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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Only values of first class types of known size i. Finally, some targets may provide defined semantics when using the value lanhref the operand to an inline assembly, but that is target specific.
If two or more llfm are lvm together their garbage collection metadata needs to be merged rather than appended together. Arrays and structs are aggregate types. Use bitcast to make a no-op cast for a floating-point cast. This function returns the same values as the libm exp functions would, and handles error conditions in the same way.
For example, in the code below, the block header0 may lajgref a loop header weight langgef to the other headers of the irreducible loop of For example, the following defines a global in a numbered address space with an initializer, section, and alignment:. Division by zero is undefined behavior. This intrinsic indicates that after this point in the code, the value of the memory pointed to by ptr is dead.
For more details, see GC Transitions. If not present, or if the alignment is set to zero, the alignment of the global is set by the target to whatever it feels convenient. The constraint list is a comma-separated string, each element containing one or more constraint codes. Both types must be of integer types, or vectors of the same number of integers.
The bit size of the value must be smaller than the bit size of the destination type, ty2. This calling convention, like the PreserveMost calling convention, will be used by a future version of the ObjectiveC runtime and should be considered lanvref at this time.
In cases where the pointer argument is a vector of pointers, each index must be a vector with the same number of elements.
TableGen Language Reference — LLVM 8 documentation
A trivial example of valid prologue data for the x86 architecture is i8which encodes the nop instruction:. A type construct in a concrete language can be represented by combining these basic types in LLVM. To maintain the semantics of ordinary function calls, the prologue data must have a particular format. If you are unsure if this document is really what you are looking for, please read the introduction to TableGen first. For instance, functions that had an inline definition, but the compiler decided not to inline it.
If unspecified, flags are assumed to hold the conservative false value of 0. Thus, typically we have:.
The remaining two arguments must be integer or pointer or integer vector typed. If lngref 0 is rthen operand 1 may be one of r or m. Notably, this is not a specification from the frontend of what alignment the code generator should use.
All alignments must be a power of 2. The existence of the! The default specifications are given in this list:.
LLVM Language Reference Manual — LLVM 8 documentation
This intrinsic indicates that before this point in the code, the llvmm of the memory pointed to by ptr is dead. If callees metadata is attached to a call site, and any callee is not among the set of functions provided by the metadata, the behavior is undefined. 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.
It expresses the possible ranges the loaded value or the value returned by the called function at this call site is in. This instruction is used in languages with destructors to ensure that proper cleanup is performed in the case of either a longjmp or a thrown exception.
The Objective-C garbage collection module flags metadata consists of the following key-value pairs: If the call to this intrinsic has an alignment value that is not 0 or 1, then the caller guarantees that both the source and destination pointers are aligned to that boundary.
Non-integral pointer types represent pointers that have an alngref bitwise representation; that is, the integral representation ,lvm be target dependent or unstable not backed by a fixed integer. The bit size of the value must be smaller than the bit size of the destination type, ty2. Currently there is an exception for metadata attachment to globals for! When loading a value of a type like i20 with a size that is not an integral number of bytes, the result is undefined if the value was lllvm originally written using a store of the same type.
The in bounds addresses for an allocated object are all the addresses that point into the object, plus the address one byte past the end. A access group metadata node must always be empty which can be used to distinguish an access group metadata node from a list of access groups. When an langdef belongs to multiple access groups, it can also point to a list of accesses groups, illustrated by the following example.
Retrieved March 2, Inline asms with side effects not visible in the constraint list must be marked as having side effects. The code generator may select special instructions to save cache bandwidth, such as the MOVNT instruction on x The result of the instruction is a vector whose length is the same as the shuffle mask and whose element type is the langfef as the element type of the first two operands.
At the moment only X86 supports this convention both 32 and 64 bit. Such ranges shall not overlap with any ranges of addresses allocated by mechanisms provided by LLVM. LLVM allows an explicit langrref to be specified for functions. The second pointer which must be either a lngref or a global value address contains the meta-data to be associated with the root.