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flst / upstream /emscripten /system /lib /compiler-rt /stack_ops.S
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.globl _emscripten_stack_restore
.globl _emscripten_stack_alloc
.globl emscripten_stack_get_current
#ifdef __wasm64__
#define PTR i64
#define MASK 0xfffffffffffffff0
#else
#define PTR i32
#define MASK 0xfffffff0
#endif
.globaltype __stack_pointer, PTR
_emscripten_stack_restore:
.functype _emscripten_stack_restore(PTR) -> ()
local.get 0
global.set __stack_pointer
end_function
_emscripten_stack_alloc:
.functype _emscripten_stack_alloc(PTR) -> (PTR)
.local PTR, PTR
global.get __stack_pointer
# Get arg 0 -> number of bytes to allocate
local.get 0
# Stack grows down. Subtract arg0 from __stack_pointer
PTR.sub
# Align result by anding with ~15
PTR.const MASK
PTR.and
local.tee 1
global.set __stack_pointer
local.get 1
end_function
emscripten_stack_get_current:
.functype emscripten_stack_get_current () -> (PTR)
global.get __stack_pointer
end_function