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# 2.x series change log
This page summarizes the major functional and performance changes in each
release of the 2.x series.
All performance data on this page is measured on an Intel Core i5-9600K
clocked at 4.2 GHz, running astcenc using 6 threads.
## 2.2
**Status:** :warning: In development (ETA February 2021)
The 2.2 release is the third release in the 2.x series. It includes ...
## 2.1
**Status:** Released, November 2020
The 2.1 release is the second release in the 2.x series. It includes a number
of performance optimizations and new features.
Reminder for users of the library interface - the API is not designed to be
stable across versions, and this release is not compatible with 2.0. Please
recompile the client-side using the updated `astcenc.h` header.
### Features:
* **Command line:**
* **Bug fix:** The meaning of the `-tH\cH\dH` and `-th\ch\dh` compression
modes was inverted. They now match the documentation; use `-*H` for HDR
RGBA, and `-*h` for HDR RGB with LDR alpha.
* **Feature:** A new `-fastest` quality preset is now available. This is
designed for fast "roughing out" of new content, and sacrifices significant
image quality compared to `-fast`. We do not recommend its use for
production builds.
* **Feature:** A new `-candidatelimit` compression tuning option is now
available. This is a power-user control to determine how many candidates
are returned for each block mode encoding trial. This feature is used
automatically by the search presets; see `-help` for details.
* **Improvement:** The compression test modes (`-tl\ts\th\tH`) now emit a
MTex/s performance metric, in addition to coding time.
* **Core API:**
* **Feature:** A new quality preset `ASTCENC_PRE_FASTEST` is available. See
`-fastest` above for details.
* **Feature:** A new tuning option `tune_candidate_limit` is available in
the config structure. See `-candidatelimit` above for details.
* **Feature:** Image input/output can now use `ASTCENC_TYPE_F32` data types.
* **Stability:**
* **Feature:** The SSE2, SSE4.2, and AVX2 variants now produce identical
compressed output when run on the same CPU when compiled with the
preprocessor define `ASTCENC_ISA_INVARIANCE=1`. For Make builds this can
be set on the command line by setting `ISA_INV=1`. ISA invariance is off
by default; it reduces performance by 1-3%.
### Performance
Key for performance charts:
* Color = block size (see legend).
* Letter = image format (N = normal map, G = greyscale, L = LDR, H = HDR).
**Absolute performance vs 2.0 release:**
**Relative performance vs 2.0 release:**
## 2.0
**Status:** Released, August 2020
The 2.0 release is first release in the 2.x series. It includes a number of
major changes over the earlier 1.7 series, and is not command-line compatible.
### Features:
* The core codec can be built as a library, exposed via a new codec API.
* The core codec supports accelerated SIMD paths for SSE2, SSE4.2, and AVX2.
* The command line syntax has a clearer mapping to Khronos feature profiles.
### Performance:
Key for performance charts
* Color = block size (see legend).
* Letter = image format (N = normal map, G = greyscale, L = LDR, H = HDR).
**Absolute performance vs 1.7 release:**
**Relative performance vs 1.7 release:**
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