From 36945079f8131973abb9e59bf642ab13c1c602be Mon Sep 17 00:00:00 2001
From: gingerBill <bill@gingerbill.org>
Date: Mon, 5 May 2025 11:41:54 +0100
Subject: Add `intrinsics.simd_indices`

---
 src/check_builtin.cpp | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'src/check_builtin.cpp')

diff --git a/src/check_builtin.cpp b/src/check_builtin.cpp
index f66a8605c..9d07de2b6 100644
--- a/src/check_builtin.cpp
+++ b/src/check_builtin.cpp
@@ -760,6 +760,36 @@ gb_internal bool check_builtin_simd_operation(CheckerContext *c, Operand *operan
 			return true;
 		}
 
+	case BuiltinProc_simd_indices:
+		{
+			Operand x = {};
+			check_expr_or_type(c, &x, ce->args[0], nullptr);
+			if (x.mode == Addressing_Invalid) return false;
+			if (x.mode != Addressing_Type) {
+				gbString s = expr_to_string(x.expr);
+				error(x.expr, "'%.*s' expected a simd vector type, got '%s'", LIT(builtin_name), s);
+				gb_string_free(s);
+				return false;
+			}
+			if (!is_type_simd_vector(x.type)) {
+				gbString s = type_to_string(x.type);
+				error(x.expr, "'%.*s' expected a simd vector type, got '%s'", LIT(builtin_name), s);
+				gb_string_free(s);
+				return false;
+			}
+
+			Type *elem = base_array_type(x.type);
+			if (!is_type_numeric(elem)) {
+				gbString s = type_to_string(x.type);
+				error(x.expr, "'%.*s' expected a simd vector type with a numeric element type, got '%s'", LIT(builtin_name), s);
+				gb_string_free(s);
+			}
+
+			operand->mode = Addressing_Value;
+			operand->type = x.type;
+			return true;
+		}
+
 	case BuiltinProc_simd_extract:
 		{
 			Operand x = {};
@@ -2059,6 +2089,7 @@ gb_internal bool check_builtin_procedure(CheckerContext *c, Operand *operand, As
 	case BuiltinProc_atomic_type_is_lock_free:
 	case BuiltinProc_has_target_feature:
 	case BuiltinProc_procedure_of:
+	case BuiltinProc_simd_indices:
 		// NOTE(bill): The first arg may be a Type, this will be checked case by case
 		break;
 
-- 
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