kvm: Rework VCPU reset

[qemu] / host-utils.h

diff --git a/host-utils.h b/host-utils.h
index d1e89c2..2128615 100644 (file)
--- a/host-utils.h
+++ b/host-utils.h
@@ -23,14 +23,40 @@
  * THE SOFTWARE.
  */
 
-/* Note that some of those functions may end up calling libgcc functions,
-   depending on the host machine. It is up to the target emulation to
-   cope with that. */
+#include "osdep.h"
+
+#if defined(__x86_64__)
+#define __HAVE_FAST_MULU64__
+static always_inline void mulu64 (uint64_t *plow, uint64_t *phigh,
+                                  uint64_t a, uint64_t b)
+{
+    __asm__ ("mul %0\n\t"
+             : "=d" (*phigh), "=a" (*plow)
+             : "a" (a), "0" (b));
+}
+#define __HAVE_FAST_MULS64__
+static always_inline void muls64 (uint64_t *plow, uint64_t *phigh,
+                                  int64_t a, int64_t b)
+{
+    __asm__ ("imul %0\n\t"
+             : "=d" (*phigh), "=a" (*plow)
+             : "a" (a), "0" (b));
+}
+#else
+void muls64(uint64_t *phigh, uint64_t *plow, int64_t a, int64_t b);
+void mulu64(uint64_t *phigh, uint64_t *plow, uint64_t a, uint64_t b);
+#endif
 
 /* Binary search for leading zeros.  */
 
 static always_inline int clz32(uint32_t val)
 {
+#if QEMU_GNUC_PREREQ(3, 4)
+    if (val)
+        return __builtin_clz(val);
+    else
+        return 32;
+#else
     int cnt = 0;
 
     if (!(val & 0xFFFF0000U)) {
@@ -57,6 +83,7 @@ static always_inline int clz32(uint32_t val)
         cnt++;
     }
     return cnt;
+#endif
 }
 
 static always_inline int clo32(uint32_t val)
@@ -66,39 +93,144 @@ static always_inline int clo32(uint32_t val)
 
 static always_inline int clz64(uint64_t val)
 {
+#if QEMU_GNUC_PREREQ(3, 4)
+    if (val)
+        return __builtin_clzll(val);
+    else
+        return 64;
+#else
     int cnt = 0;
 
-    if (!(val & 0xFFFFFFFF00000000ULL)) {
+    if (!(val >> 32)) {
         cnt += 32;
-        val <<= 32;
+    } else {
+        val >>= 32;
     }
-    if (!(val & 0xFFFF000000000000ULL)) {
+
+    return cnt + clz32(val);
+#endif
+}
+
+static always_inline int clo64(uint64_t val)
+{
+    return clz64(~val);
+}
+
+static always_inline int ctz32(uint32_t val)
+{
+#if QEMU_GNUC_PREREQ(3, 4)
+    if (val)
+        return __builtin_ctz(val);
+    else
+        return 32;
+#else
+    int cnt;
+
+    cnt = 0;
+    if (!(val & 0x0000FFFFUL)) {
         cnt += 16;
-        val <<= 16;
+        val >>= 16;
     }
-    if (!(val & 0xFF00000000000000ULL)) {
+    if (!(val & 0x000000FFUL)) {
         cnt += 8;
-        val <<= 8;
+        val >>= 8;
     }
-    if (!(val & 0xF000000000000000ULL)) {
+    if (!(val & 0x0000000FUL)) {
         cnt += 4;
-        val <<= 4;
+        val >>= 4;
     }
-    if (!(val & 0xC000000000000000ULL)) {
+    if (!(val & 0x00000003UL)) {
         cnt += 2;
-        val <<= 2;
+        val >>= 2;
     }
-    if (!(val & 0x8000000000000000ULL)) {
+    if (!(val & 0x00000001UL)) {
         cnt++;
-        val <<= 1;
+        val >>= 1;
     }
-    if (!(val & 0x8000000000000000ULL)) {
+    if (!(val & 0x00000001UL)) {
         cnt++;
     }
+
     return cnt;
+#endif
 }
 
-static always_inline int clo64(uint64_t val)
+static always_inline int cto32(uint32_t val)
 {
-    return clz64(~val);
+    return ctz32(~val);
+}
+
+static always_inline int ctz64(uint64_t val)
+{
+#if QEMU_GNUC_PREREQ(3, 4)
+    if (val)
+        return __builtin_ctz(val);
+    else
+        return 64;
+#else
+    int cnt;
+
+    cnt = 0;
+    if (!((uint32_t)val)) {
+        cnt += 32;
+        val >>= 32;
+    }
+
+    return cnt + ctz32(val);
+#endif
+}
+
+static always_inline int cto64(uint64_t val)
+{
+    return ctz64(~val);
+}
+
+static always_inline int ctpop8(uint8_t val)
+{
+    val = (val & 0x55) + ((val >> 1) & 0x55);
+    val = (val & 0x33) + ((val >> 2) & 0x33);
+    val = (val & 0x0f) + ((val >> 4) & 0x0f);
+
+    return val;
+}
+
+static always_inline int ctpop16(uint16_t val)
+{
+    val = (val & 0x5555) + ((val >> 1) & 0x5555);
+    val = (val & 0x3333) + ((val >> 2) & 0x3333);
+    val = (val & 0x0f0f) + ((val >> 4) & 0x0f0f);
+    val = (val & 0x00ff) + ((val >> 8) & 0x00ff);
+
+    return val;
+}
+
+static always_inline int ctpop32(uint32_t val)
+{
+#if QEMU_GNUC_PREREQ(3, 4)
+    return __builtin_popcount(val);
+#else
+    val = (val & 0x55555555) + ((val >>  1) & 0x55555555);
+    val = (val & 0x33333333) + ((val >>  2) & 0x33333333);
+    val = (val & 0x0f0f0f0f) + ((val >>  4) & 0x0f0f0f0f);
+    val = (val & 0x00ff00ff) + ((val >>  8) & 0x00ff00ff);
+    val = (val & 0x0000ffff) + ((val >> 16) & 0x0000ffff);
+
+    return val;
+#endif
+}
+
+static always_inline int ctpop64(uint64_t val)
+{
+#if QEMU_GNUC_PREREQ(3, 4)
+    return __builtin_popcountll(val);
+#else
+    val = (val & 0x5555555555555555ULL) + ((val >>  1) & 0x5555555555555555ULL);
+    val = (val & 0x3333333333333333ULL) + ((val >>  2) & 0x3333333333333333ULL);
+    val = (val & 0x0f0f0f0f0f0f0f0fULL) + ((val >>  4) & 0x0f0f0f0f0f0f0f0fULL);
+    val = (val & 0x00ff00ff00ff00ffULL) + ((val >>  8) & 0x00ff00ff00ff00ffULL);
+    val = (val & 0x0000ffff0000ffffULL) + ((val >> 16) & 0x0000ffff0000ffffULL);
+    val = (val & 0x00000000ffffffffULL) + ((val >> 32) & 0x00000000ffffffffULL);
+
+    return val;
+#endif
 }