From 613f39eb622d341d036ef418b19778d1f04d5a47 Mon Sep 17 00:00:00 2001
From: gracefu <81774659+gracefuu@users.noreply.github.com>
Date: Sat, 10 Apr 2021 14:01:09 +0800
Subject: [PATCH] stage2 x86_64: fix comptime integer multiplication when rhs=0

Co-authored-by: joachimschmidt557 <joachim.schmidt557@outlook.com>
---
 src/Sema.zig | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/Sema.zig b/src/Sema.zig
index 74af84b078..65a196911e 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -3864,10 +3864,15 @@ fn analyzeArithmetic(
             // incase rhs is 0, simply return lhs without doing any calculations
             // TODO Once division is implemented we should throw an error when dividing by 0.
             if (rhs_val.compareWithZero(.eq)) {
-                return sema.mod.constInst(sema.arena, src, .{
-                    .ty = scalar_type,
-                    .val = lhs_val,
-                });
+                switch (zir_tag) {
+                    .add, .addwrap, .sub, .subwrap => {
+                        return sema.mod.constInst(sema.arena, src, .{
+                            .ty = scalar_type,
+                            .val = lhs_val,
+                        });
+                    },
+                    else => {},
+                }
             }
 
             const value = switch (zir_tag) {