Hi!
The following patch enables _BitInt support on x86-64, the only
target which has _BitInt specified in psABI.
2023-08-09 Jakub Jelinek <ja...@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.
--- gcc/config/i386/i386.cc.jj 2023-08-08 15:55:05.627176766 +0200
+++ gcc/config/i386/i386.cc 2023-08-08 16:12:02.308940091 +0200
@@ -2121,7 +2121,8 @@ classify_argument (machine_mode mode, co
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, co
}
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 ();
}
@@ -24842,6 +24851,26 @@ ix86_get_excess_precision (enum excess_p
return FLT_EVAL_METHOD_UNPREDICTABLE;
}
+/* Return true if _BitInt(N) is supported and fill details about it 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.
@@ -25446,6 +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
Jakub
