Add shared ctz32, cto32, ctz64, cto64,
ctpop8, ctpop16, ctpop32 and ctpop64 helpers.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3465 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/host-utils.h b/host-utils.h
index d1e89c2..fe306f6 100644
--- a/host-utils.h
+++ b/host-utils.h
@@ -102,3 +102,100 @@
{
return clz64(~val);
}
+
+static always_inline int ctz32 (uint32_t val)
+{
+ int cnt;
+
+ cnt = 0;
+ if (!(val & 0x0000FFFFUL)) {
+ cnt += 16;
+ val >>= 16;
+ }
+ if (!(val & 0x000000FFUL)) {
+ cnt += 8;
+ val >>= 8;
+ }
+ if (!(val & 0x0000000FUL)) {
+ cnt += 4;
+ val >>= 4;
+ }
+ if (!(val & 0x00000003UL)) {
+ cnt += 2;
+ val >>= 2;
+ }
+ if (!(val & 0x00000001UL)) {
+ cnt++;
+ val >>= 1;
+ }
+ if (!(val & 0x00000001UL)) {
+ cnt++;
+ }
+
+ return cnt;
+ }
+
+static always_inline int cto32 (uint32_t val)
+ {
+ return ctz32(~val);
+}
+
+static always_inline int ctz64 (uint64_t val)
+{
+ int cnt;
+
+ cnt = 0;
+ if (!((uint32_t)val)) {
+ cnt += 32;
+ val >>= 32;
+ }
+
+ return cnt + ctz32(val);
+}
+
+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)
+{
+ 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;
+}
+
+static always_inline int ctpop64 (uint64_t val)
+{
+ 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;
+ }
