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loop unrolled for stack marking

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This commit is contained in:
Araq 2011-05-13 19:14:49 +02:00
commit f45967537f
3 changed files with 33 additions and 1 deletions
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13
lib/system/gc.nim
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@ -626,10 +626,23 @@ else:
# We use a jmp_buf buffer that is in the C stack.
# Used to traverse the stack and registers assuming
# that 'setjmp' will save registers in the C stack.
type PStackSlice = ptr array [0..7, pointer]
var registers: C_JmpBuf
if c_setjmp(registers) == 0'i32: # To fill the C stack with registers.
var max = cast[TAddress](stackBottom)
var sp = cast[TAddress](addr(registers))
# loop unrolled:
while sp <% max - 8*sizeof(pointer):
gcMark(cast[PStackSlice](sp)[0])
gcMark(cast[PStackSlice](sp)[1])
gcMark(cast[PStackSlice](sp)[2])
gcMark(cast[PStackSlice](sp)[3])
gcMark(cast[PStackSlice](sp)[4])
gcMark(cast[PStackSlice](sp)[5])
gcMark(cast[PStackSlice](sp)[6])
gcMark(cast[PStackSlice](sp)[7])
sp = sp +% sizeof(pointer)*8
# last few entries:
while sp <=% max:
gcMark(cast[ppointer](sp)[])
sp = sp +% sizeof(pointer)