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compiler: move allocations > 256 bytes to the heap

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This commit is contained in:
Damian Gryski
2022-02-10 19:28:34 -08:00
committed by Ron Evans
parent f2fef290c9
commit 4b2edc9a26
2 changed files with 4 additions and 2 deletions
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compiler/compiler.go
+3 -2
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@@ -1571,8 +1571,9 @@ func (b *builder) createExpr(expr ssa.Value) (llvm.Value, error) {
switch expr := expr.(type) {
case *ssa.Alloc:
typ := b.getLLVMType(expr.Type().Underlying().(*types.Pointer).Elem())
if expr.Heap {
size := b.targetData.TypeAllocSize(typ)
size := b.targetData.TypeAllocSize(typ)
// Move all "large" allocations to the heap. This value is also transform.maxStackAlloc.
if expr.Heap || size > 256 {
// Calculate ^uintptr(0)
maxSize := llvm.ConstNot(llvm.ConstInt(b.uintptrType, 0, false)).ZExtValue()
if size > maxSize {