search for: at_hwcap2

..._PPC + info->ppc.arch_2_07 = false; + info->ppc.arch_3_00 = false; + +#if defined(FLAC__CPU_PPC) && defined(HAVE_GETAUXVAL) #ifndef PPC_FEATURE2_ARCH_3_00 #define PPC_FEATURE2_ARCH_3_00 0x00800000 #endif @@ -250,9 +253,6 @@ ppc_cpu_info (FLAC__CPUInfo *info) } else if (getauxval(AT_HWCAP2) & PPC_FEATURE2_ARCH_2_07) { info->ppc.arch_2_07 = true; } -#else - info->ppc.arch_2_07 = false; - info->ppc.arch_3_00 = false; #endif }

...to have a similar discussion for other architectures. One thing that wasn't clear to me from this proposal is how the glibc dynamic loader checks for the CPU feature flags. This is important for valgrind since it can communicate those through different means. cpuid interception, auxv AT_HWCAP/AT_HWCAP2 interception (but not AT_PLATFORM at the moment) and of course we can generate SIGILL for unsupported instructions. We currently don't intercept /proc/cpuinfo (but could). I think it is important to be precise here, because in the past this has sometimes caused confusion. For example for how t...

Most Linux distributions still compile against the original x86-64 baseline that was based on the AMD K8 (minus the 3DNow! parts, for Intel EM64T compatibility). There has been an attempt to use the existing AT_PLATFORM-based loading mechanism in the glibc dynamic linker to enable a selection of optimized libraries. But the general selection mechanism in glibc is problematic: hwcaps

The following series adds initial vector support for PowerPC64. On POWER9, flac --best is about 3.3x faster. Amitay Isaacs (2): Add m4 macro to check for C __attribute__ features Check if compiler supports target attribute on ppc64 Anton Blanchard (5): configure.ac: Remove SPE detection code configure.ac: Add VSX enable/disable configure.ac: Fix FLAC__CPU_PPC on little endian, and add