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https://developer.arm.com/architectures/instruction-sets/floating-point
The Arm architecture provides high-performance and high-efficiency hardware support for floating-point operations in half-, single-, and double-precision arithmetic. It is fully IEEE-754 compliant with full software library support.
http://infocenter.arm.com/help/topic/com.arm.doc.kui0097a/armcc_cjaidcjb.htm
The ARM processor core does not contain floating-point hardware. Floating-point arithmetic must be supported separately, either: In software, through the floating-point library fplib. This library provides functions that can be called to implement floating-point operations using no additional hardware.
https://embeddedartistry.com/blog/2017/10/11/demystifying-arm-floating-point-compiler-options/
Oct 11, 2017 · Vector Floating Point (VFP) is the name for ARM’s floating-point extension. Prior to ARMv8, VFP was implemented as a coprocessor extension. The VFP coprocessor supports both single and double-precision floating point operations according to the IEEE 754 standard.
https://stackoverflow.com/questions/10585208/gnu-arm-toolchain-with-hardware-floating-point-support
I just wrote an article about using ARM's free GCC toolchain (GNU Tools for ARM Embedded Processors) and STLINK on Linux/Ubuntu to write/program/debug code for an STM32F4 Discovery Board (the F4 is a Cortex M4) - that may help you, the compiler does have hardware floating point support and I'm using it in my examples...
https://community.arm.com/developer/ip-products/processors/b/processors-ip-blog/posts/10-useful-tips-to-using-the-floating-point-unit-on-the-arm-cortex--m4-processor
Oct 25, 2013 · The Arm Cortex-M4 processor addresses application areas requiring a blend of traditional microcontroller functionality and digital signal processing - this is often called a Digital Signal Controller. One of the optional features which a licensee of the Cortex-M4 can include in their design is a powerful Floating Point Unit (FPU).
http://www.keil.com/support/docs/3716.htm
Jan 25, 2017 · QUESTION: I know that Cortex-M7 has the option to support a hardware Floating Point Unit (FPU). For instance, I'm using the device Atmel ATSAMV71 that has the hardware FPU support for double floating-point operations. How can I enable this hardware FPU support in my project? ANSWER: For this spec...
https://unix.stackexchange.com/questions/184874/how-do-determine-whether-linux-board-is-using-hardware-fpu-or-not
In the ARM world from ARMv4 to ARMv7 floating-point support is called VFP, and hardware support for it appears in the Features line of /proc/cpuinfo or in the VFP support log message printed by the kernel while booting. (In ARMv8 it's just "FP".) In /proc/cpuinfo on an Allwinner A20 this gives:
http://www.keil.com/support/man/docs/armcc/armcc_chr1359124231692.htm
Non-Confidential PDF versionARM DUI0375H ARM® Compiler v5.06 for µVision® armcc User GuideVersion 5Home > Compiler Coding Practices > Example of hardware and software support differences for floating-point arithmetic 4.43 Example of hardware and software support differences for floating-point arithmetic This example shows how the compiler deals with floating-point …
https://en.wikipedia.org/wiki/Floating-point_unit
Some floating-point hardware only supports the simplest operations: addition, subtraction, and multiplication. But even the most complex floating-point hardware has a finite number of operations it can support – for example, no FPUs directly support arbitrary-precision arithmetic.
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