docs/DESIGN.rst - Issue 1562543002: move .rst to docs

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Issue 1562543002: move .rst to docs (Closed) Base URL: https://chromium.googlesource.com/native_client/pnacl-subzero.git@master

Patch Set: changes suggested by stichnot Created 4 years, 11 months ago

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1 Design of the Subzero fast code generator	1 Design of the Subzero fast code generator

2 =========================================	2 =========================================

3	3

4 Introduction	4 Introduction

5 ------------	5 ------------

6	6

7 The `Portable Native Client (PNaCl) <http://gonacl.com>`_ project includes	7 The `Portable Native Client (PNaCl) <http://gonacl.com>`_ project includes

8 compiler technology based on `LLVM <http://llvm.org/>`_. The developer uses the	8 compiler technology based on `LLVM <http://llvm.org/>`_. The developer uses the

9 PNaCl toolchain to compile their application to architecture-neutral PNaCl	9 PNaCl toolchain to compile their application to architecture-neutral PNaCl

10 bitcode (a ``.pexe`` file), using as much architecture-neutral optimization as	10 bitcode (a ``.pexe`` file), using as much architecture-neutral optimization as

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1485 This could be mitigated by switching these to the CFG-local allocator.	1485 This could be mitigated by switching these to the CFG-local allocator.

1486	1486

1487 Third, multithreading may make the default allocator strategy more expensive.	1487 Third, multithreading may make the default allocator strategy more expensive.

1488 In a single-threaded environment, a pass will allocate its containers, run the	1488 In a single-threaded environment, a pass will allocate its containers, run the

1489 pass, and deallocate the containers. This results in stack-like allocation	1489 pass, and deallocate the containers. This results in stack-like allocation

1490 behavior and makes the heap free list easier to manage, with less heap	1490 behavior and makes the heap free list easier to manage, with less heap

1491 fragmentation. But when multithreading is added, the allocations and	1491 fragmentation. But when multithreading is added, the allocations and

1492 deallocations become much less stack-like, making allocation and deallocation	1492 deallocations become much less stack-like, making allocation and deallocation

1493 operations individually more expensive. Again, this could be mitigated by	1493 operations individually more expensive. Again, this could be mitigated by

1494 switching these to the CFG-local allocator.	1494 switching these to the CFG-local allocator.

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