diff --git a/src/libcretonne/cfg.rs b/src/libcretonne/cfg.rs
index c018ab4671..970af69afd 100644
--- a/src/libcretonne/cfg.rs
+++ b/src/libcretonne/cfg.rs
@@ -22,9 +22,9 @@
 //! Here Ebb1 and Ebb2 would each have a single predecessor denoted as (Ebb0, `brz vx, Ebb1`)
 //! and (Ebb0, `jmp Ebb2`) respectively.
 
-use repr::Function;
-use repr::entities::{Inst, Ebb};
-use repr::instructions::InstructionData;
+use ir::Function;
+use ir::entities::{Inst, Ebb};
+use ir::instructions::InstructionData;
 use entity_map::EntityMap;
 
 /// A basic block denoted by its enclosing Ebb and last instruction.
@@ -158,7 +158,7 @@ impl<'a> Iterator for CFGPredecessorsIter<'a> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use repr::Function;
+    use ir::Function;
 
     use test_utils::make_inst;
 
diff --git a/src/libcretonne/repr/condcodes.rs b/src/libcretonne/ir/condcodes.rs
similarity index 100%
rename from src/libcretonne/repr/condcodes.rs
rename to src/libcretonne/ir/condcodes.rs
diff --git a/src/libcretonne/repr/dfg.rs b/src/libcretonne/ir/dfg.rs
similarity index 97%
rename from src/libcretonne/repr/dfg.rs
rename to src/libcretonne/ir/dfg.rs
index 29a462f73e..d377813544 100644
--- a/src/libcretonne/repr/dfg.rs
+++ b/src/libcretonne/ir/dfg.rs
@@ -1,9 +1,9 @@
 //! Data flow graph tracking Instructions, Values, and EBBs.
 
 use entity_map::EntityMap;
-use repr::entities::{Ebb, Inst, Value, NO_VALUE, ExpandedValue};
-use repr::instructions::InstructionData;
-use repr::types::Type;
+use ir::entities::{Ebb, Inst, Value, NO_VALUE, ExpandedValue};
+use ir::instructions::InstructionData;
+use ir::types::Type;
 use std::ops::{Index, IndexMut};
 use std::u16;
 
@@ -57,7 +57,7 @@ impl DataFlowGraph {
 
     /// Get the type of a value.
     pub fn value_type(&self, v: Value) -> Type {
-        use repr::entities::ExpandedValue::*;
+        use ir::entities::ExpandedValue::*;
         match v.expand() {
             Direct(i) => self.insts[i].first_type(),
             Table(i) => {
@@ -75,7 +75,7 @@ impl DataFlowGraph {
     /// This is either the instruction that defined it or the Ebb that has the value as an
     /// argument.
     pub fn value_def(&self, v: Value) -> ValueDef {
-        use repr::entities::ExpandedValue::*;
+        use ir::entities::ExpandedValue::*;
         match v.expand() {
             Direct(inst) => ValueDef::Res(inst, 0),
             Table(idx) => {
@@ -339,8 +339,8 @@ impl EbbData {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use repr::types;
-    use repr::instructions::{Opcode, InstructionData};
+    use ir::types;
+    use ir::instructions::{Opcode, InstructionData};
 
     #[test]
     fn make_inst() {
diff --git a/src/libcretonne/repr/entities.rs b/src/libcretonne/ir/entities.rs
similarity index 100%
rename from src/libcretonne/repr/entities.rs
rename to src/libcretonne/ir/entities.rs
diff --git a/src/libcretonne/repr/immediates.rs b/src/libcretonne/ir/immediates.rs
similarity index 100%
rename from src/libcretonne/repr/immediates.rs
rename to src/libcretonne/ir/immediates.rs
diff --git a/src/libcretonne/repr/instructions.rs b/src/libcretonne/ir/instructions.rs
similarity index 99%
rename from src/libcretonne/repr/instructions.rs
rename to src/libcretonne/ir/instructions.rs
index 7ebb71bbf4..a6c7bd03f1 100644
--- a/src/libcretonne/repr/instructions.rs
+++ b/src/libcretonne/ir/instructions.rs
@@ -10,10 +10,10 @@ use std::fmt::{self, Display, Formatter};
 use std::str::FromStr;
 use std::ops::{Deref, DerefMut};
 
-use repr::entities::*;
-use repr::immediates::*;
-use repr::condcodes::*;
-use repr::types::{self, Type};
+use ir::entities::*;
+use ir::immediates::*;
+use ir::condcodes::*;
+use ir::types::{self, Type};
 
 // Include code generated by `meta/gen_instr.py`. This file contains:
 //
@@ -560,7 +560,7 @@ mod tests {
 
     #[test]
     fn value_set() {
-        use repr::types::*;
+        use ir::types::*;
 
         let vts = ValueTypeSet {
             allow_scalars: true,
diff --git a/src/libcretonne/repr/layout.rs b/src/libcretonne/ir/layout.rs
similarity index 99%
rename from src/libcretonne/repr/layout.rs
rename to src/libcretonne/ir/layout.rs
index 36ee2dacf8..a01d49ef53 100644
--- a/src/libcretonne/repr/layout.rs
+++ b/src/libcretonne/ir/layout.rs
@@ -5,7 +5,7 @@
 
 use std::iter::{Iterator, IntoIterator};
 use entity_map::{EntityMap, EntityRef};
-use repr::entities::{Ebb, NO_EBB, Inst, NO_INST};
+use ir::entities::{Ebb, NO_EBB, Inst, NO_INST};
 
 /// The `Layout` struct determines the layout of EBBs and instructions in a function. It does not
 /// contain definitions of instructions or EBBs, but depends on `Inst` and `Ebb` entity references
@@ -242,7 +242,7 @@ impl<'a> Iterator for Insts<'a> {
 mod tests {
     use super::Layout;
     use entity_map::EntityRef;
-    use repr::entities::{Ebb, Inst};
+    use ir::entities::{Ebb, Inst};
 
     #[test]
     fn append_ebb() {
diff --git a/src/libcretonne/repr/mod.rs b/src/libcretonne/ir/mod.rs
similarity index 96%
rename from src/libcretonne/repr/mod.rs
rename to src/libcretonne/ir/mod.rs
index a62527ccbe..fb93e9ec99 100644
--- a/src/libcretonne/repr/mod.rs
+++ b/src/libcretonne/ir/mod.rs
@@ -8,11 +8,11 @@ pub mod instructions;
 pub mod dfg;
 pub mod layout;
 
-use repr::types::{FunctionName, Signature};
+use ir::types::{FunctionName, Signature};
 use entity_map::EntityRef;
-use repr::entities::{Ebb, NO_EBB, StackSlot};
-use repr::dfg::DataFlowGraph;
-use repr::layout::Layout;
+use ir::entities::{Ebb, NO_EBB, StackSlot};
+use ir::dfg::DataFlowGraph;
+use ir::layout::Layout;
 use std::fmt::{self, Debug, Display, Formatter};
 use std::ops::Index;
 
diff --git a/src/libcretonne/repr/types.rs b/src/libcretonne/ir/types.rs
similarity index 100%
rename from src/libcretonne/repr/types.rs
rename to src/libcretonne/ir/types.rs
diff --git a/src/libcretonne/lib.rs b/src/libcretonne/lib.rs
index 0b1ac8678e..f81bfb5720 100644
--- a/src/libcretonne/lib.rs
+++ b/src/libcretonne/lib.rs
@@ -7,7 +7,7 @@
 
 pub const VERSION: &'static str = env!("CARGO_PKG_VERSION");
 
-pub mod repr;
+pub mod ir;
 pub mod write;
 pub mod cfg;
 
diff --git a/src/libcretonne/test_utils/make_inst.rs b/src/libcretonne/test_utils/make_inst.rs
index 00955a5be5..adc45cdb67 100644
--- a/src/libcretonne/test_utils/make_inst.rs
+++ b/src/libcretonne/test_utils/make_inst.rs
@@ -1,9 +1,9 @@
 //! Helper functions for generating dummy instructions.
 
-use repr::Function;
-use repr::entities::{Ebb, Inst, NO_VALUE};
-use repr::instructions::{InstructionData, Opcode, VariableArgs, JumpData, BranchData};
-use repr::types;
+use ir::Function;
+use ir::entities::{Ebb, Inst, NO_VALUE};
+use ir::instructions::{InstructionData, Opcode, VariableArgs, JumpData, BranchData};
+use ir::types;
 
 pub fn jump(func: &mut Function, dest: Ebb) -> Inst {
     func.dfg.make_inst(InstructionData::Jump {
diff --git a/src/libcretonne/write.rs b/src/libcretonne/write.rs
index 5b66b81065..b42fdf02fd 100644
--- a/src/libcretonne/write.rs
+++ b/src/libcretonne/write.rs
@@ -5,9 +5,9 @@
 //! `cretonne-reader` crate.
 
 use std::io::{self, Write};
-use repr::Function;
-use repr::entities::{Inst, Ebb, Value};
-use repr::types::Type;
+use ir::Function;
+use ir::entities::{Inst, Ebb, Value};
+use ir::types::Type;
 
 pub type Result = io::Result<()>;
 
@@ -182,7 +182,7 @@ pub fn write_instruction(w: &mut Write, func: &Function, inst: Inst) -> Result {
     }
 
     // Then the operands, depending on format.
-    use repr::instructions::InstructionData::*;
+    use ir::instructions::InstructionData::*;
     match func.dfg[inst] {
         Nullary { .. } => writeln!(w, ""),
         Unary { arg, .. } => writeln!(w, " {}", arg),
@@ -217,8 +217,8 @@ pub fn write_instruction(w: &mut Write, func: &Function, inst: Inst) -> Result {
 mod tests {
     use super::*;
     use super::{needs_quotes, escaped};
-    use repr::{Function, StackSlotData};
-    use repr::types;
+    use ir::{Function, StackSlotData};
+    use ir::types;
 
     #[test]
     fn quoting() {
diff --git a/src/libreader/lexer.rs b/src/libreader/lexer.rs
index 87c7482589..3803260c05 100644
--- a/src/libreader/lexer.rs
+++ b/src/libreader/lexer.rs
@@ -6,8 +6,8 @@
 // ====--------------------------------------------------------------------------------------====//
 
 use std::str::CharIndices;
-use cretonne::repr::types;
-use cretonne::repr::entities::{Value, Ebb};
+use cretonne::ir::types;
+use cretonne::ir::entities::{Value, Ebb};
 
 /// The location of a `Token` or `Error`.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
@@ -373,8 +373,8 @@ impl<'a> Lexer<'a> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use cretonne::repr::types;
-    use cretonne::repr::entities::{Value, Ebb};
+    use cretonne::ir::types;
+    use cretonne::ir::entities::{Value, Ebb};
 
     fn token<'a>(token: Token<'a>, line: usize) -> Option<Result<LocatedToken<'a>, LocatedError>> {
         Some(super::token(token, Location { line_number: line }))
diff --git a/src/libreader/parser.rs b/src/libreader/parser.rs
index 0c573558c7..e333c0d3e9 100644
--- a/src/libreader/parser.rs
+++ b/src/libreader/parser.rs
@@ -11,12 +11,12 @@ use std::fmt::{self, Display, Formatter};
 use std::str::FromStr;
 use std::u32;
 use lexer::{self, Lexer, Token};
-use cretonne::repr::types::{Type, VOID, FunctionName, Signature, ArgumentType, ArgumentExtension};
-use cretonne::repr::immediates::{Imm64, Ieee32, Ieee64};
-use cretonne::repr::entities::*;
-use cretonne::repr::instructions::{Opcode, InstructionFormat, InstructionData, VariableArgs,
+use cretonne::ir::types::{Type, VOID, FunctionName, Signature, ArgumentType, ArgumentExtension};
+use cretonne::ir::immediates::{Imm64, Ieee32, Ieee64};
+use cretonne::ir::entities::*;
+use cretonne::ir::instructions::{Opcode, InstructionFormat, InstructionData, VariableArgs,
                                    JumpData, BranchData, ReturnData};
-use cretonne::repr::{Function, StackSlotData};
+use cretonne::ir::{Function, StackSlotData};
 
 pub use lexer::Location;
 
@@ -1039,7 +1039,7 @@ impl<'a> Parser<'a> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use cretonne::repr::types::{self, ArgumentType, ArgumentExtension};
+    use cretonne::ir::types::{self, ArgumentType, ArgumentExtension};
 
     #[test]
     fn argument_type() {
diff --git a/src/tools/print_cfg.rs b/src/tools/print_cfg.rs
index dfa0113fee..9a08c0287e 100644
--- a/src/tools/print_cfg.rs
+++ b/src/tools/print_cfg.rs
@@ -6,9 +6,9 @@ use std::fs::File;
 use std::io::{Read, Write, stdout};
 
 use CommandResult;
-use cretonne::repr::Function;
+use cretonne::ir::Function;
 use cretonne::cfg::ControlFlowGraph;
-use cretonne::repr::instructions::InstructionData;
+use cretonne::ir::instructions::InstructionData;
 use cton_reader::parser::Parser;
 
 pub fn run(files: Vec<String>) -> CommandResult {