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rs6000.c (rs6000_arg_partial_bytes): Simplify logic by making use of the fact that for vector / floating point...

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2013-11-14  Ulrich Weigand  <Ulrich.Weigand@de.ibm.com>

	* config/rs6000/rs6000.c (rs6000_arg_partial_bytes): Simplify logic
	by making use of the fact that for vector / floating point arguments
	passed both in VRs/FPRs and in the fixed parameter area, the partial
	bytes mechanism is in fact not used.

From-SVN: r204807
This commit is contained in:
Ulrich Weigand 2013-11-14 18:40:12 +00:00 • committed by Ulrich Weigand
parent 98eefff6bc
commit 140f2c812c
2 changed files with 31 additions and 11 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2013-11-14 Ulrich Weigand <Ulrich.Weigand@de.ibm.com>
* config/rs6000/rs6000.c (rs6000_arg_partial_bytes): Simplify logic
by making use of the fact that for vector / floating point arguments
passed both in VRs/FPRs and in the fixed parameter area, the partial
bytes mechanism is in fact not used.
2013-11-14 Ulrich Weigand <Ulrich.Weigand@de.ibm.com>
* config/rs6000/rs6000.c (rs6000_psave_function_arg): New function.

35
gcc/config/rs6000/rs6000.c
View file

@ -9840,15 +9840,25 @@ rs6000_arg_partial_bytes (cumulative_args_t cum_v, enum machine_mode mode,
tree type, bool named)
{
CUMULATIVE_ARGS *cum = get_cumulative_args (cum_v);
bool passed_in_gprs = true;
int ret = 0;
int align_words;
if (DEFAULT_ABI == ABI_V4)
return 0;
if (USE_ALTIVEC_FOR_ARG_P (cum, mode, named)
&& cum->nargs_prototype >= 0)
return 0;
if (USE_ALTIVEC_FOR_ARG_P (cum, mode, named))
{
/* If we are passing this arg in the fixed parameter save area
(gprs or memory) as well as VRs, we do not use the partial
bytes mechanism; instead, rs6000_function_arg will return a
PARALLEL including a memory element as necessary. */
if (TARGET_64BIT && ! cum->prototype)
return 0;
/* Otherwise, we pass in VRs only. No partial copy possible. */
passed_in_gprs = false;
}
/* In this complicated case we just disable the partial_nregs code. */
if (TARGET_MACHO && rs6000_darwin64_struct_check_p (mode, type))
@ -9858,24 +9868,27 @@ rs6000_arg_partial_bytes (cumulative_args_t cum_v, enum machine_mode mode,
if (USE_FP_FOR_ARG_P (cum, mode))
{
unsigned long n_fpreg = (GET_MODE_SIZE (mode) + 7) >> 3;
/* If we are passing this arg in the fixed parameter save area
(gprs or memory) as well as fprs, then this function should
return the number of partial bytes passed in the parameter
save area rather than partial bytes passed in fprs. */
(gprs or memory) as well as FPRs, we do not use the partial
bytes mechanism; instead, rs6000_function_arg will return a
PARALLEL including a memory element as necessary. */
if (type
&& (cum->nargs_prototype <= 0
|| (DEFAULT_ABI == ABI_AIX
&& TARGET_XL_COMPAT
&& align_words >= GP_ARG_NUM_REG)))
return 0;
else if (cum->fregno + ((GET_MODE_SIZE (mode) + 7) >> 3)
> FP_ARG_MAX_REG + 1)
/* Otherwise, we pass in FPRs only. Check for partial copies. */
passed_in_gprs = false;
if (cum->fregno + n_fpreg > FP_ARG_MAX_REG + 1)
ret = (FP_ARG_MAX_REG + 1 - cum->fregno) * 8;
else if (cum->nargs_prototype >= 0)
return 0;
}
if (align_words < GP_ARG_NUM_REG
if (passed_in_gprs
&& align_words < GP_ARG_NUM_REG
&& GP_ARG_NUM_REG < align_words + rs6000_arg_size (mode, type))
ret = (GP_ARG_NUM_REG - align_words) * (TARGET_32BIT ? 4 : 8);