diff options
Diffstat (limited to 'host-utils.h')
-rw-r--r-- | host-utils.h | 90 |
1 files changed, 61 insertions, 29 deletions
diff --git a/host-utils.h b/host-utils.h index b1e799e..2128615 100644 --- a/host-utils.h +++ b/host-utils.h @@ -47,14 +47,16 @@ 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 -/* 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. */ - /* 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)) { @@ -81,6 +83,7 @@ static always_inline int clz32(uint32_t val) cnt++; } return cnt; +#endif } static always_inline int clo32(uint32_t val) @@ -90,6 +93,12 @@ 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 >> 32)) { @@ -99,6 +108,7 @@ static always_inline int clz64(uint64_t val) } return cnt + clz32(val); +#endif } static always_inline int clo64(uint64_t val) @@ -106,45 +116,58 @@ static always_inline int clo64(uint64_t val) return clz64(~val); } -static always_inline int ctz32 (uint32_t 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; + cnt += 16; val >>= 16; - } + } if (!(val & 0x000000FFUL)) { - cnt += 8; + cnt += 8; val >>= 8; - } + } if (!(val & 0x0000000FUL)) { - cnt += 4; + cnt += 4; val >>= 4; - } + } if (!(val & 0x00000003UL)) { - cnt += 2; + cnt += 2; val >>= 2; - } + } if (!(val & 0x00000001UL)) { - cnt++; + cnt++; val >>= 1; - } + } if (!(val & 0x00000001UL)) { - cnt++; - } - - return cnt; - } - -static always_inline int cto32 (uint32_t val) - { + cnt++; + } + + return cnt; +#endif +} + +static always_inline int cto32(uint32_t val) +{ return ctz32(~val); } -static always_inline int ctz64 (uint64_t 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; @@ -154,14 +177,15 @@ static always_inline int ctz64 (uint64_t val) } return cnt + ctz32(val); +#endif } -static always_inline int cto64 (uint64_t val) +static always_inline int cto64(uint64_t val) { return ctz64(~val); } -static always_inline int ctpop8 (uint8_t val) +static always_inline int ctpop8(uint8_t val) { val = (val & 0x55) + ((val >> 1) & 0x55); val = (val & 0x33) + ((val >> 2) & 0x33); @@ -170,7 +194,7 @@ static always_inline int ctpop8 (uint8_t val) return val; } -static always_inline int ctpop16 (uint16_t val) +static always_inline int ctpop16(uint16_t val) { val = (val & 0x5555) + ((val >> 1) & 0x5555); val = (val & 0x3333) + ((val >> 2) & 0x3333); @@ -180,8 +204,11 @@ static always_inline int ctpop16 (uint16_t val) return val; } -static always_inline int ctpop32 (uint32_t 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); @@ -189,10 +216,14 @@ static always_inline int ctpop32 (uint32_t val) val = (val & 0x0000ffff) + ((val >> 16) & 0x0000ffff); return val; +#endif } -static always_inline int ctpop64 (uint64_t val) +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); @@ -201,4 +232,5 @@ static always_inline int ctpop64 (uint64_t val) val = (val & 0x00000000ffffffffULL) + ((val >> 32) & 0x00000000ffffffffULL); return val; +#endif } |