diff --git a/3party/eigen/.gitlab-ci.yml b/3party/eigen/.gitlab-ci.yml
deleted file mode 100644
index e5a3c00..0000000
--- a/3party/eigen/.gitlab-ci.yml
+++ /dev/null
@@ -1,23 +0,0 @@
-# This file is part of Eigen, a lightweight C++ template library
-# for linear algebra.
-#
-# Copyright (C) 2020 Arm Ltd. and Contributors
-#
-# This Source Code Form is subject to the terms of the Mozilla
-# Public License v. 2.0. If a copy of the MPL was not distributed
-# with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-stages:
-  - buildsmoketests
-  - smoketests
-  - build
-  - test
-
-variables:
-  BUILDDIR: builddir
-  EIGEN_CI_CMAKE_GENEATOR: "Ninja"
-
-include:
-  - "/ci/smoketests.gitlab-ci.yml"
-  - "/ci/build.gitlab-ci.yml"
-  - "/ci/test.gitlab-ci.yml"
diff --git a/3party/eigen/.gitlab/issue_templates/Bug Report.md b/3party/eigen/.gitlab/issue_templates/Bug Report.md
deleted file mode 100644
index 0c49b0f..0000000
--- a/3party/eigen/.gitlab/issue_templates/Bug Report.md	
+++ /dev/null
@@ -1,69 +0,0 @@
-<!--
-Please read this!
-
-Before opening a new issue, make sure to search for keywords in the issues
-filtered by "bug::confirmed" or "bug::unconfirmed" and "bugzilla" label:
-
-- https://gitlab.com/libeigen/eigen/-/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=bug%3A%3Aconfirmed
-- https://gitlab.com/libeigen/eigen/-/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=bug%3A%3Aunconfirmed
-- https://gitlab.com/libeigen/eigen/-/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=bugzilla
-
-and verify the issue you're about to submit isn't a duplicate. -->
-
-### Summary
-<!-- Summarize the bug encountered concisely. -->
-
-### Environment
-<!-- Please provide your development environment here -->
-- **Operating System** : Windows/Linux
-- **Architecture** : x64/Arm64/PowerPC ...
-- **Eigen Version** : 3.3.9
-- **Compiler Version** : Gcc7.0
-- **Compile Flags** : -O3 -march=native
-- **Vector Extension** : SSE/AVX/NEON ...
-
-### Minimal Example
-<!-- If possible, please create a minimal example here that exhibits the problematic behavior.
-You can also link to [godbolt](https://godbolt.org). But please note that you need to click 
-the "Share" button in the top right-hand corner of the godbolt page where you reproduce the sample 
-code to get the share link instead of in your browser address bar. 
-
-You can read [the guidelines on stackoverflow](https://stackoverflow.com/help/minimal-reproducible-example)
-on how to create a good minimal example. -->
-
-```cpp
-//show your code here
-```
-
-### Steps to reproduce
-<!-- Describe how one can reproduce the issue - this is very important. Please use an ordered list. -->
-
-1. first step
-2. second step
-3. ... 
-
-### What is the current *bug* behavior?
-<!-- Describe what actually happens. -->
-
-### What is the expected *correct* behavior?
-<!-- Describe what you should see instead. -->
-
-### Relevant logs
-<!-- Add relevant code snippets or program output within blocks marked by " ``` " -->
-
-<!-- OPTIONAL: remove this section if you are not reporting a compilation warning issue.-->
-### Warning Messages
-<!-- Show us the warning messages you got! -->
-
-<!-- OPTIONAL: remove this section if you are not reporting a performance issue. -->
-### Benchmark scripts and results
-<!-- Please share any benchmark scripts - either standalone, or using [Google Benchmark](https://github.com/google/benchmark). -->
-
-### Anything else that might help
-<!-- It will be better to provide us more information to help narrow down the cause. 
-Including but not limited to the following: 
-- lines of code that might help us diagnose the problem. 
-- potential ways to address the issue.
-- last known working/first broken version (release number or commit hash). --> 
-
-- [ ] Have a plan to fix this issue.
diff --git a/3party/eigen/.gitlab/issue_templates/Feature Request.md b/3party/eigen/.gitlab/issue_templates/Feature Request.md
deleted file mode 100644
index 2c6f908..0000000
--- a/3party/eigen/.gitlab/issue_templates/Feature Request.md	
+++ /dev/null
@@ -1,7 +0,0 @@
-### Describe the feature you would like to be implemented.
-
-### Would such a feature be useful for other users? Why?
-
-### Any hints on how to implement the requested feature?
-
-### Additional resources
diff --git a/3party/eigen/.gitlab/merge_request_templates/Merge Request Template.md b/3party/eigen/.gitlab/merge_request_templates/Merge Request Template.md
deleted file mode 100644
index 3fe963a..0000000
--- a/3party/eigen/.gitlab/merge_request_templates/Merge Request Template.md	
+++ /dev/null
@@ -1,26 +0,0 @@
-<!-- 
-Thanks for contributing a merge request! Please name and fully describe your MR as you would for a commit message.
-If the MR fixes an issue, please include "Fixes #issue" in the commit message and the MR description.
-
-In addition, we recommend that first-time contributors read our [contribution guidelines](https://eigen.tuxfamily.org/index.php?title=Contributing_to_Eigen) and [git page](https://eigen.tuxfamily.org/index.php?title=Git), which will help you submit a more standardized MR.
-
-Before submitting the MR, you also need to complete the following checks:
-- Make one PR per feature/bugfix (don't mix multiple changes into one PR). Avoid committing unrelated changes.
-- Rebase before committing
-- For code changes, run the test suite (at least the tests that are likely affected by the change).
-  See our [test guidelines](https://eigen.tuxfamily.org/index.php?title=Tests).
-- If possible, add a test (both for bug-fixes as well as new features)
-- Make sure new features are documented
-
-Note that we are a team of volunteers; we appreciate your patience during the review process.
-
-Again, thanks for contributing! -->
-
-### Reference issue
-<!-- You can link to a specific issue using the gitlab syntax #<issue number>  -->
-
-### What does this implement/fix?
-<!--Please explain your changes.-->
-
-### Additional information
-<!--Any additional information you think is important.-->
diff --git a/3party/eigen/.hgeol b/3party/eigen/.hgeol
deleted file mode 100644
index 5327df1..0000000
--- a/3party/eigen/.hgeol
+++ /dev/null
@@ -1,11 +0,0 @@
-[patterns]
-*.sh = LF
-*.MINPACK = CRLF
-scripts/*.in = LF
-debug/msvc/*.dat = CRLF
-debug/msvc/*.natvis = CRLF
-unsupported/test/mpreal/*.* = CRLF
-** = native
-
-[repository]
-native = LF
diff --git a/include/sled/byte_order.h b/include/sled/byte_order.h
index 6251ff7..db34ead 100644
--- a/include/sled/byte_order.h
+++ b/include/sled/byte_order.h
@@ -26,6 +26,25 @@
 #define __BIG_ENDIAN BIG_ENDIAN
 #define __LITTLE_ENDIAN LITTLE_ENDIAN
 #define __PDP_ENDIAN PDP_ENDIAN
+#elif defined(__EMSCRIPTEN__)
+#define htobe16(x) __builtin_bswap16(x)
+#define htole16(x) (x)
+#define be16toh(x) __builtin_bswap16(x)
+#define le16toh(x) (x)
+
+#define htobe32(x) __builtin_bswap32(x)
+#define htole32(x) (x)
+#define be32toh(x) __builtin_bswap32(x)
+#define le32toh(x) (x)
+
+#define htobe64(x) __builtin_bswap64(x)
+#define htole64(x) (x)
+#define be64toh(x) __builtin_bswap64(x)
+#define le64toh(x) (x)
+// #define __BYTE_ORDER __BYTE_ORDER__
+// #define __BIG_ENDIAN __ORDER_BIG_ENDIAN__
+// #define __LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__
+// #define __PDP_ENDIAN __ORDER_PDP_ENDIAN__
 #endif
 
 inline uint16_t
@@ -52,4 +71,4 @@ NetworkToHost32(uint32_t n)
     return be32toh(n);
 }
 
-#endif // SLED_BYTE_ORDER_H
+#endif// SLED_BYTE_ORDER_H