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);
}
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