diff --git a/src/cuda-crypt/perftime.h b/src/common/perftime.h
similarity index 100%
rename from src/cuda-crypt/perftime.h
rename to src/common/perftime.h
diff --git a/src/cuda-ecc-ed25519/perftime.h b/src/cuda-ecc-ed25519/perftime.h
deleted file mode 100644
index fddd509..0000000
--- a/src/cuda-ecc-ed25519/perftime.h
+++ /dev/null
@@ -1,50 +0,0 @@
-#ifndef PERFTIME_H
-#define PERFTIME_H
-
-#ifdef USE_RDTSC
-static inline uint64_t rdtsc()
-{
-    unsigned int hi, lo;
-    __asm__ volatile("rdtsc" : "=a" (lo), "=d" (hi));
-    return ((uint64_t)hi << 32) | lo;
-}
-
-typedef struct {
-    uint64_t count;
-} perftime_t;
-
-#elif defined(USE_CLOCK_GETTIME)
-#include <time.h>
-typedef struct timespec perftime_t;
-#else
-#include <sys/time.h>
-typedef struct timeval perftime_t;
-#endif
-
-static int get_time(perftime_t* t) {
-#ifdef USE_RDTSC
-    t->count = rdtsc();
-    return 0;
-#elif defined(USE_CLOCK_GETTIME)
-    return clock_gettime(CLOCK_MONOTONIC_RAW, t);
-    //return clock_gettime(CLOCK_PROCESS_CPUTIME_ID, t);
-#else
-    return gettimeofday(t, NULL /* timezone */);
-#endif
-}
-
-static double get_us(const perftime_t* time) {
-#ifdef USE_RDTSC
-    return time->count;
-#elif defined(USE_CLOCK_GETTIME)
-    return ((time->tv_nsec/1000) + (double)time->tv_sec * 1000000);
-#else
-    return (time->tv_usec + (double)time->tv_sec * 1000000);
-#endif
-}
-
-static double get_diff(const perftime_t* start, const perftime_t* end) {
-    return get_us(end) - get_us(start);
-}
-
-#endif
diff --git a/src/gpu-common.mk b/src/gpu-common.mk
index 460b14e..a29595f 100644
--- a/src/gpu-common.mk
+++ b/src/gpu-common.mk
@@ -2,6 +2,6 @@ NVCC:=nvcc
 GPU_PTX_ARCH:=compute_35
 GPU_ARCHS?=sm_37,sm_50,sm_61,sm_70
 GPU_CFLAGS:=--gpu-code=$(GPU_ARCHS),$(GPU_PTX_ARCH) --gpu-architecture=$(GPU_PTX_ARCH)
-CFLAGS_release:=--ptxas-options=-v $(GPU_CFLAGS) -O3 -Xcompiler "-Wall -Werror -fPIC -Wno-strict-aliasing"
+CFLAGS_release:=-Icommon --ptxas-options=-v $(GPU_CFLAGS) -O3 -Xcompiler "-Wall -Werror -fPIC -Wno-strict-aliasing"
 CFLAGS_debug:=$(CFLAGS_release) -g
 CFLAGS:=$(CFLAGS_$V)