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Minor tweak to FASTCALL3 instruction

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In all other places, L->top is extracted to a local when writing to stack;
this helps compilers without TBAA (MSVC) to not reload L->top redundantly.

Also assert that we do in fact have 2 slots of stack space (which we do).
This commit is contained in:
Arseny Kapoulkine 2024-11-27 11:46:41 +09:00
parent d19a5f0699
commit 38e9317925
1 changed files with 6 additions and 3 deletions
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9
VM/src/lvmexecute.cpp
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@ -2923,10 +2923,13 @@ reentry:
{
VM_PROTECT_PC(); // f may fail due to OOM
setobj2s(L, L->top, arg2);
setobj2s(L, L->top + 1, arg3);
// note: it's safe to push arguments past top for complicated reasons (see top of the file)
LUAU_ASSERT(L->top + 2 < L->stack + L->stacksize);
StkId top = L->top;
setobj2s(L, top, arg2);
setobj2s(L, top + 1, arg3);
int n = f(L, ra, arg1, nresults, L->top, nparams);
int n = f(L, ra, arg1, nresults, top, nparams);
if (n >= 0)
{