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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<TITLE>The CompCert verified compiler</TITLE>
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<H1 align="center">The CompCert verified compiler</H1>
<H2 align="center">Commented Coq development</H2>
<H3 align="center">Version 3.8, 2020-11-16</H3>
</font>
<H3 align="center">PATCHED for the Kalray MPPA-KVX VLIW CORE<!--@DATE@--></H3>
<H2>Introduction</H2>
<p>This web page is a patched version of the table of contents of the official CompCert sources documentation,
as given on <A HREF="http://compcert.org/doc/index.html">the CompCert Web site</A>.
The unmodified parts of this table appear in <font color=gray>gray</font>.
<br>
<br>
A high-level view of this CompCert backend is provided by this OOPSLA'20 paper (of Six, Boulmé and Monniaux):
<div><a href=https://hal.archives-ouvertes.fr/hal-02185883>Certified and Efficient Instruction Scheduling. Application to Interlocked VLIW Processors.</a></div>
<br>
See also the <tt>README.md</tt> of our <a href=https://gricad-gitlab.univ-grenoble-alpes.fr/certicompil/compcert-kvx>GitLab public repository</a>.
</p>
<font color=gray>
<H2>Table of contents</H2>
<H3>General-purpose libraries, data structures and algorithms</H3>
<UL>
<LI> <A HREF="html/compcert.lib.Coqlib.html">Coqlib</A>: addendum to the Coq standard library.
<LI> <A HREF="html/compcert.lib.Maps.html">Maps</A>: finite maps.
<LI> <A HREF="html/compcert.lib.Integers.html">Integers</A>: machine integers.
<LI> <A HREF="html/compcert.lib.Floats.html">Floats</A>: machine floating-point numbers.
<LI> <A HREF="html/compcert.lib.Iteration.html">Iteration</A>: various forms of "while" loops.
<LI> <A HREF="html/compcert.lib.Ordered.html">Ordered</A>: construction of
ordered types.
<LI> <A HREF="html/compcert.lib.Lattice.html">Lattice</A>: construction of
semi-lattices.
<LI> <A HREF="html/compcert.backend.Kildall.html">Kildall</A>: resolution of dataflow
inequations by fixpoint iteration.
<LI> <A HREF="html/compcert.lib.UnionFind.html">UnionFind</A>: a persistent union-find data structure.
<LI> <A HREF="html/compcert.lib.Postorder.html">Postorder</A>: postorder numbering of a directed graph.
</UL></font>
<H4>The <tt>abstractbb</tt> library, introduced for KVX core</H4>
<UL>
<LI> <A HREF="html/compcert.scheduling.abstractbb.AbstractBasicBlocksDef.html">AbstractBasicBlocksDef</A>: an IR for verifying some semantic properties on basic-blocks.
<LI> <A HREF="html/compcert.scheduling.abstractbb.Parallelizability.html">Parallelizability</A>: verifying that sequential and parallel semantics are equivalent for a given abstract basic-block.
<LI> <A HREF="html/compcert.scheduling.abstractbb.ImpSimuTest.html">ImpSimuTest</A>: verifying that a given abstract basic-block is simulated by another one for sequential semantics. This module refines <A HREF="html/compcert.scheduling.abstractbb.SeqSimuTheory.html">SeqSimuTheory</A> with hash-consing and uses <A HREF=https://github.com/boulme/ImpureDemo>the Impure library</A> to reason on physical equality and handling of imperative code in Coq.
</UL>
<font color=gray>
<H3>Definitions and theorems used in many parts of the development</H3>
<UL>
<LI> <A HREF="html/compcert.common.Errors.html">Errors</A>: the Error monad.
<LI> <A HREF="html/compcert.common.AST.html">AST</A>: identifiers, whole programs and other
common elements of abstract syntaxes.
<LI> <A HREF="html/compcert.common.Linking.html">Linking</A>: generic framework to define syntactic linking over the CompCert languages.
<LI> <A HREF="html/compcert.common.Values.html">Values</A>: run-time values.
<LI> <A HREF="html/compcert.common.Events.html">Events</A>: observable events and traces.
<LI> <A HREF="html/compcert.common.Memory.html">Memory</A>: memory model. <BR>
See also: <A HREF="html/compcert.common.Memdata.html">Memdata</A> (in-memory representation of data).
<LI> <A HREF="html/compcert.common.Globalenvs.html">Globalenvs</A>: global execution environments.
<LI> <A HREF="html/compcert.common.Smallstep.html">Smallstep</A>: tools for small-step semantics.
<LI> <A HREF="html/compcert.common.Behaviors.html">Behaviors</A>: from small-step semantics to observable behaviors of programs.
<LI> <A HREF="html/compcert.common.Determinism.html">Determinism</A>: determinism properties of small-step semantics.
<LI> <A HREF="html/compcert.kvx.Op.html"><I>Op</I></A>: operators, addressing modes and their
semantics.
<LI> <A HREF="html/compcert.common.Builtins.html">Builtins</A>: semantics of built-in functions. <BR>
See also: <A HREF="html/compcert.common.Builtins0.html">Builtins0</A> (target-independent part), <A HREF="html/compcert.kvx.Builtins1.html"><I>Builtins1</I></A> (target-dependent part).
<LI> <A HREF="html/compcert.common.Unityping.html">Unityping</A>: a solver for atomic unification constraints.
</UL>
<H3>Source, intermediate and target languages: syntax and semantics</H3>
<UL>
<LI> The CompCert C source language:
<A HREF="html/compcert.cfrontend.Csyntax.html">syntax</A> and
<A HREF="html/compcert.cfrontend.Csem.html">semantics</A> and
<A HREF="html/compcert.cfrontend.Cstrategy.html">determinized semantics</A> and
<A HREF="html/compcert.cfrontend.Ctyping.html">type system</A>.<BR>
See also: <A HREF="html/compcert.cfrontend.Ctypes.html">type expressions</A> and
<A HREF="html/compcert.cfrontend.Cop.html">operators (syntax and semantics)</A>.<BR>
See also: <A HREF="html/compcert.cfrontend.Cexec.html">reference interpreter</A>.
<LI> <A HREF="html/compcert.cfrontend.Clight.html">Clight</A>: a simpler version of CompCert C where expressions contain no side-effects.
<LI> <A HREF="html/compcert.cfrontend.Csharpminor.html">Csharpminor</A>: low-level
structured language.
<LI> <A HREF="html/compcert.backend.Cminor.html">Cminor</A>: low-level structured
language, with explicit stack allocation of certain local variables.
<LI> <A HREF="html/compcert.backend.CminorSel.html">CminorSel</A>: like Cminor,
with machine-specific operators and addressing modes.
<LI> <A HREF="html/compcert.backend.RTL.html">RTL</A>: register transfer language (3-address
code, control-flow graph, infinitely many pseudo-registers). <BR>
See also: <A HREF="html/compcert.backend.Registers.html">Registers</A> (representation of
pseudo-registers).
<LI> <A HREF="html/compcert.backend.LTL.html">LTL</A>: location transfer language (3-address
code, control-flow graph of basic blocks, finitely many physical registers, infinitely
many stack slots). <BR>
See also: <A HREF="html/compcert.backend.Locations.html">Locations</A> (representation of
locations) and <A HREF="html/compcert.kvx.Machregs.html"><I>Machregs</I></A> (description of processor registers).
<LI> <A HREF="html/compcert.backend.Linear.html">Linear</A>: like LTL, but the CFG is
replaced by a linear list of instructions with explicit branches and labels.
<LI> <A HREF="html/compcert.backend.Mach.html">Mach</A>: like Linear, with a more concrete
view of the activation record.
</UL>
</font>
<H4>Languages introduced for KVX core</H4>
<UL>
<LI> <A HREF="html/compcert.scheduling.RTLpath.html">RTLpath</A>: extends RTL with annotations for delimitating superblocks (with possible liveness information).
This IR is generic over the processor, and used for prepass scheduling.
<LI> <A HREF="html/compcert.scheduling.postpass_lib.Machblock.html">Machblock</A>: a variant of Mach, with a syntax for basic-blocks, and a block-step semantics (execute one basic-block in one step).
This IR is generic over the processor, even if currently, only used for KVX.
<LI> <A HREF="html/compcert.kvx.Asmvliw.html"><I>Asmvliw</I></A>: abstract syntax and semantics for KVX VLIW assembly: atomic instructions are grouped by "bundles". These bundles are executed sequentially, but execution is parallel within bundles.
<LI> <A HREF="html/compcert.kvx.Asmblock.html"><I>Asmblock</I></A>: a variant of Asmvliw, with a sequential semantics within bundles, which make them corresponds here to usual basic-blocks.
This IR is an intermediate step between Machblock and Asmvliw.
<LI> <A HREF="html/compcert.kvx.Asm.html"><I>Asm</I></A>: a variant of Asmvliw with a flat syntax for bundles, instead of a structured one (bundle termination is encoded as a pseudo-instruction). This IR is mainly a wrapper of <I>Asmvliw</I> for a smooth integration in CompCert (and an easier pretty-printing of the abstract syntax).
</UL>
<H3>Compiler passes</H3>
<TABLE cellpadding="5%" style="color:#808080">
<TR valign="top">
<TH align=left>Pass</TH>
<TH align=left>Source & target</TH>
<TH align=left>Compiler code</TH>
<TH align=left>Correctness proof</TH>
</TR>
<TR valign="top">
<TD>Pulling side-effects out of expressions;<br>
fixing an evaluation order</TD>
<TD>CompCert C to Clight</TD>
<TD><A HREF="html/compcert.cfrontend.SimplExpr.html">SimplExpr</A></TD>
<TD><A HREF="html/compcert.cfrontend.SimplExprspec.html">SimplExprspec</A><br>
<A HREF="html/compcert.cfrontend.SimplExprproof.html">SimplExprproof</A></TD>
</TR>
<TR valign="top">
<TD>Pulling non-adressable scalar local variables out of memory</TD>
<TD>Clight to Clight</TD>
<TD><A HREF="html/compcert.cfrontend.SimplLocals.html">SimplLocals</A></TD>
<TD><A HREF="html/compcert.cfrontend.SimplLocalsproof.html">SimplLocalsproof</A></TD>
</TR>
<TR valign="top">
<TD>Simplification of control structures; <br>
explication of type-dependent computations</TD>
<TD>Clight to Csharpminor</TD>
<TD><A HREF="html/compcert.cfrontend.Cshmgen.html">Cshmgen</A></TD>
<TD><A HREF="html/compcert.cfrontend.Cshmgenproof.html">Cshmgenproof</A></TD>
</TR>
<TR valign="top">
<TD>Stack allocation of local variables<br>
whose address is taken;<br>
simplification of switch statements</TD>
<TD>Csharpminor to Cminor</TD>
<TD><A HREF="html/compcert.cfrontend.Cminorgen.html">Cminorgen</A></TD>
<TD><A HREF="html/compcert.cfrontend.Cminorgenproof.html">Cminorgenproof</A></TD>
</TR>
<TR valign="top">
<TD>Recognition of operators<br>and addressing modes;<br>
if-conversion</TD>
<TD>Cminor to CminorSel</TD>
<TD><A HREF="html/compcert.backend.Selection.html">Selection</A><br>
<A HREF="html/compcert.kvx.SelectOp.html"><I>SelectOp</I></A><br>
<A HREF="html/compcert.kvx.SelectLong.html"><I>SelectLong</I></A><br>
<A HREF="html/compcert.backend.SelectDiv.html">SelectDiv</A><br>
<A HREF="html/compcert.backend.SplitLong.html">SplitLong</A></TD>
<TD><A HREF="html/compcert.backend.Selectionproof.html">Selectionproof</A><br>
<A HREF="html/compcert.kvx.SelectOpproof.html"><I>SelectOpproof</I></A><br>
<A HREF="html/compcert.kvx.SelectLongproof.html"><I>SelectLongproof</I></A><br>
<A HREF="html/compcert.backend.SelectDivproof.html">SelectDivproof</A><br>
<A HREF="html/compcert.backend.SplitLongproof.html">SplitLongproof</A></TD>
</TR>
<TR valign="top">
<TD>Construction of the CFG, <br>3-address code generation</TD>
<TD>CminorSel to RTL</TD>
<TD><A HREF="html/compcert.backend.RTLgen.html">RTLgen</A></TD>
<TD><A HREF="html/compcert.backend.RTLgenspec.html">RTLgenspec</A><BR>
<A HREF="html/compcert.backend.RTLgenproof.html">RTLgenproof</A></TD>
</TR>
<TR valign="top">
<TD>Recognition of tail calls</TD>
<TD>RTL to RTL</TD>
<TD><A HREF="html/compcert.backend.Tailcall.html">Tailcall</A></TD>
<TD><A HREF="html/compcert.backend.Tailcallproof.html">Tailcallproof</A></TD>
</TR>
<TR valign="top">
<TD>Function inlining</TD>
<TD>RTL to RTL</TD>
<TD><A HREF="html/compcert.backend.Inlining.html">Inlining</A></TD>
<TD><A HREF="html/compcert.backend.Inliningspec.html">Inliningspec</A><BR>
<A HREF="html/compcert.backend.Inliningproof.html">Inliningproof</A></TD>
</TR>
<TR valign="top">
<TD>Postorder renumbering of the CFG</TD>
<TD>RTL to RTL</TD>
<TD><A HREF="html/compcert.backend.Renumber.html">Renumber</A></TD>
<TD><A HREF="html/compcert.backend.Renumberproof.html">Renumberproof</A></TD>
</TR>
<TR valign="top">
<TD>Common subexpression elimination</TD>
<TD>RTL to RTL</TD>
<TD><A HREF="html/compcert.backend.CSE.html">CSE</A><BR>
<A HREF="html/compcert.kvx.CombineOp.html"><I>CombineOp</I></A></TD>
<TD><A HREF="html/compcert.backend.CSEproof.html">CSEproof</A><BR>
<A HREF="html/compcert.kvx.CombineOpproof.html"><I>CombineOpproof</I></A></TD>
</TR>
<TR valign="top">
<TD>Constant propagation</TD>
<TD>RTL to RTL</TD>
<TD><A HREF="html/compcert.backend.Constprop.html">Constprop</A><br>
<A HREF="html/compcert.kvx.ConstpropOp.html"><I>ConstpropOp</I></A></TD>
<TD><A HREF="html/compcert.backend.Constpropproof.html">Constpropproof</A><br>
<A HREF="html/compcert.kvx.ConstpropOpproof.html"><I>ConstproppOproof</I></A></TD>
</TR>
<TR valign="top">
<TD>Redundancy elimination</TD>
<TD>RTL to RTL</TD>
<TD><A HREF="html/compcert.backend.Deadcode.html">Deadcode</A></TD>
<TD><A HREF="html/compcert.backend.Deadcodeproof.html">Deadcodeproof</A></TD>
</TR>
<TR valign="top">
<TD>Removal of unused static globals</TD>
<TD>RTL to RTL</TD>
<TD><A HREF="html/compcert.backend.Unusedglob.html">Unusedglob</A></TD>
<TD><A HREF="html/compcert.backend.Unusedglobproof.html">Unusedglobproof</A></TD>
</TR>
<TR valign="top" style="color:#000000">
<TD colspan="4"><b>Passes introduced for profiling (for later use in trace selection)</b></TD>
</TR>
<TR valign="top" style="color:#000000">
<TD>Insert profiling annotations (for recording experiments -- see PROFILE.md).
</TD>
<TD>RTL to RTL</TD>
<TD><A HREF="html/compcert.backend.Profiling.html">Profiling</A></TD>
<TD><A HREF="html/compcert.backend.Profilingproof.html">Profilingproof</A></TD>
</TR>
<TR valign="top" style="color:#000000">
<TD>Update ICond nodes (from recorded experiments -- see PROFILE.md).
</TD>
<TD>RTL to RTL</TD>
<TD><A HREF="html/compcert.backend.ProfilingExploit.html">ProfilingExploit</A></TD>
<TD><A HREF="html/compcert.backend.ProfilingExploitproof.html">ProfilingExploitproof</A></TD>
</TR>
<TR valign="top" style="color:#000000">
<TD colspan="4"><b>Passes introduced for superblock prepass scheduling</b></TD>
</TR>
<TR valign="top" style="color:#000000">
<TD>Code duplications (trace selection, loop unrollings, etc)
</TD>
<TD>RTL to RTL</TD>
<TD><A HREF="html/compcert.backend.Duplicate.html">Duplicate</A> (generic checker)</TD>
<TD><A HREF="html/compcert.backend.Duplicateproof.html">Duplicateproof</A> (generic proof)<BR>
<a href="html/compcert.backend.Duplicatepasses.html">Duplicatepasses</a> (several passes from several oracles)</TD>
</TR>
<TR valign="top" style="color:#000000">
<TD>Superblock selection (with Liveness information)</TD>
<TD>RTL to RTLPath</TD>
<TD><A HREF="html/compcert.scheduling.RTLpathLivegen.html">RTLpathLivegen</A></TD>
<TD><A HREF="html/compcert.scheduling.RTLpathLivegenproof.html">RTLpathLivegenproof</A></TD>
</TR>
<TR valign="top" style="color:#000000">
<TD>Superblock prepass scheduling</TD>
<TD>RTLPath to RTLPath</TD>
<TD><A HREF="html/compcert.scheduling.RTLpathScheduler.html">RTLpathScheduler</A></TD>
<TD><A HREF="html/compcert.scheduling.RTLpathSchedulerproof.html">RTLpathSchedulerproof</A><BR>
with <A HREF="html/compcert.scheduling.RTLpathSE_theory.html">RTLpathSE_theory</A> (the theory of symbolic execution on RTLpath)<BR>
and <A HREF="html/compcert.scheduling.RTLpathSE_simu_specs.html">RTLpathSE_simu_specs</A> (the low-level specifications of the simulation checker)<BR>
and <A HREF="html/compcert.scheduling.RTLpathSE_impl.html">RTLpathSE_impl</A> (the simulation checker with hash-consing)</TD>
</TR>
<TR valign="top" style="color:#000000">
<TD>Forgeting superblocks</TD>
<TD>RTLPath to RTL</TD>
<TD><A HREF="html/compcert.scheduling.RTLpath.html#transf_program">RTLpath.transf_program</A></TD>
<TD><A HREF="html/compcert.scheduling.RTLpathproof.html">RTLpathproof</A></TD>
</TR>
<TR valign="top">
<TD colspan="4"><b>Passes from register allocation</b></TD>
</TR>
<TR valign="top">
<TD>Register allocation (validation a posteriori)</TD>
<TD>RTL to LTL</TD>
<TD><A HREF="html/compcert.backend.Allocation.html">Allocation</A></TD>
<TD><A HREF="html/compcert.backend.Allocproof.html">Allocproof</A></TD>
</TR>
<TR valign="top">
<TD>(LTL) Branch tunneling</TD>
<TD>LTL to LTL</TD>
<TD><A HREF="html/compcert.backend.LTLTunneling.html">LTLTunneling</A></TD>
<TD><A HREF="html/compcert.backend.LTLTunnelingproof.html">LTLTunnelingproof</A></TD>
</TR>
<TR valign="top">
<TD>Linearization of the CFG</TD>
<TD>LTL to Linear</TD>
<TD><A HREF="html/compcert.backend.Linearize.html">Linearize</A></TD>
<TD><A HREF="html/compcert.backend.Linearizeproof.html">Linearizeproof</A></TD>
</TR>
<TR valign="top">
<TD>Removal of unreferenced labels</TD>
<TD>Linear to Linear</TD>
<TD><A HREF="html/compcert.backend.CleanupLabels.html">CleanupLabels</A></TD>
<TD><A HREF="html/compcert.backend.CleanupLabelsproof.html">CleanupLabelsproof</A></TD>
</TR>
<TR valign="top">
<TD>Synthesis of debugging information</TD>
<TD>Linear to Linear</TD>
<TD><A HREF="html/compcert.backend.Debugvar.html">Debugvar</A></TD>
<TD><A HREF="html/compcert.backend.Debugvarproof.html">Debugvarproof</A></TD>
</TR>
<TR valign="top">
<TD>Laying out the activation records</TD>
<TD>Linear to Mach</TD>
<TD><A HREF="html/compcert.backend.Stacking.html">Stacking</A><BR>
<A HREF="html/compcert.backend.Bounds.html">Bounds</A><BR>
<A HREF="html/compcert.kvx.Stacklayout.html"><I>Stacklayout</I></A></TD>
<TD><A HREF="html/compcert.backend.Stackingproof.html">Stackingproof</A><br>
<A HREF="html/compcert.common.Separation.html">Separation</A></TD>
</TR>
<TR valign="top" style="color:#000000">
<TD colspan="4"><b>Passes introduced for KVX VLIW</b></TD>
</TR>
<TR valign="top" style="color:#000000">
<TD>Reconstruction of basic-blocks at Mach level</TD>
<TD>Mach to Machblock</TD>
<TD><A HREF="html/compcert.scheduling.postpass_lib.Machblockgen.html">Machblockgen</A></TD>
<TD><A HREF="html/compcert.scheduling.postpass_lib.ForwardSimulationBlock.html">ForwardSimulationBlock</A><BR>
<A HREF="html/compcert.scheduling.postpass_lib.Machblockgenproof.html">Machblockgenproof</A></TD>
</TR>
<TR valign="top" style="color:#000000">
<TD>Emission of purely sequential assembly code</TD>
<TD>Machblock to Asmblock</TD>
<TD><A HREF="html/compcert.kvx.Asmblockgen.html"><I>Asmblockgen</I></A></TD>
<TD><A HREF="html/compcert.kvx.Asmblockgenproof0.html"><I>Asmblockgenproof0</I></A><BR>
<A HREF="html/compcert.kvx.Asmblockgenproof1.html"><I>Asmblockgenproof1</I></A><BR>
<A HREF="html/compcert.kvx.Asmblockgenproof.html"><I>Asmblockgenproof</I></A></TD>
</TR>
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<TD>Bundling (and basic-block scheduling)</TD>
<TD>Asmblock to Asmvliw</TD>
<TD><A HREF="html/compcert.kvx.PostpassScheduling.html"><I>PostpassScheduling</I></A><BR>
using <A HREF="html/compcert.kvx.Asmblockdeps.html"><I>Asmblockdeps</I></A><BR>
and the <tt>abstractbb</tt> library</TD>
<TD><A HREF="html/compcert.kvx.PostpassSchedulingproof.html"><I>PostpassSchedulingproof</I></A></TD>
</TR>
<TR valign="top" style="color:#000000">
<TD>Flattening bundles (only a bureaucratic operation)</TD>
<TD>Asmvliw to Asm</TD>
<TD><A HREF="html/compcert.kvx.Asmgen.html"><I>Asmgen</I></A></TD>
<TD><A HREF="html/compcert.kvx.Asmgenproof.html"><I>Asmgenproof</I></A> (whole simulation proof from <tt>Mach</tt> to <tt>Asm</tt>)</TD>
</TR>
</TABLE>
<H3>All together (there are many more RTL passes than on vanilla CompCert: their order is specified in Compiler)</H3>
<UL>
</font>
<LI> <A HREF="html/compcert.driver.Compiler.html">Compiler</A>: composing the passes together;
whole-compiler semantic preservation theorems.
<font color=gray>
<LI> <A HREF="html/compcert.driver.Complements.html">Complements</A>: interesting consequences of the semantic preservation theorems.
</UL>
<H3>Static analyses</H3>
The following static analyses are performed over the RTL intermediate
representation to support optimizations such as constant propagation,
CSE, and dead code elimination.
<UL>
<LI> <A HREF="html/compcert.backend.Liveness.html">Liveness</A>: liveness analysis</A>.
<LI> <A HREF="html/compcert.backend.ValueAnalysis.html">ValueAnalysis</A>: value and alias analysis</A> <BR>
See also: <A HREF="html/compcert.backend.ValueDomain.html">ValueDomain</A>: the abstract domain for value analysis.<BR>
See also: <A HREF="html/compcert.kvx.ValueAOp.html"><I>ValueAOp</I></A>: processor-dependent parts of value analysis.
<LI> <A HREF="html/compcert.backend.Deadcode.html">Deadcode</A>: neededness analysis</A> <BR>
See also: <A HREF="html/compcert.backend.NeedDomain.html">NeedDomain</A>: the abstract domain for neededness analysis.<BR>
See also: <A HREF="html/compcert.kvx.NeedOp.html"><I>NeedOp</I></A>: processor-dependent parts of neededness analysis.
</UL>
<H3>Type systems</H3>
The <A HREF="html/compcert.cfrontend.Ctyping.html">type system of CompCert C</A> is fully formalized. For some intermediate languages of the back-end, simpler type systems are used to statically capture well-formedness conditions.
<UL>
<LI> <A HREF="html/compcert.cfrontend.Ctyping.html">Ctyping</A>: typing for CompCert C + type-checking functions.
<LI> <A HREF="html/compcert.backend.RTLtyping.html">RTLtyping</A>: typing for RTL + type
reconstruction.
<LI> <A HREF="html/compcert.backend.Lineartyping.html">Lineartyping</A>: typing for Linear.
</UL>
</font>
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