svn commit: r334890 - in head/sys: amd64/include i386/include

[Mark Johnston]

Author: markj
Date: Sat Jun  9 18:31:19 2018
New Revision: 334890
URL: https://svnweb.freebsd.org/changeset/base/334890

Log:
  Tell the compiler that rdtscp clobbers %ecx.

Modified:
  head/sys/amd64/include/cpufunc.h
  head/sys/i386/include/cpufunc.h

Modified: head/sys/amd64/include/cpufunc.h
==============================================================================
--- head/sys/amd64/include/cpufunc.h	Sat Jun  9 18:11:46 2018	(r334889)
+++ head/sys/amd64/include/cpufunc.h	Sat Jun  9 18:31:19 2018	(r334890)
@@ -391,7 +391,7 @@ rdtscp(void)
 {
 	uint32_t low, high;
 
-	__asm __volatile("rdtscp" : "=a" (low), "=d" (high));
+	__asm __volatile("rdtscp" : "=a" (low), "=d" (high) : : "ecx");
 	return (low | ((uint64_t)high << 32));
 }
 

Modified: head/sys/i386/include/cpufunc.h
==============================================================================
--- head/sys/i386/include/cpufunc.h	Sat Jun  9 18:11:46 2018	(r334889)
+++ head/sys/i386/include/cpufunc.h	Sat Jun  9 18:31:19 2018	(r334890)
@@ -373,7 +373,7 @@ rdtscp(void)
 {
 	uint64_t rv;
 
-	__asm __volatile("rdtscp" : "=A" (rv));
+	__asm __volatile("rdtscp" : "=A" (rv) : : "ecx");
 	return (rv);
 }