Opened 15 years ago
Closed 15 years ago
#48 closed defect (fixed)
Enable MMX/SSE
| Reported by: | Dmitry A. Kuminov | Owned by: | |
|---|---|---|---|
| Priority: | major | Milestone: | Qt 4.6.2 |
| Component: | General | Version: | 4.5.1 Beta 1 |
| Severity: | high | Keywords: | |
| Cc: |
Description
The Qt4 painting engine makes usage of various MMX/3DNow and SSE/SSE2 extensions on platforms which support it. These extensions seem to be accessed through the inclusion of <mmintrin.h>, <mm3dnow.h>, <xmmintrin.h> and <emmintrin.h> headers provided by the platform's compiler.
GCC for OS/2 doesn't have these headers. This ticket is to investigate where to get them and how to adopt to our compiler.
Change History (4)
comment:1 by , 15 years ago
| Severity: | → high |
|---|
comment:2 by , 15 years ago
| Milestone: | Qt Enhanced → Qt 4.6.1 |
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comment:3 by , 15 years ago
Enabled in r617 early to give it some testing before the release. Note that you need to re-run configure.cmd and touch src/gui/painting/qdrawhelper.cpp to get it involved.
So far, I don't see any significant performance change in the tests/blit test case when using MMX/SSE on my machine. This may be due to the fact that I a) only tried the debug build or b) run it in the virtualized environment.
So, somebody with the real hardware and the release build of the trunk, please record the tests/blit numbers (see last comments in #101 for details) before r617 and after it (don't forget to run configure and touch qdrawhelper.cpp).
comment:4 by , 15 years ago
| Resolution: | → fixed |
|---|---|
| Status: | new → closed |
Silvan did some tests in #101. Closing this one.
Actually, GGC 3.3.5 contains all these headers but mm3dnow.h. GCC 4.4.2 contains all of them. So it should be easy to enable now.