From 2772775d024b202d5879ca694e056754852b19f4 Mon Sep 17 00:00:00 2001
From: Makoto Kato <m_kato@ga2.so-net.ne.jp>
Date: Mon, 13 Jun 2011 17:12:33 +0900
Subject: [PATCH] Bug 662765 - Respect _M_IX86_FP. r=jlebar

---
 xpcom/glue/SSE.h | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/xpcom/glue/SSE.h b/xpcom/glue/SSE.h
index edf16054aa2..b0cc33c6db6 100644
--- a/xpcom/glue/SSE.h
+++ b/xpcom/glue/SSE.h
@@ -171,7 +171,18 @@
   #define MOZILLA_SSE_HAVE_CPUID_DETECTION
 #endif
 
-#if defined(_M_AMD64)
+#if defined(_M_IX86_FP)
+
+#if _M_IX86_FP >= 1
+  // It's ok to use SSE instructions based on the /arch option
+  #define MOZILLA_PRESUME_SSE
+#endif
+#if _M_IX86_FP >= 2
+  // It's ok to use SSE2 instructions based on the /arch option
+  #define MOZILLA_PRESUME_SSE2
+#endif
+
+#elif defined(_M_AMD64)
   // MSVC for AMD64 doesn't support MMX, so don't presume it here.
 
   // SSE is always available on AMD64.