diff --git a/sysdeps/alpha/hp-timing.h b/sysdeps/alpha/hp-timing.h
index 90f9b9d..4cbee66 100644
--- a/sysdeps/alpha/hp-timing.h
+++ b/sysdeps/alpha/hp-timing.h
@@ -42,8 +42,6 @@
    - hp_timing_t: This is the type for variables used to store the time
      values.
 
-   - HP_TIMING_ZERO: clear `hp_timing_t' object.
-
    - HP_TIMING_NOW: place timestamp for current time in variable given as
      parameter.
 
@@ -77,9 +75,6 @@
 /* We use 32 bit values for the times.  */
 typedef unsigned int hp_timing_t;
 
-/* Set timestamp value to zero.  */
-#define HP_TIMING_ZERO(VAR)	(VAR) = (0)
-
 /* The "rpcc" instruction returns a 32-bit counting half and a 32-bit
    "virtual cycle counter displacement".  Subtracting the two gives us
    a virtual cycle count.  */
diff --git a/sysdeps/generic/hp-timing.h b/sysdeps/generic/hp-timing.h
index eddc971..bf78e4e 100644
--- a/sysdeps/generic/hp-timing.h
+++ b/sysdeps/generic/hp-timing.h
@@ -39,8 +39,6 @@
    - hp_timing_t: This is the type for variables used to store the time
      values.
 
-   - HP_TIMING_ZERO: clear `hp_timing_t' object.
-
    - HP_TIMING_NOW: place timestamp for current time in variable given as
      parameter.
 
@@ -68,7 +66,6 @@
 #define HP_TIMING_AVAIL		(0)
 #define HP_TIMING_INLINE	(0)
 typedef int hp_timing_t;
-#define HP_TIMING_ZERO(Var)
 #define HP_TIMING_NOW(var)
 #define HP_TIMING_DIFF_INIT()
 #define HP_TIMING_DIFF(Diff, Start, End)
diff --git a/sysdeps/i386/i686/hp-timing.h b/sysdeps/i386/i686/hp-timing.h
index 4a2006e..18e5b95 100644
--- a/sysdeps/i386/i686/hp-timing.h
+++ b/sysdeps/i386/i686/hp-timing.h
@@ -49,8 +49,6 @@
    - hp_timing_t: This is the type for variables used to store the time
      values.
 
-   - HP_TIMING_ZERO: clear `hp_timing_t' object.
-
    - HP_TIMING_NOW: place timestamp for current time in variable given as
      parameter.
 
@@ -83,9 +81,6 @@
 /* We use 64bit values for the times.  */
 typedef unsigned long long int hp_timing_t;
 
-/* Set timestamp value to zero.  */
-#define HP_TIMING_ZERO(Var)	(Var) = (0)
-
 /* That's quite simple.  Use the `rdtsc' instruction.  Note that the value
    might not be 100% accurate since there might be some more instructions
    running in this moment.  This could be changed by using a barrier like
diff --git a/sysdeps/ia64/hp-timing.h b/sysdeps/ia64/hp-timing.h
index bf97b47..e91326c 100644
--- a/sysdeps/ia64/hp-timing.h
+++ b/sysdeps/ia64/hp-timing.h
@@ -43,8 +43,6 @@
    - hp_timing_t: This is the type for variables used to store the time
      values.
 
-   - HP_TIMING_ZERO: clear `hp_timing_t' object.
-
    - HP_TIMING_NOW: place timestamp for current time in variable given as
      parameter.
 
@@ -77,10 +75,6 @@
 /* We use 64bit values for the times.  */
 typedef unsigned long int hp_timing_t;
 
-/* Set timestamp value to zero.  */
-#define HP_TIMING_ZERO(Var)	(Var) = (0)
-
-
 /* The Itanium/Merced has a bug where the ar.itc register value read
    is not correct in some situations.  The solution is to read again.
    For now we always do this until we know how to recognize a fixed
diff --git a/sysdeps/powerpc/powerpc32/power4/hp-timing.h b/sysdeps/powerpc/powerpc32/power4/hp-timing.h
index f1e3beb..2124e02 100644
--- a/sysdeps/powerpc/powerpc32/power4/hp-timing.h
+++ b/sysdeps/powerpc/powerpc32/power4/hp-timing.h
@@ -42,8 +42,6 @@
    - hp_timing_t: This is the type for variables used to store the time
      values.
 
-   - HP_TIMING_ZERO: clear `hp_timing_t' object.
-
    - HP_TIMING_NOW: place timestamp for current time in variable given as
      parameter.
 
@@ -76,9 +74,6 @@
 /* We use 64bit values for the times.  */
 typedef unsigned long long int hp_timing_t;
 
-/* Set timestamp value to zero.  */
-#define HP_TIMING_ZERO(Var)	(Var) = (0)
-
 /* That's quite simple.  Use the `mftb' instruction.  Note that the value
    might not be 100% accurate since there might be some more instructions
    running in this moment.  This could be changed by using a barrier like
diff --git a/sysdeps/powerpc/powerpc64/hp-timing.h b/sysdeps/powerpc/powerpc64/hp-timing.h
index f1efa12..c773541 100644
--- a/sysdeps/powerpc/powerpc64/hp-timing.h
+++ b/sysdeps/powerpc/powerpc64/hp-timing.h
@@ -42,8 +42,6 @@
    - hp_timing_t: This is the type for variables used to store the time
      values.
 
-   - HP_TIMING_ZERO: clear `hp_timing_t' object.
-
    - HP_TIMING_NOW: place timestamp for current time in variable given as
      parameter.
 
@@ -76,9 +74,6 @@
 /* We use 64bit values for the times.  */
 typedef unsigned long long int hp_timing_t;
 
-/* Set timestamp value to zero.  */
-#define HP_TIMING_ZERO(Var)	(Var) = (0)
-
 /* That's quite simple.  Use the `mftb' instruction.  Note that the value
    might not be 100% accurate since there might be some more instructions
    running in this moment.  This could be changed by using a barrier like
diff --git a/sysdeps/sparc/sparc32/sparcv9/hp-timing.h b/sysdeps/sparc/sparc32/sparcv9/hp-timing.h
index fd7e76e..fbfb861 100644
--- a/sysdeps/sparc/sparc32/sparcv9/hp-timing.h
+++ b/sysdeps/sparc/sparc32/sparcv9/hp-timing.h
@@ -29,8 +29,6 @@
 
 typedef unsigned long long int hp_timing_t;
 
-#define HP_TIMING_ZERO(Var)	(Var) = (0)
-
 #define HP_TIMING_NOW(Var) \
       __asm__ __volatile__ ("rd %%tick, %L0\n\t" \
 			    "srlx %L0, 32, %H0" \
diff --git a/sysdeps/sparc/sparc64/hp-timing.h b/sysdeps/sparc/sparc64/hp-timing.h
index fa08cc8..0773efb 100644
--- a/sysdeps/sparc/sparc64/hp-timing.h
+++ b/sysdeps/sparc/sparc64/hp-timing.h
@@ -29,8 +29,6 @@
 
 typedef unsigned long int hp_timing_t;
 
-#define HP_TIMING_ZERO(Var)	(Var) = (0)
-
 #define HP_TIMING_NOW(Var) __asm__ __volatile__ ("rd %%tick, %0" : "=r" (Var))
 
 #define HP_TIMING_DIFF_INIT() \
