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Assembly writer vs compiler in VLIW architecture

Conversion from assembly program to low-level machine languageWhat do I need to study in order to understand and design a programming language?What defines a tool as a “compiler”is the problem of parallelising any program, NP-complete?What's the advantage of typed assembly?Implementing a Compiler with MacrosThe difference between compiler and interpreterIs it possible to tell if two sequences of assembly instructions are semantically equivalent?High Level Assemblers vs Compilers?Do “compiler” and “assembler” correspond to frontend and backend phases of a compiler?

7

1

$begingroup$

I read this sentence in a book:

In VLIW architecture, the compiler/and or assembly writer chooses instructions that can be executed in parallel.

What is the difference between assembly writer and compiler? Would an assembly writer also mean the same as assembler?

compilers assembly

share|cite|improve this question

edited 38 mins ago

Discrete lizard♦

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asked yesterday

Dasha ShamDasha Sham

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New contributor

Dasha Sham is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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$endgroup$

add a comment | 

7

1

$begingroup$

I read this sentence in a book:

In VLIW architecture, the compiler/and or assembly writer chooses instructions that can be executed in parallel.

What is the difference between assembly writer and compiler? Would an assembly writer also mean the same as assembler?

compilers assembly

share|cite|improve this question

edited 38 mins ago

Discrete lizard♦

5,09811642

asked yesterday

Dasha ShamDasha Sham

363

New contributor

Dasha Sham is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

add a comment | 

$begingroup$

I read this sentence in a book:

In VLIW architecture, the compiler/and or assembly writer chooses instructions that can be executed in parallel.

What is the difference between assembly writer and compiler? Would an assembly writer also mean the same as assembler?

compilers assembly

share|cite|improve this question

edited 38 mins ago

Discrete lizard♦

5,09811642

asked yesterday

Dasha ShamDasha Sham

363

New contributor

Dasha Sham is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$endgroup$

share|cite|improve this question

edited 38 mins ago

Discrete lizard♦

5,09811642

asked yesterday

Dasha ShamDasha Sham

363

New contributor

Dasha Sham is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|cite|improve this question

edited 38 mins ago

Discrete lizard♦

5,09811642

asked yesterday

Dasha ShamDasha Sham

363

New contributor

Dasha Sham is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 38 mins ago

Discrete lizard♦

5,09811642

edited 38 mins ago

Discrete lizard♦

5,09811642

asked yesterday

Dasha ShamDasha Sham

363

New contributor

Dasha Sham is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked yesterday

Dasha ShamDasha Sham

363

2 Answers
2

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25

$begingroup$

The "assembly writer" in that book is a human software developer who writes code in assembler language.

share|cite|improve this answer

answered 23 hours ago

gnasher729gnasher729

12.8k1523

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  It doesn't mean a tool flow which converts to assembly language? Is compiler the only one that does it? (apart from interpreter).
  $endgroup$
  – Dasha Sham
  23 hours ago
  

  
  
  
  


• 
  
  
  

  
  12
  

  
  
  
  
  
  

  
  $begingroup$
  1. interpreter doesn't convert anything to assembly language. 2. Any tool that converts source code to assembly language is by definition a compiler.
  $endgroup$
  – gnasher729
  22 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @gnasher729 by your definition, wouldn't an assembler (the tool, not a person) also be a compiler?
  $endgroup$
  – Kelly S. French
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  @KellyS.French an assembler converts assembly language code to machine code, so with this definition it isn't a compiler. If, however, you have a tool that converts one assembly language into another (e.g. ARBfp1.0 to native assembly language of a modern GPU), this tool is a compiler (with this definition).
  $endgroup$
  – Ruslan
  10 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @gnasher729 - nitpick: by most definitions, the "Assembly language" part of (2) is unnecessary (notably, things like the typescript compiler or the java compiler, neither of which compile the source to assembly, but compile to javascript or java bytecode respectively). More recently it generally means any tool which compiles one programming language into another programming language (and assembly is technically a programming language).
  $endgroup$
  – Delioth
  8 hours ago
  

  
  
  
  

add a comment | 

7

$begingroup$

In VLIW architecture, the compiler/and or assembly writer chooses instructions that can be executed in parallel

The meaning of this sentence is that in VLIW architecture, assembler (machine) code defines which instruction will be executed in parallel, so it's fixed at the time assembly code is written by a human or generated by a compiler.

This differs from super-scalar cpus, where instructions may be executed in parallel, this is a decision made by CPU each time it executes the instructions.

There are also CPUs that combine both approaches - Itanium2 is backward-compatible with Itanium, packing 3 instructions into VLIW word. But, afair, Itanium2 can execute two such packs in the single CPU cycle, and this decision is made at execution time.

share|cite|improve this answer

answered 22 hours ago

BulatBulat

1,201612

$endgroup$

add a comment | 

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25

$begingroup$

The "assembly writer" in that book is a human software developer who writes code in assembler language.

share|cite|improve this answer

answered 23 hours ago

gnasher729gnasher729

12.8k1523

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  It doesn't mean a tool flow which converts to assembly language? Is compiler the only one that does it? (apart from interpreter).
  $endgroup$
  – Dasha Sham
  23 hours ago
  

  
  
  
  


• 
  
  
  

  
  12
  

  
  
  
  
  
  

  
  $begingroup$
  1. interpreter doesn't convert anything to assembly language. 2. Any tool that converts source code to assembly language is by definition a compiler.
  $endgroup$
  – gnasher729
  22 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @gnasher729 by your definition, wouldn't an assembler (the tool, not a person) also be a compiler?
  $endgroup$
  – Kelly S. French
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  @KellyS.French an assembler converts assembly language code to machine code, so with this definition it isn't a compiler. If, however, you have a tool that converts one assembly language into another (e.g. ARBfp1.0 to native assembly language of a modern GPU), this tool is a compiler (with this definition).
  $endgroup$
  – Ruslan
  10 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @gnasher729 - nitpick: by most definitions, the "Assembly language" part of (2) is unnecessary (notably, things like the typescript compiler or the java compiler, neither of which compile the source to assembly, but compile to javascript or java bytecode respectively). More recently it generally means any tool which compiles one programming language into another programming language (and assembly is technically a programming language).
  $endgroup$
  – Delioth
  8 hours ago
  

  
  
  
  

add a comment | 

25

$begingroup$

The "assembly writer" in that book is a human software developer who writes code in assembler language.

share|cite|improve this answer

answered 23 hours ago

gnasher729gnasher729

12.8k1523

$endgroup$

• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  It doesn't mean a tool flow which converts to assembly language? Is compiler the only one that does it? (apart from interpreter).
  $endgroup$
  – Dasha Sham
  23 hours ago
  

  
  
  
  


• 
  
  
  

  
  12
  

  
  
  
  
  
  

  
  $begingroup$
  1. interpreter doesn't convert anything to assembly language. 2. Any tool that converts source code to assembly language is by definition a compiler.
  $endgroup$
  – gnasher729
  22 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  $begingroup$
  @gnasher729 by your definition, wouldn't an assembler (the tool, not a person) also be a compiler?
  $endgroup$
  – Kelly S. French
  10 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  @KellyS.French an assembler converts assembly language code to machine code, so with this definition it isn't a compiler. If, however, you have a tool that converts one assembly language into another (e.g. ARBfp1.0 to native assembly language of a modern GPU), this tool is a compiler (with this definition).
  $endgroup$
  – Ruslan
  10 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  @gnasher729 - nitpick: by most definitions, the "Assembly language" part of (2) is unnecessary (notably, things like the typescript compiler or the java compiler, neither of which compile the source to assembly, but compile to javascript or java bytecode respectively). More recently it generally means any tool which compiles one programming language into another programming language (and assembly is technically a programming language).
  $endgroup$
  – Delioth
  8 hours ago
  

  
  
  
  

add a comment | 

$begingroup$

The "assembly writer" in that book is a human software developer who writes code in assembler language.

share|cite|improve this answer

answered 23 hours ago

gnasher729gnasher729

12.8k1523

$endgroup$

share|cite|improve this answer

answered 23 hours ago

gnasher729gnasher729

12.8k1523

answered 23 hours ago

gnasher729gnasher729

12.8k1523

answered 23 hours ago

gnasher729gnasher729

12.8k1523

7

$begingroup$

In VLIW architecture, the compiler/and or assembly writer chooses instructions that can be executed in parallel

The meaning of this sentence is that in VLIW architecture, assembler (machine) code defines which instruction will be executed in parallel, so it's fixed at the time assembly code is written by a human or generated by a compiler.

This differs from super-scalar cpus, where instructions may be executed in parallel, this is a decision made by CPU each time it executes the instructions.

There are also CPUs that combine both approaches - Itanium2 is backward-compatible with Itanium, packing 3 instructions into VLIW word. But, afair, Itanium2 can execute two such packs in the single CPU cycle, and this decision is made at execution time.

share|cite|improve this answer

answered 22 hours ago

BulatBulat

1,201612

$endgroup$

add a comment | 

7

$begingroup$

In VLIW architecture, the compiler/and or assembly writer chooses instructions that can be executed in parallel

The meaning of this sentence is that in VLIW architecture, assembler (machine) code defines which instruction will be executed in parallel, so it's fixed at the time assembly code is written by a human or generated by a compiler.

This differs from super-scalar cpus, where instructions may be executed in parallel, this is a decision made by CPU each time it executes the instructions.

There are also CPUs that combine both approaches - Itanium2 is backward-compatible with Itanium, packing 3 instructions into VLIW word. But, afair, Itanium2 can execute two such packs in the single CPU cycle, and this decision is made at execution time.

share|cite|improve this answer

answered 22 hours ago

BulatBulat

1,201612

$endgroup$

add a comment | 

$begingroup$

In VLIW architecture, the compiler/and or assembly writer chooses instructions that can be executed in parallel

The meaning of this sentence is that in VLIW architecture, assembler (machine) code defines which instruction will be executed in parallel, so it's fixed at the time assembly code is written by a human or generated by a compiler.

This differs from super-scalar cpus, where instructions may be executed in parallel, this is a decision made by CPU each time it executes the instructions.

There are also CPUs that combine both approaches - Itanium2 is backward-compatible with Itanium, packing 3 instructions into VLIW word. But, afair, Itanium2 can execute two such packs in the single CPU cycle, and this decision is made at execution time.

share|cite|improve this answer

answered 22 hours ago

BulatBulat

1,201612

$endgroup$

share|cite|improve this answer

answered 22 hours ago

BulatBulat

1,201612

answered 22 hours ago

BulatBulat

1,201612

answered 22 hours ago

BulatBulat

1,201612