From 99520d82fd26316fc795ae524cc0dfa3477fdac8 Mon Sep 17 00:00:00 2001
From: gingerBill <gingerBill@users.noreply.github.com>
Date: Thu, 30 Oct 2025 08:52:21 +0000
Subject: [PATCH] Add `intrinsics.constant_(floor|truncate|ceil|round)`

---
 base/intrinsics/intrinsics.odin |  5 +++++
 src/check_builtin.cpp           | 36 +++++++++++++++++++++++++++++++++
 src/checker_builtin_procs.hpp   | 11 +++++++++-
 src/types.cpp                   |  9 +++++++++
 4 files changed, 60 insertions(+), 1 deletion(-)

diff --git a/base/intrinsics/intrinsics.odin b/base/intrinsics/intrinsics.odin
index 952f927bd..0274eb731 100644
--- a/base/intrinsics/intrinsics.odin
+++ b/base/intrinsics/intrinsics.odin
@@ -244,6 +244,11 @@ constant_utf16_cstring :: proc($literal: string) -> [^]u16 ---
 
 constant_log2 :: proc($v: $T) -> T where type_is_integer(T) ---
 
+constant_floor    :: proc($v: $T) -> T where type_is_integer(T) || type_is_float(T) ---
+constant_truncate :: proc($v: $T) -> T where type_is_integer(T) || type_is_float(T) ---
+constant_ceil     :: proc($v: $T) -> T where type_is_integer(T) || type_is_float(T) ---
+constant_round    :: proc($v: $T) -> T where type_is_integer(T) || type_is_float(T) ---
+
 // SIMD related
 simd_add  :: proc(a, b: #simd[N]T) -> #simd[N]T ---
 simd_sub  :: proc(a, b: #simd[N]T) -> #simd[N]T ---
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 = {};
diff --git a/src/checker_builtin_procs.hpp b/src/checker_builtin_procs.hpp
index d8cce71bb..7d2ed1191 100644
--- a/src/checker_builtin_procs.hpp
+++ b/src/checker_builtin_procs.hpp
@@ -49,6 +49,11 @@ enum BuiltinProcId {
 
 	BuiltinProc_constant_log2,
 
+	BuiltinProc_constant_floor,
+	BuiltinProc_constant_truncate,
+	BuiltinProc_constant_ceil,
+	BuiltinProc_constant_round,
+
 	BuiltinProc_transpose,
 	BuiltinProc_outer_product,
 	BuiltinProc_hadamard_product,
@@ -420,7 +425,11 @@ gb_global BuiltinProc builtin_procs[BuiltinProc_COUNT] = {
 
 	{STR_LIT("has_target_feature"), 1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 
-	{STR_LIT("constant_log2"), 1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+	{STR_LIT("constant_log2"),     1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+	{STR_LIT("constant_floor"),    1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+	{STR_LIT("constant_truncate"), 1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+	{STR_LIT("constant_ceil"),     1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+	{STR_LIT("constant_round"),    1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 
 	{STR_LIT("transpose"),        1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("outer_product"),    2, false, Expr_Expr, BuiltinProcPkg_intrinsics},
diff --git a/src/types.cpp b/src/types.cpp
index bf668e5f6..a1311ba5d 100644
--- a/src/types.cpp
+++ b/src/types.cpp
@@ -1296,6 +1296,15 @@ gb_internal bool is_type_rune(Type *t) {
 	}
 	return false;
 }
+gb_internal bool is_type_integer_or_float(Type *t) {
+	t = base_type(t);
+	if (t == nullptr) { return false; }
+	if (t->kind == Type_Basic) {
+		return (t->Basic.flags & (BasicFlag_Integer|BasicFlag_Float)) != 0;
+	}
+	return false;
+}
+
 gb_internal bool is_type_numeric(Type *t) {
 	t = base_type(t);
 	if (t == nullptr) { return false; }