createICmp

ICmpInst.Predicate

FCMP_FALSE

FCMP_OEQ

FCMP_OGT

FCMP_OGE

FCMP_OLT

FCMP_OLE

FCMP_ONE

FCMP_ORD

FCMP_UNO

FCMP_UEQ

FCMP_UGT

FCMP_UGE

FCMP_ULT

FCMP_ULE

FCMP_UNE

FCMP_TRUE

FIRST_FCMP_PREDICATE

LAST_FCMP_PREDICATE

BAD_FCMP_PREDICATE

ICMP_EQ

ICMP_NE

ICMP_UGT

ICMP_UGE

ICMP_ULT

ICMP_ULE

ICMP_SGT

ICMP_SGE

ICMP_SLT

ICMP_SLE

FIRST_ICMP_PREDICATE

LAST_ICMP_PREDICATE

BAD_ICMP_PREDICATE

the IRBuilder that manages the creation of the instructions

builder

the comparison operator. One of the elements of
 ICmpInst.Predicate or the corresponding global variables in the R package.

the value objects for the two operands

lhs,rhs

an optional name for the instruction.

This function allows us to create an 
 instruction that compares two integers.
 The usual comparisons such as
 less than, greater than, equal, not equal,
 are supported. And there is support for
 both unsigned and signed versions of all of these comparisons.

programming

This package is currently an interface to some of the
functionality in the llvm toolkit for programmaticall constructing native code.
This allows us to build "compilers" in R and use llvm's optmization and JIT techniques
to improve the code we generate and then turn it into machine code.
This is currently not a compiler. There are examples that illustrate how
to generate code to create native functions that are equivalent to
some simple R functions. The goal is to build on this and create a compiler,
hopefully building on the framework that Luke Tierney has created in his
compiler package (see http://www.cs.uiowa.edu/~luke/R/compiler/).
This is in the RLLVCompile package.
The speed up we achieve compiling R code in our examples illustrate that
we can significantly outperform the R interpreter and also
can outperform some of R's vectorized code by rearranging the computations,
e.g. fusing loops, avoiding memory usage.

createICmp: Create an integer comparison instruction

Description

Usage

Arguments

References