Does Suppress All Exceptions also suppress MXCSR updates?
Written by Grigory Rechistov in Uncategorized on 26.01.2024. Tags: sae, avx512, evex, mxcsr,
The question
Many x86 instructions from AVX512 and AVX10 families (encoded with EVEX prefix) allow specifying “suppress all exceptions” (SAE) flag in instruction’s opcode (EVEX.b field). While the intention of avoiding throwing exceptions on certain floating point inputs is clear, it is …