Add `intrinsics.constant_(floor|truncate|ceil|round)`

1 files changed, 36 insertions, 0 deletions

diff --git a/src/check_builtin.cpp b/src/check_builtin.cpp
index 2ff3136ff..85a3f4515 100644
--- a/src/check_builtin.cpp
+++ b/src/check_builtin.cpp
@@ -4768,6 +4768,42 @@ gb_internal bool check_builtin_procedure(CheckerContext *c, Operand *operand, As
 		break;
 	}
 
+	case BuiltinProc_constant_floor:
+	case BuiltinProc_constant_truncate:
+	case BuiltinProc_constant_ceil:
+	case BuiltinProc_constant_round:
+	{
+		Operand o = {};
+		check_expr(c, &o, ce->args[0]);
+
+		if (!is_type_integer_or_float(o.type) && (o.mode != Addressing_Constant)) {
+			error(ce->args[0], "Expected a constant number for '%.*s'", LIT(builtin_name));
+			return false;
+		}
+		operand->mode = Addressing_Constant;
+		operand->type = o.type;
+
+		ExactValue value = o.value;
+		if (value.kind == ExactValue_Integer) {
+			// do nothing
+		} else if (value.kind == ExactValue_Float) {
+			f64 f = value.value_float;
+			switch (id) {
+			case BuiltinProc_constant_floor:    f = floor(f); break;
+			case BuiltinProc_constant_truncate: f = trunc(f); break;
+			case BuiltinProc_constant_ceil:     f = ceil(f);  break;
+			case BuiltinProc_constant_round:    f = round(f); break;
+			default:
+				GB_PANIC("Unhandled built-in: %.*s", LIT(builtin_name));
+				break;
+			}
+			value = exact_value_float(f);
+		}
+
+		operand->value = value;
+		break;
+	}
+
 	case BuiltinProc_soa_struct: {
 		Operand x = {};
 		Operand y = {};