stage2: implement `@truncate`

1 files changed, 11 insertions, 0 deletions

diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index 961ed7ee99..8b3edcfe23 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -960,6 +960,7 @@ pub const FuncGen = struct {
                 .call       => try self.airCall(inst),
                 .cond_br    => try self.airCondBr(inst),
                 .intcast    => try self.airIntCast(inst),
+                .trunc      => try self.airTrunc(inst),
                 .floatcast  => try self.airFloatCast(inst),
                 .ptrtoint   => try self.airPtrToInt(inst),
                 .load       => try self.airLoad(inst),
@@ -1615,6 +1616,16 @@ pub const FuncGen = struct {
         return self.builder.buildIntCast2(operand, try self.dg.llvmType(inst_ty), llvm.Bool.fromBool(signed), "");
     }
 
+    fn airTrunc(self: *FuncGen, inst: Air.Inst.Index) !?*const llvm.Value {
+        if (self.liveness.isUnused(inst))
+            return null;
+
+        const ty_op = self.air.instructions.items(.data)[inst].ty_op;
+        const operand = try self.resolveInst(ty_op.operand);
+        const dest_llvm_ty = try self.dg.llvmType(self.air.typeOfIndex(inst));
+        return self.builder.buildTrunc(operand, dest_llvm_ty, "");
+    }
+
     fn airFloatCast(self: *FuncGen, inst: Air.Inst.Index) !?*const llvm.Value {
         if (self.liveness.isUnused(inst))
             return null;