LLVM Language Reference Manual. Abstract; Introduction. History of docs / @. The LLVM compiler infrastructure project is a “collection of modular and reusable compiler and .. For the full documentation, refer to ^ Stellard, Tom (March 26, ). “[LLVMdev] RFC: R, a new backend for.

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Metadata nodes but not metadata strings are the only valid operands for a named metadata. The benefit of this exception-free assumption is that floating-point operations may be speculated freely without any other fast-math relaxations to the floating-point model. Otherwise, the result is an i1. On an argument, this attribute indicates that the function does not dereference that pointer argument, even though it may read or write the memory that the pointer points to if accessed through other pointers.

The type of each index argument depends on the type it is indexing into.


If the cmpxchg operation is marked as weak then a spurious failure is permitted: Any stores into the memory object following this intrinsic may be removed as dead. In non-packed structs, padding between field types is inserted as defined by the DataLayout string in the module, which is required to match what the underlying code generator expects. The token argument must be lanfref token produced by a catchpad instruction. Otherwise R byte returns undef.

LLVM Language Reference Manual — LLVM 8 documentation

Note that if not all memory access instructions belong to an access group referred to by llvm. This section describes them all and their syntax. The argument to the load instruction specifies the memory address from which to load. Binary operators are used to do most of the computation in a program.

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It loads a value in memory and compares it to a given value. If the catchswitch is not inside a funclet, this operand may be the token none. This attribute indicates that calls to the function cannot be duplicated. LLVM allows an explicit section to be specified for globals.

Floating point constants Floating point constants use standard decimal notation kangref. For definitions, a global value will contain a list of summaries, one per module containing a definition.

IFuncs have a name and a resolver that is a function called by dynamic linker that returns address of another function associated with the name. However, a store to an undefined location could clobber arbitrary memory, therefore, it has undefined behavior.

This metadata selectively enables or disables vectorization for the loop. If the scope is a composite type with an ODR identifier: Undefined values are useful because they indicate to the compiler that the program is well defined no matter what value is used. Pointer values are associated with address ranges according to the following rules: For declarations, there will not be a summary list.

The operation must be one of the following keywords:. Because of this, the LLVM code for the given testcase is equivalent to: When a non-anonymous record is defined in a multiclass and the given name does not contain a reference to the implicit template argument NAMEsuch a reference will automatically be prepended.

If the global value is an alias, the Summary entry will look like:. Each module may only have one flag entry for each unique ID not including entries with the Require behavior. A successful cmpxchg is a read-modify-write instruction for the purpose of identifying release sequences. A self-reference can be used to create globally unique domain names.

DIGlobalVariable nodes represent global variables in the source language. The value produced is the floating point difference of the two operands. The only in bounds address for a null pointer in the default address-space is the null pointer itself. This implies that jumps to labels defined in lagnref functions have undefined behavior as well.


Its president is compiler engineer Tanya Lattner. Address must be derived from a blockaddress constant. Attributes specified in the metadata is added to all llvm. A key design point of an SSA-based representation is how it represents memory.

TYPE must be a pointer type. Introducing a data race is not allowed. Note that program order does not introduce happens-before edges between a thread and signals executing inside that thread. The first class types are perhaps the most important. In general, a module is made up of a list of global values where both functions and global variables are global values. Speculative Load Hardening is a best-effort mitigation against information leak attacks that make use of control flow miss-speculation – specifically miss-speculation of whether a branch is taken or not.

R returns the value composed of the series of bytes it read. The second argument is a constant integer representing the size of the object, lvlm -1 if it is variable sized and the third argument is a pointer to the object. The defaults are Unknown and 0respectively. Note that this attribute langgref additional semantics when combined with the byval attribute.

If value is smaller than ty2 then a zero extension is done.