Commit Graph

11 Commits

Author SHA1 Message Date
Sam Lantinga 5e13087b0f Updated copyright for 2019 2019-01-04 22:01:14 -08:00
Ryan C. Gordon 4df859c586 cpuinfo: Added SDL_HasAVX512F().
This checks for the "foundation" AVX-512 instructions (that all AVX-512
compatible CPUs support).
2018-05-21 11:35:42 -04:00
Sam Lantinga e3cc5b2c6b Updated copyright for 2018 2018-01-03 10:03:25 -08:00
Sam Lantinga a225ffc1d7 Added min/max macros for the sized SDL datatypes 2017-10-16 14:39:56 -07:00
Sam Lantinga 45b774e3f7 Updated copyright for 2017 2017-01-01 18:33:28 -08:00
Ryan C. Gordon 35430a73f2 cpuinfo: first attempt at SDL_HasNEON() implementation. 2016-11-17 01:15:16 -05:00
Sam Lantinga 0396af651a Shifting a value by more than its bits isn't defined and has varying behavior depending on compiler and platform 2016-11-06 14:13:28 -08:00
Sam Lantinga 40b571c91e Fixed bug 3468 - _allshr in SDL_stdlib.c is not working properly
Mark Pizzolato

On Windows with Visual Studio, when building SDL as a static library using the x86 (32bit) mode, several intrinsic operations are implemented in code in SDL_stdlib.c.

One of these, _allshr() is not properly implemented and fails for some input.  As a result, some operations on 64bit data elements (long long) don't always work.

I classified this bug as a blocker since things absolutely don't work when the affected code is invoked.  The affected code is only invoked when SDL is compiled in x86 mode on Visual Studio when building a SDL as a static library.  This build environment isn't common, and hence the bug hasn't been noticed previously.

I reopened  and mentioned this problem and provided a fix.  That fix is provided again here along with test code which could be added to some of the SDL test code.  This test code verifies that the x86 intrinsic routines produce the same results as the native x64 instructions which these routines emulate under the Microsoft compiler.  The point of the tests is to make sure that Visual Studio x86 code produces the same results as Visual Studio x64 code.  Some of the arguments (or boundary conditions) may produce different results on other compiler environments, so the tests really shouldn't be run on all compilers.  The test driver only actually exercised code when the compiler defines _MSC_VER, so the driver can generically be invoked without issue.
2016-11-06 10:01:08 -08:00
Philipp Wiesemann 98d188f5de Added call to SDL_HasAVX2() in platform test program. 2016-10-30 21:01:46 +01:00
Sam Lantinga 42065e785d Updated copyright to 2016 2016-01-02 10:10:34 -08:00
Philipp Wiesemann 0e45984fa0 Fixed crash if initialization of EGL failed but was tried again later.
The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly
uninitialized data structure if loading the library first failed. A later try to
use EGL then skipped initialization and assumed it was previously successful
because the data structure now already existed. This led to at least one crash
in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was
dereferenced to make a call to eglBindAPI().
2015-06-21 17:33:46 +02:00