https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69648
--- Comment #1 from Zdenek Sojka <zsojka at seznam dot cz> --- Created attachment 37566 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37566&action=edit output assembly (intel syntax) The failing instructions are around line 156: mov eax, DWORD PTR 60[esp] # tmp87, %sfp pinsrw xmm0, WORD PTR .LC9@GOTOFF[eax], 1 # tmp276,, The code is using eax,ebx,ecx as a base for accessing of the data - but only one register would be enough. This might be caused by the low optimisation level though.