From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- mozglue/build/ppc.cpp | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 mozglue/build/ppc.cpp (limited to 'mozglue/build/ppc.cpp') diff --git a/mozglue/build/ppc.cpp b/mozglue/build/ppc.cpp new file mode 100644 index 0000000000..20ef121386 --- /dev/null +++ b/mozglue/build/ppc.cpp @@ -0,0 +1,64 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* compile-time and runtime tests for whether to use Power ISA-specific + * extensions */ + +#include "ppc.h" +#include "mozilla/Unused.h" + +#include +#include + +#if defined(XP_LINUX) +// Use the getauxval() function if available. +// ARCH_3_00 wasn't defined until glibc 2.23, so include just in case. +# include +# ifndef PPC_FEATURE2_ARCH_3_00 +# define PPC_FEATURE2_ARCH_3_00 0x00800000 +# endif +#endif + +const unsigned PPC_FLAG_VMX = 1; +const unsigned PPC_FLAG_VSX = 2; +const unsigned PPC_FLAG_VSX3 = 4; + +static signed get_ppc_cpu_flags(void) { + // This could be expensive, so cache the result. + static signed cpu_flags = -1; + + if (cpu_flags > -1) { // already checked + return cpu_flags; + } + cpu_flags = 0; + +#if defined(XP_LINUX) + // Try getauxval(). + unsigned long int cap = getauxval(AT_HWCAP); + unsigned long int cap2 = getauxval(AT_HWCAP2); + + if (cap & PPC_FEATURE_HAS_ALTIVEC) { + cpu_flags |= PPC_FLAG_VMX; + } + if (cap & PPC_FEATURE_HAS_VSX) { + cpu_flags |= PPC_FLAG_VSX; + } + if (cap2 & PPC_FEATURE2_ARCH_3_00) { + cpu_flags |= PPC_FLAG_VSX3; + } +#else + // Non-Linux detection here. Currently, on systems other than Linux, + // no CPU SIMD features will be detected. +#endif + + return cpu_flags; +} + +namespace mozilla { +namespace ppc_private { +bool vmx_enabled = !!(get_ppc_cpu_flags() & PPC_FLAG_VMX); +bool vsx_enabled = !!(get_ppc_cpu_flags() & PPC_FLAG_VSX); +bool vsx3_enabled = !!(get_ppc_cpu_flags() & PPC_FLAG_VSX3); +} // namespace ppc_private +} // namespace mozilla -- cgit v1.2.3