I am interested in whether stdcall uses SSE registers on x86, and if so, will it restore them, like ESI, EDI, EBP, EBX?

CodePudding user response：

No.

As you mentioned, the Windows x86-32 ABI specifies that EAX, EDX, and ECX are available as "scratch" registers inside of the function (clobbered); all of the other general-purpose integer registers are preserved (i.e., EBX, ESI, EDI, EBP, and EIP). This doesn't apply to SSE registers; only to general-purpose integer registers. All of the SSE registers are considered to be clobbered.