[Qemu-devel] [PATCH v2 6/6] Make pow2ceil() and pow2floor() inline

[Peter Maydell <peter.maydell@linaro.org>]

Since the pow2floor() function is now used in a hot code path,
make it inline; for consistency, provide pow2ceil() as an inline
function too.

Because these functions use ctz64() we have to put the inline
versions into host-utils.h, so they have access to ctz64(),
and move the inline is_power_of_2() along with them.

We then need to include host-utils.h from qemu-common.h so that
the files which use these functions via qemu-common.h still have
access to them.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 include/qemu-common.h     | 16 +---------------
 include/qemu/host-utils.h | 33 +++++++++++++++++++++++++++++++++
 util/cutils.c             | 23 -----------------------
 3 files changed, 34 insertions(+), 38 deletions(-)

diff --git a/include/qemu-common.h b/include/qemu-common.h
index bc6f8f8..3d4279c 100644
--- a/include/qemu-common.h
+++ b/include/qemu-common.h
@@ -43,6 +43,7 @@
 #include <signal.h>
 #include "glib-compat.h"
 #include "qemu/option.h"
+#include "qemu/host-utils.h"
 
 #ifdef _WIN32
 #include "sysemu/os-win32.h"
@@ -405,21 +406,6 @@ static inline uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
 /* Round number up to multiple */
 #define QEMU_ALIGN_UP(n, m) QEMU_ALIGN_DOWN((n) + (m) - 1, (m))
 
-static inline bool is_power_of_2(uint64_t value)
-{
-    if (!value) {
-        return 0;
-    }
-
-    return !(value & (value - 1));
-}
-
-/* round down to the nearest power of 2*/
-int64_t pow2floor(int64_t value);
-
-/* round up to the nearest power of 2 (0 if overflow) */
-uint64_t pow2ceil(uint64_t value);
-
 #include "qemu/module.h"
 
 /*
diff --git a/include/qemu/host-utils.h b/include/qemu/host-utils.h
index d4f21c9..9ed5cdd 100644
--- a/include/qemu/host-utils.h
+++ b/include/qemu/host-utils.h
@@ -27,6 +27,7 @@
 
 #include "qemu/compiler.h"   /* QEMU_GNUC_PREREQ */
 #include <limits.h>
+#include <stdbool.h>
 
 #ifdef CONFIG_INT128
 static inline void mulu64(uint64_t *plow, uint64_t *phigh,
@@ -379,4 +380,36 @@ static inline int ctpop64(uint64_t val)
 # error Unknown sizeof long
 #endif
 
+static inline bool is_power_of_2(uint64_t value)
+{
+    if (!value) {
+        return 0;
+    }
+
+    return !(value & (value - 1));
+}
+
+/* round down to the nearest power of 2*/
+static inline int64_t pow2floor(int64_t value)
+{
+    if (!is_power_of_2(value)) {
+        value = 0x8000000000000000ULL >> clz64(value);
+    }
+    return value;
+}
+
+/* round up to the nearest power of 2 (0 if overflow) */
+static inline uint64_t pow2ceil(uint64_t value)
+{
+    uint8_t nlz = clz64(value);
+
+    if (is_power_of_2(value)) {
+        return value;
+    }
+    if (!nlz) {
+        return 0;
+    }
+    return 1ULL << (64 - nlz);
+}
+
 #endif
diff --git a/util/cutils.c b/util/cutils.c
index 43aafde..9234452 100644
--- a/util/cutils.c
+++ b/util/cutils.c
@@ -469,29 +469,6 @@ int qemu_parse_fd(const char *param)
     return fd;
 }
 
-/* round down to the nearest power of 2*/
-int64_t pow2floor(int64_t value)
-{
-    if (!is_power_of_2(value)) {
-        value = 0x8000000000000000ULL >> clz64(value);
-    }
-    return value;
-}
-
-/* round up to the nearest power of 2 (0 if overflow) */
-uint64_t pow2ceil(uint64_t value)
-{
-    uint8_t nlz = clz64(value);
-
-    if (is_power_of_2(value)) {
-        return value;
-    }
-    if (!nlz) {
-        return 0;
-    }
-    return 1ULL << (64 - nlz);
-}
-
 /*
  * Implementation of  ULEB128 (http://en.wikipedia.org/wiki/LEB128)
  * Input is limited to 14-bit numbers
-- 
1.9.1