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Apple has implemented blocks both in their own branch of the GNU Compiler Collection [1] and in the upstream Clang LLVM compiler front end. Language runtime library support for blocks is also available as part of the LLVM project. The Khronos group uses blocks syntax to enqueue kernels from within kernels as of version 2.0 of OpenCL. [5]
Service interface function block – SIFB: The source code is hidden and its functionality is only described by service sequences. Basic function block - BFB: Its functionality is described in terms of an Execution Control Chart (ECC), which is similar to a state diagram (UML). Every state can have several actions.
ARM's Thumb instruction set (1994) dropped conditional execution to reduce the size of instructions so they could fit in 16 bits, but its successor, Thumb-2 (2003) overcame this problem by using a special instruction which has no effect other than to supply predicates for the following four instructions. The 64-bit instruction set introduced in ...
There are three types of lifetimes in C: static (program execution), automatic (block execution, allocated on the stack), and manual (allocated on the heap). Only static and automatic are supported for variables and handled by the compiler, while manually allocated memory must be tracked manually across different variables.
special, read-only, platform-specific registers.const shared, read-only memory.global global memory, shared by all threads.local local memory, private to each thread.param parameters passed to the kernel.shared memory shared between threads in a block.tex global texture memory (deprecated)
So the first byte held a map for blocks 0 to 7, the second byte held a map for blocks 8 to 15, and so on. Within a byte, the bitmap was ordered low-bit first. For example, the first byte would represent block 0 with the least significant bit and block 7 with the most significant bit.
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[b] The suspend i stops execution and returns the value of i without reseting any of the state. When another call is made to the same function, execution picks up at that point with the previous values. In this case, that causes it to perform i +:= 1, loop back to the start of the while block, and then return the next value and suspend again.