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45 lines
1.3 KiB
Nim
45 lines
1.3 KiB
Nim
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const RANGE = -384.. -127
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proc get_values(): (seq[int8], seq[int16], seq[int32]) =
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let i8 = -3'i8
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let i16 = -3'i16
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let i32 = -3'i32
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doAssert i8.ze == 0xFD
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doAssert i8.ze64 == 0xFD
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doAssert i16.ze == 0xFFFD
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doAssert i16.ze64 == 0xFFFD
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result[0] = @[]; result[1] = @[]; result[2] = @[]
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for offset in RANGE:
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let i8 = -(1'i64 shl 9) + offset
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let i16 = -(1'i64 shl 17) + offset
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let i32 = -(1'i64 shl 33) + offset
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# higher bits are masked. these should be exactly equal to offset.
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result[0].add cast[int8](cast[uint64](i8))
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result[1].add cast[int16](cast[uint64](i16))
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result[2].add cast[int32](cast[uint64](i32))
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# these values this computed by VM
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const COMPILETIME_VALUES = get_values()
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# these values this computed by compiler
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let RUNTIME_VALUES = get_values()
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template check_values(int_type: static[int]) =
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var index = 0
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let cvalues = COMPILETIME_VALUES[int_type]
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let rvalues = RUNTIME_VALUES[int_type]
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for offset in RANGE:
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let moffset = cast[type(rvalues[0])](offset)
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doAssert(moffset == rvalues[index] and moffset == cvalues[index],
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"expected: " & $moffset & " got runtime: " & $rvalues[index] & " && compiletime: " & $cvalues[index] )
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inc(index)
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check_values(0) # uint8
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check_values(1) # uint16
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check_values(2) # uint32
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