If the indirect strategy is used, after all the virtual registers have been
mapped to physical registers or stack slots, it is necessary to use a spiller
object to place load and store instructions in the code. Every virtual that has
-been mapped to a stack slot will be stored to memory after been defined and will
+been mapped to a stack slot will be stored to memory after being defined and will
be loaded before being used. The implementation of the spiller tries to recycle
load/store instructions, avoiding unnecessary instructions. For an example of
how to invoke the spiller, see ``RegAllocLinearScan::runOnMachineFunction`` in
instructions are three address instructions. That is, each instruction is
expected to define at most one register, and to use at most two registers.
However, some architectures use two address instructions. In this case, the
-defined register is also one of the used register. For instance, an instruction
+defined register is also one of the used registers. For instance, an instruction
such as ``ADD %EAX, %EBX``, in X86 is actually equivalent to ``%EAX = %EAX +
%EBX``.
correspond to. The MCInsts that are generated by this are fed into the
instruction printer or the encoder.
-Finally, at your choosing, you can also implement an subclass of MCCodeEmitter
+Finally, at your choosing, you can also implement a subclass of MCCodeEmitter
which lowers MCInst's into machine code bytes and relocations. This is
important if you want to support direct .o file emission, or would like to
implement an assembler for your target.
The idea behind this convention is to support calls to runtime functions
that have a hot path and a cold path. The hot path is usually a small piece
- of code that doesn't many registers. The cold path might need to call out to
+ of code that doesn't use many registers. The cold path might need to call out to
another function and therefore only needs to preserve the caller-saved
registers, which haven't already been saved by the caller. The
`PreserveMost` calling convention is very similar to the `cold` calling
Global variables define regions of memory allocated at compilation time
instead of run-time.
-Global variables definitions must be initialized.
+Global variable definitions must be initialized.
Global variables in other translation units can also be declared, in which
case they don't have an initializer.
LLVM allows an explicit section to be specified for functions. If the
target supports it, it will emit functions to the section specified.
-Additionally, the function can placed in a COMDAT.
+Additionally, the function can be placed in a COMDAT.
An explicit alignment may be specified for a function. If not present,
or if the alignment is set to zero, the alignment of the function is set
is specified, the function is forced to have at least that much
alignment. All alignments must be a power of 2.
-If the ``unnamed_addr`` attribute is given, the address is know to not
+If the ``unnamed_addr`` attribute is given, the address is known to not
be significant and two identical functions can be merged.
Syntax::
``linkonce_odr``, ``weak_odr``, ``external``. Note that some system linkers
might not correctly handle dropping a weak symbol that is aliased.
-Alias that are not ``unnamed_addr`` are guaranteed to have the same address as
+Aliases that are not ``unnamed_addr`` are guaranteed to have the same address as
the aliasee expression. ``unnamed_addr`` ones are only guaranteed to point
to the same content.
LLVM IR floating-point binary ops (:ref:`fadd <i_fadd>`,
:ref:`fsub <i_fsub>`, :ref:`fmul <i_fmul>`, :ref:`fdiv <i_fdiv>`,
-:ref:`frem <i_frem>`) have the following flags that can set to enable
+:ref:`frem <i_frem>`) have the following flags that can be set to enable
otherwise unsafe floating point operations
``nnan``
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