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i386: Enable _BitInt on x86-64 [PR102989]

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The following patch enables _BitInt support on x86-64, the only
target which has _BitInt specified in psABI.

2023-09-06  Jakub Jelinek  <jakub@redhat.com>

	PR c/102989
	* config/i386/i386.cc (classify_argument): Handle BITINT_TYPE.
	(ix86_bitint_type_info): New function.
	(TARGET_C_BITINT_TYPE_INFO): Redefine.
This commit is contained in:
Jakub Jelinek 2023-09-06 17:29:17 +02:00
parent a9d6c7fbeb
commit b38deff612
1 changed files with 31 additions and 1 deletions
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32
gcc/config/i386/i386.cc
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@ -2121,7 +2121,8 @@ classify_argument (machine_mode mode, const_tree type,
return 0;
}
if (type && AGGREGATE_TYPE_P (type))
if (type && (AGGREGATE_TYPE_P (type)
|| (TREE_CODE (type) == BITINT_TYPE && words > 1)))
{
int i;
tree field;
@ -2270,6 +2271,14 @@ classify_argument (machine_mode mode, const_tree type,
}
break;
case BITINT_TYPE:
/* _BitInt(N) for N > 64 is passed as structure containing
(N + 63) / 64 64-bit elements. */
if (words > 2)
return 0;
classes[0] = classes[1] = X86_64_INTEGER_CLASS;
return 2;
default:
gcc_unreachable ();
}
@ -24843,6 +24852,25 @@ ix86_get_excess_precision (enum excess_precision_type type)
return FLT_EVAL_METHOD_UNPREDICTABLE;
}
/* Return true if _BitInt(N) is supported and fill its details into *INFO. */
bool
ix86_bitint_type_info (int n, struct bitint_info *info)
{
if (!TARGET_64BIT)
return false;
if (n <= 8)
info->limb_mode = QImode;
else if (n <= 16)
info->limb_mode = HImode;
else if (n <= 32)
info->limb_mode = SImode;
else
info->limb_mode = DImode;
info->big_endian = false;
info->extended = false;
return true;
}
/* Implement PUSH_ROUNDING. On 386, we have pushw instruction that
decrements by exactly 2 no matter what the position was, there is no pushb.
@ -25447,6 +25475,8 @@ ix86_run_selftests (void)
#undef TARGET_C_EXCESS_PRECISION
#define TARGET_C_EXCESS_PRECISION ix86_get_excess_precision
#undef TARGET_C_BITINT_TYPE_INFO
#define TARGET_C_BITINT_TYPE_INFO ix86_bitint_type_info
#undef TARGET_PROMOTE_PROTOTYPES
#define TARGET_PROMOTE_PROTOTYPES hook_bool_const_tree_true
#undef TARGET_PUSH_ARGUMENT