From 43039ef5c0475fa39b6c443000afd868c27c9168 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Wed, 3 Jan 2018 16:02:35 -0800
Subject: [PATCH] Add an exception for vzeroall/vzeroupper on Windows

These apparently blow the 20 intstruction limit with all the loads/stores.
---
 stdsimd-test/src/lib.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/stdsimd-test/src/lib.rs b/stdsimd-test/src/lib.rs
index ccd5bb58e7..d41bec2564 100644
--- a/stdsimd-test/src/lib.rs
+++ b/stdsimd-test/src/lib.rs
@@ -327,6 +327,13 @@ pub fn assert(fnptr: usize, fnname: &str, expected: &str) {
         // cpuid returns a pretty big aggregate structure so excempt it from the
         // slightly more restrictive 20 instructions below
         "cpuid" => 30,
+
+        // Apparently on Windows LLVM generates a bunch of saves/restores of xmm
+        // registers around these intstructions which blows the 20 limit
+        // below. As it seems dictates by Windows's abi (I guess?) we probably
+        // can't do much about it...
+        "vzeroall" | "vzeroupper" if cfg!(windows) => 30,
+
         _ => 20,
     };
     let probably_only_one_instruction =