diff options
Diffstat (limited to 'src/corelib/tools/qsimd_p.h')
| -rw-r--r-- | src/corelib/tools/qsimd_p.h | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/src/corelib/tools/qsimd_p.h b/src/corelib/tools/qsimd_p.h index 12a329f36c..dedee06e38 100644 --- a/src/corelib/tools/qsimd_p.h +++ b/src/corelib/tools/qsimd_p.h @@ -73,6 +73,7 @@ * SSE4_2 | x86 | I & C | I & C | I only | * AVX | x86 | I & C | I & C | I & C | * AVX2 | x86 | I & C | I & C | I only | + * AVX512xx | x86 | I & C | I & C | I only | * I = intrinsics; C = code generation * * Code can use the following constructs to determine compiler support & status: @@ -430,7 +431,23 @@ static inline quint64 qCpuFeatures() #define qCpuHasFeature(feature) ((qCompilerCpuFeatures & (Q_UINT64_C(1) << CpuFeature ## feature)) \ || (qCpuFeatures() & (Q_UINT64_C(1) << CpuFeature ## feature))) -#ifdef Q_PROCESSOR_X86 +#if QT_HAS_BUILTIN(__builtin_clz) && QT_HAS_BUILTIN(__builtin_ctz) && defined(Q_CC_CLANG) && !defined(Q_CC_INTEL) +static Q_ALWAYS_INLINE unsigned _bit_scan_reverse(unsigned val) +{ + Q_ASSERT(val != 0); // if val==0, the result is undefined. + unsigned result = static_cast<unsigned>(__builtin_clz(val)); // Count Leading Zeros + // Now Invert the result: clz will count *down* from the msb to the lsb, so the msb index is 31 + // and the lsb inde is 0. The result for _bit_scan_reverse is expected to be the index when + // counting up: msb index is 0 (because it starts there), and the lsb index is 31. + result ^= sizeof(unsigned) * 8 - 1; + return result; +} +static Q_ALWAYS_INLINE unsigned _bit_scan_forward(unsigned val) +{ + Q_ASSERT(val != 0); // if val==0, the result is undefined. + return static_cast<unsigned>(__builtin_ctz(val)); // Count Trailing Zeros +} +#elif defined(Q_PROCESSOR_X86) // Bit scan functions for x86 # if defined(Q_CC_MSVC) && !defined(Q_OS_WINCE) // MSVC calls it _BitScanReverse and returns the carry flag, which we don't need |