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m4/ax_linuxkm.m4: in the AX_SIMD_CC_COMPILER_FLAGS setup, drop the -mavx and 

-mavx2 AX_APPEND_COMPILE_FLAGS. gcc emits AVX instructions unbidden under those
flags (e.g. for 128-bit types) in code paths that cannot be runtime-dispatched
on cpuid, leading to invalid-opcode crashes on CPUs lacking AVX (e.g. Westmere).
pull/11031/head
Daniel Pouzzner 2026-08-03 22:29:42 -05:00
parent e5b3fb118e
commit 6e2b6f676c
1 changed files with 3 additions and 2 deletions
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m4/ax_linuxkm.m4
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@ -77,8 +77,9 @@ AC_DEFUN([AX_SIMD_CC_COMPILER_FLAGS], [
AX_APPEND_COMPILE_FLAGS([-mmmx],[CFLAGS_SIMD_ENABLE])
AX_APPEND_COMPILE_FLAGS([-msse2],[CFLAGS_SIMD_ENABLE])
AX_APPEND_COMPILE_FLAGS([-msse4],[CFLAGS_SIMD_ENABLE])
AX_APPEND_COMPILE_FLAGS([-mavx],[CFLAGS_SIMD_ENABLE])
AX_APPEND_COMPILE_FLAGS([-mavx2],[CFLAGS_SIMD_ENABLE])
# Don't add -mavx or -mavx2 -- gcc will emit AVX instructions unbidden,
# e.g. for 128 bit types, that can't be runtime-dispatched based on cpuid, leading
# to crashes (unknown opcodes) on CPUs lacking AVX.
AX_APPEND_COMPILE_FLAGS([-mno-general-regs-only],[CFLAGS_SIMD_ENABLE])
fi