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Add an env var to turn off use of SIMD instructions

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Kovid Goyal
2024-01-21 15:19:40 +05:30
parent eee14ae148
commit 23a4012aeb
2 changed files with 8 additions and 0 deletions
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5
docs/glossary.rst
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@@ -230,3 +230,8 @@ Variables that kitty sets when running child programs
Set to ``1`` when kitty is running a shell because of the ``--hold`` flag. Can Set to ``1`` when kitty is running a shell because of the ``--hold`` flag. Can
be used to specialize shell behavior in the shell rc files as desired. be used to specialize shell behavior in the shell rc files as desired.
.. envvar:: KITTY_NO_SIMD
Set it to any value to prevent kitty from using SIMD CPU vector
instructions.

3
kitty/simd-string.c
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@@ -143,6 +143,9 @@ init_simd(void *x) {
do_check(); do_check();
#endif #endif
#endif #endif
if (getenv("KITTY_NO_SIMD")) {
has_avx2 = false; has_sse4_2 = false;
}
#undef do_check #undef do_check
if (has_avx2) { if (has_avx2) {