Add `intrinsics.mem_zero`

1 files changed, 14 insertions, 2 deletions

diff --git a/src/llvm_backend.cpp b/src/llvm_backend.cpp
index b622d1729..74c6cfc11 100644
--- a/src/llvm_backend.cpp
+++ b/src/llvm_backend.cpp
@@ -9478,8 +9478,6 @@ lbValue lb_build_builtin_proc(lbProcedure *p, Ast *expr, TypeAndValue const &tv,
 	case BuiltinProc_mem_copy:
 	case BuiltinProc_mem_copy_non_overlapping:
 		{
-
-
 			lbValue dst = lb_build_expr(p, ce->args[0]);
 			lbValue src = lb_build_expr(p, ce->args[1]);
 			lbValue len = lb_build_expr(p, ce->args[2]);
@@ -9513,6 +9511,20 @@ lbValue lb_build_builtin_proc(lbProcedure *p, Ast *expr, TypeAndValue const &tv,
 			return {};
 		}
 
+	case BuiltinProc_mem_zero:
+		{
+			lbValue ptr = lb_build_expr(p, ce->args[0]);
+			lbValue len = lb_build_expr(p, ce->args[1]);
+			ptr = lb_emit_conv(p, ptr, t_rawptr);
+			len = lb_emit_conv(p, len, t_int);
+
+			LLVMTypeRef type_i8 = LLVMInt8TypeInContext(p->module->ctx);
+			unsigned alignment = 1;
+			LLVMBuildMemSet(p->builder, ptr.value, LLVMConstNull(type_i8), len.value, alignment);
+
+			return {};
+		}
+
 
 	case BuiltinProc_atomic_fence:
 		LLVMBuildFence(p->builder, LLVMAtomicOrderingSequentiallyConsistent, false, "");