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84 lines
1.7 KiB
84 lines
1.7 KiB
-- $Id: bitwise.lua,v 1.24 2014/12/26 17:20:53 roberto Exp $
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print("testing bitwise operations")
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local numbits: integer = string.packsize('j')
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numbits = numbits * 8
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function toint(x)
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return x
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end
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function testbits()
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assert(~0 == -1)
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assert((1 << (numbits - 1)) == math.mininteger)
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-- basic tests for bitwise operators;
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-- use variables to avoid constant folding
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local a : integer, b: integer, c: integer, d: integer
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a = 0xFFFFFFFFFFFFFFFF
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assert(a == -1 and a & -1 == a and a & 35 == 35)
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a = 0xF0F0F0F0F0F0F0F0
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assert(a | -1 == -1)
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assert(a ~ a == 0 and a ~ 0 == a and a ~ ~a == -1)
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assert(a >> 4 == ~a)
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a = 0xF0; b = 0xCC; c = 0xAA; d = 0xFD
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assert(a | b ~ c & d == 0xF4)
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a = 0xF0000000; b = 0xCC000000;
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c = 0xAA000000; d = 0xFD000000
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assert(a | b ~ c & d == 0xF4000000)
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assert(~~a == a and ~a == -1 ~ a and -d == ~d + 1)
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print'+'
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a = a << 32
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b = b << 32
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c = c << 32
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d = d << 32
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assert(a | b ~ c & d == 0xF4000000 << 32)
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assert(~~a == a and ~a == -1 ~ a and -d == ~d + 1)
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print'+'
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--a = -1 >> 1
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--b = toint(2^(numbits - 1) - 1)
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--print'+'
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--c = 1 << 31
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--d = 0x80000000
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--assert(a == b and c == d)
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--assert(-1 >> (numbits - 1) == 1)
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a = -1 >> numbits
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b = -1 >> -numbits
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c = -1 << numbits
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d = -1 << -numbits
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assert(a == 0 and
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b == 0 and
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c == 0 and
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d == 0)
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print'+'
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a = @integer math.tointeger(2^30) - 1
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b = @integer math.tointeger(2^30) - 1
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c = @integer math.tointeger(2^30)
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d = @integer math.tointeger(2^30)
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assert((a) << c == 0)
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assert((b) >> d == 0)
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print'+'
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a = 1 >> -3
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b = 1 << 3
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c = 1000 >> 5
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d = 1000 << -5
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print'+'
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assert(a == b and c == d)
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end
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ravi.dumplua(testbits)
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assert(ravi.compile(testbits))
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testbits()
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print'OK' |