From d13f30e08fb35ccc5afdebad87851637733ade1e Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Tue, 13 Nov 2007 09:46:38 -0800
Subject: x86-host-specific performance improvement

If we're on an x86 host, we can do unaligned littleendian memory
references directly.  Just do'em.
---
 nasmlib.h | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

(limited to 'nasmlib.h')

diff --git a/nasmlib.h b/nasmlib.h
index 2e18f10c..15f69844 100644
--- a/nasmlib.h
+++ b/nasmlib.h
@@ -178,6 +178,41 @@ void standard_extension(char *inname, char *outname, char *extension,
  * format in memory
  */
 
+#if X86_MEMORY
+
+#define WRITECHAR(p,v)				\
+    do {					\
+	*(uint8_t *)(p) = (v);			\
+	(p) += 1;				\
+    } while (0)
+
+#define WRITESHORT(p,v)				\
+    do {					\
+	*(uint16_t *)(p) = (v);			\
+	(p) += 2;				\
+    } while (0)
+
+#define WRITELONG(p,v)				\
+    do {					\
+	*(uint32_t *)(p) = (v);			\
+	(p) += 4;				\
+    } while (0)
+
+#define WRITEDLONG(p,v)				\
+    do {					\
+	*(uint64_t *)(p) = (v);			\
+	(p) += 8;				\
+    } while (0)
+
+#define WRITEADDR(p,v,s)			\
+    do {					\
+	uint64_t _v = (v);			\
+	memcpy((p), &_v, (s));			\
+	(p) += (s);				\
+    } while (0)
+
+#else /* !X86_MEMORY */
+
 #define WRITECHAR(p,v) \
   do { \
     *(p)++ = (v) & 0xFF; \
@@ -219,6 +254,8 @@ void standard_extension(char *inname, char *outname, char *extension,
 	}					\
     } while(0)
 
+#endif
+
 /*
  * and routines to do the same thing to a file
  */
-- 
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