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more fixes for --cpu:avr [backport] (#12748)

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Andreas Rumpf 2019-11-27 16:24:21 +01:00 • committed by GitHub
commit fd85a5ae05
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4 changed files with 8 additions and 5 deletions
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lib/system/sets.nim
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@ -19,7 +19,7 @@ proc countBits32(n: uint32): int {.compilerproc.} =
var v = uint32(n)
v = v - ((v shr 1'u32) and 0x55555555'u32)
v = (v and 0x33333333'u32) + ((v shr 2'u32) and 0x33333333'u32)
result = (((v + (v shr 4'u32) and 0xF0F0F0F'u32) * 0x1010101) shr 24'u32).int
result = (((v + (v shr 4'u32) and 0xF0F0F0F'u32) * 0x1010101'u32) shr 24'u32).int
proc countBits64(n: uint64): int {.compilerproc, inline.} =
# generic formula is from: https://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel