machine_mode rmode = TARGET_32BIT ? SImode : DImode;
rtx off; rtx off;
int i=0; int i = 0;
if (align_words + n_words > GP_ARG_NUM_REG if (align_words + n_words > GP_ARG_NUM_REG)
&& (TARGET_32BIT && TARGET_POWERPC64))
/* Not all of the arg fits in gprs. Say that it /* Not all of the arg fits in gprs. Say that it
goes in memory too, using a magic NULL_RTX goes in memory too, using a magic NULL_RTX
component. Also see comment in component. Also see comment in
@ -5391,18 +5386,20 @@ rs6000_arg_partial_bytes (CUMULATIVE_ARGS *cum, enum machine_mode mode,
align_words = rs6000_parm_start (mode, type, cum->words); align_words = rs6000_parm_start (mode, type, cum->words);
if (USE_FP_FOR_ARG_P (cum, mode, type) if (USE_FP_FOR_ARG_P (cum, mode, type))
{
/* If we are passing this arg in the fixed parameter save area /* If we are passing this arg in the fixed parameter save area
(gprs or memory) as well as fprs, then this function should (gprs or memory) as well as fprs, then this function should
return the number of bytes passed in the parameter save area return the number of partial bytes passed in the parameter
rather than bytes passed in fprs. */ save area rather than partial bytes passed in fprs. */
&& !(type if (type
&& (cum->nargs_prototype <= 0 && (cum->nargs_prototype <= 0
|| (DEFAULT_ABI == ABI_AIX || (DEFAULT_ABI == ABI_AIX
&& TARGET_XL_COMPAT && TARGET_XL_COMPAT
&& align_words >= GP_ARG_NUM_REG)))) && align_words >= GP_ARG_NUM_REG)))
{ return 0;
if (cum->fregno + ((GET_MODE_SIZE (mode) + 7) >> 3) > FP_ARG_MAX_REG + 1) else if (cum->fregno + ((GET_MODE_SIZE (mode) + 7) >> 3)
> FP_ARG_MAX_REG + 1)
ret = (FP_ARG_MAX_REG + 1 - cum->fregno) * 8; ret = (FP_ARG_MAX_REG + 1 - cum->fregno) * 8;
else if (cum->nargs_prototype >= 0) else if (cum->nargs_prototype >= 0)
return 0; return 0;