From 6f09a7041ecf328f761df60fae007c800ee1e2ec Mon Sep 17 00:00:00 2001
From: mlugg <mlugg@mlugg.co.uk>
Date: Wed, 19 Apr 2023 01:58:39 +0100
Subject: Begin integrating new liveness analysis into remaining backends

---
 src/codegen/spirv.zig | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/codegen/spirv.zig')

diff --git a/src/codegen/spirv.zig b/src/codegen/spirv.zig
index 58da5539ac..87b72c6726 100644
--- a/src/codegen/spirv.zig
+++ b/src/codegen/spirv.zig
@@ -1507,6 +1507,11 @@ pub const DeclGen = struct {
     }
 
     fn genInst(self: *DeclGen, inst: Air.Inst.Index) !void {
+        // TODO: remove now-redundant isUnused calls from AIR handler functions
+        if (self.liveness.isUnused(inst) and !self.air.mustLower(inst)) {
+            return;
+        }
+
         const air_tags = self.air.instructions.items(.tag);
         const maybe_result_id: ?IdRef = switch (air_tags[inst]) {
             // zig fmt: off
-- 
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