From: simonmar <unknown>
Date: Fri, 18 Nov 2005 15:13:46 +0000 (+0000)
Subject: [project @ 2005-11-18 15:13:46 by simonmar]
X-Git-Tag: Initial_conversion_from_CVS_complete~39
X-Git-Url: http://git.megacz.com/?a=commitdiff_plain;h=cbd29e0a23bb8e15033edae123d6c8fbe9740c97;p=ghc-hetmet.git

[project @ 2005-11-18 15:13:46 by simonmar]
Add wcStore(), a write-combining store if supported

(I tried using it in the update code and only succeeded in making
things slower, but it might come in handy in the future)
---

diff --git a/ghc/includes/Stg.h b/ghc/includes/Stg.h
index 9977d57..a63b7ec 100644
--- a/ghc/includes/Stg.h
+++ b/ghc/includes/Stg.h
@@ -367,6 +367,24 @@ INLINE_HEADER StgInt64 PK_Int64(W_ p_src[])
 #endif
 
 /* -----------------------------------------------------------------------------
+   Write-combining store
+   -------------------------------------------------------------------------- */
+
+INLINE_HEADER void
+wcStore (StgPtr p, StgWord w)
+{
+#ifdef x86_64_HOST_ARCH    
+    __asm__(
+	"movnti\t%1, %0"
+	: "=m" (*p)
+	: "r" (w)
+	);
+#else
+      *p = w;
+#endif
+}
+
+/* -----------------------------------------------------------------------------
    Integer multiply with overflow
    -------------------------------------------------------------------------- */