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On x86 and x86-64, the most common C/C++ compilers implement long double as either 80-bit extended precision (e.g. the GNU C Compiler gcc [13] and the Intel C++ Compiler with a /Qlong‑double switch [14]) or simply as being synonymous with double precision (e.g. Microsoft Visual C++ [15]), rather than as quadruple precision.
An ARMv8-A processor can support one or both of AArch32 and AArch64; it may support AArch32 and AArch64 at lower Exception levels and only AArch64 at higher Exception levels. [9] For example, the ARM Cortex-A32 supports only AArch32, [10] the ARM Cortex-A34 supports only AArch64, [11] and the ARM Cortex-A72 supports both AArch64 and AArch32. [12]
This is a table of 64/32-bit central processing units that implement the ARMv8-A instruction set architecture and mandatory or optional extensions of it. Most chips support the 32-bit ARMv7-A for legacy applications.
Application profile, AArch64, 1–8 SMP cores, TrustZone, NEON advanced SIMD, VFPv4, hardware virtualization, 2-wide decode superscalar, 3-width issue, 10 stage pipeline, out-of-order pipeline, SMT 32−64 KB / 32−64 KB L1, 256 KB L2 per core, 4 MB L3 shared
An ARMv8-A processor can support one or both of AArch32 and AArch64; it may support AArch32 and AArch64 at lower Exception levels and only AArch64 at higher Exception levels. [162] For example, the ARM Cortex-A32 supports only AArch32, [ 163 ] the ARM Cortex-A34 supports only AArch64, [ 164 ] and the ARM Cortex-A72 supports both AArch64 and ...
Microsoft Windows with Visual C++ also sets the processor in double-precision mode by default, but this can again be overridden within an individual program (e.g. by the _controlfp_s function in Visual C++ [24]). The Intel C++ Compiler for x86, on the other hand, enables extended-precision mode by default. [25]
An instruction set architecture (ISA) is an abstract model of a computer, also referred to as computer architecture.A realization of an ISA is called an implementation.An ISA permits multiple implementations that may vary in performance, physical size, and monetary cost (among other things); because the ISA serves as the interface between software and hardware.
And, according to the Arm Architecture Reference Manual Supplement - Armv8, for Armv8-R AArch64 architecture profile, section B1.1: The Armv8-R AArch64 application level programmers’ model differs from the Armv8-A AArch64 profile in the following ways: Armv8-R AArch64 supports only a single Security state, Secure. EL2 is mandatory.