I think that the `mov r11, r8` is showing a lot of samples because r8 is coming from memory and that instruction is the point at which the CPU has to stall. The situation is probably similar with the vucomiss instruction - it's trying to operate on a value that is coming from memory right beforehand so it can't proceed until that load is completed.
Bug 1911160 Comment 3 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
I think that the `mov r11, r8` is showing a lot of samples because r8 is coming from memory and that instruction is the point at which the CPU has to stall. The situation is probably similar with the `vucomiss` instruction - it's trying to operate on a value that is coming from memory right beforehand so it can't proceed until that load is completed.