From f3ba72cf5a7e2c40c6a10fd987e7f4486c2b9300 Mon Sep 17 00:00:00 2001
From: Jacob G-W <jacoblevgw@gmail.com>
Date: Wed, 10 Nov 2021 14:25:43 -0500
Subject: [PATCH] x86_64/Emit: don't misisel push/pop for extended regs

---
 src/arch/x86_64/Emit.zig | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/arch/x86_64/Emit.zig b/src/arch/x86_64/Emit.zig
index 3c53e5f680..7430b8065b 100644
--- a/src/arch/x86_64/Emit.zig
+++ b/src/arch/x86_64/Emit.zig
@@ -197,7 +197,10 @@ fn mirPushPop(emit: *Emit, tag: Mir.Inst.Tag, inst: Mir.Inst.Index) InnerError!v
                 .pop => 0x58,
                 else => unreachable,
             };
-            const encoder = try Encoder.init(emit.code, 1);
+            const encoder = try Encoder.init(emit.code, 2);
+            encoder.rex(.{
+                .b = ops.reg1.isExtended(),
+            });
             encoder.opcode_withReg(opc, ops.reg1.lowId());
         },
         0b01 => {