mirrors/Nim
1
0
Fork 0
mirror of https://github.com/nim-lang/Nim.git synced 2026-08-27 09:01:37 +00:00
Code Issues Packages Projects Releases Wiki Activity

Vm bitops fixes (#10520)

Browse Source
This commit is contained in:
Arne Döring
2019-02-05 09:31:37 +01:00
committed by narimiran
parent eb42853ff4
commit c9441c6f79
5 changed files with 92 additions and 51 deletions
Download Patch File Download Diff File Expand all files Collapse all files

101
tests/stdlib/tbitops.nim
View File

@@ -1,10 +1,9 @@
discard """
file: "tbitops.nim"
nimout: "OK"
output: "OK"
"""
import bitops
proc main() =
const U8 = 0b0011_0010'u8
const I8 = 0b0011_0010'i8
@@ -80,25 +79,6 @@ proc main() =
doAssert( U8.rotateLeftBits(3) == 0b10010001'u8)
doAssert( U8.rotateRightBits(3) == 0b0100_0110'u8)
static :
# test bitopts at compile time with vm
doAssert( U8.fastLog2 == 5)
doAssert( I8.fastLog2 == 5)
doAssert( U8.countLeadingZeroBits == 2)
doAssert( I8.countLeadingZeroBits == 2)
doAssert( U8.countTrailingZeroBits == 1)
doAssert( I8.countTrailingZeroBits == 1)
doAssert( U8.firstSetBit == 2)
doAssert( I8.firstSetBit == 2)
doAssert( U8.parityBits == 1)
doAssert( I8.parityBits == 1)
doAssert( U8.countSetBits == 3)
doAssert( I8.countSetBits == 3)
doAssert( U8.rotateLeftBits(3) == 0b10010001'u8)
doAssert( U8.rotateRightBits(3) == 0b0100_0110'u8)
template test_undefined_impl(ffunc: untyped; expected: int; is_static: bool) =
doAssert( ffunc(0'u8) == expected)
doAssert( ffunc(0'i8) == expected)
@@ -143,26 +123,67 @@ proc main() =
doAssert( U64A.rotateLeftBits(64) == U64A)
doAssert( U64A.rotateRightBits(64) == U64A)
static: # check for undefined behavior with rotate by zero.
doAssert( U8.rotateLeftBits(0) == U8)
doAssert( U8.rotateRightBits(0) == U8)
doAssert( U16.rotateLeftBits(0) == U16)
doAssert( U16.rotateRightBits(0) == U16)
doAssert( U32.rotateLeftBits(0) == U32)
doAssert( U32.rotateRightBits(0) == U32)
doAssert( U64A.rotateLeftBits(0) == U64A)
doAssert( U64A.rotateRightBits(0) == U64A)
# check for undefined behavior with rotate by integer width.
doAssert( U8.rotateLeftBits(8) == U8)
doAssert( U8.rotateRightBits(8) == U8)
doAssert( U16.rotateLeftBits(16) == U16)
doAssert( U16.rotateRightBits(16) == U16)
doAssert( U32.rotateLeftBits(32) == U32)
doAssert( U32.rotateRightBits(32) == U32)
doAssert( U64A.rotateLeftBits(64) == U64A)
doAssert( U64A.rotateRightBits(64) == U64A)
block:
# mask operations
var v: uint8
v.setMask(0b1100_0000)
v.setMask(0b0000_1100)
doAssert(v == 0b1100_1100)
v.flipMask(0b0101_0101)
doAssert(v == 0b1001_1001)
v.clearMask(0b1000_1000)
doAssert(v == 0b0001_0001)
v.clearMask(0b0001_0001)
doAssert(v == 0b0000_0000)
block:
# single bit operations
var v: uint8
v.setBit(0)
doAssert v == 0x0000_0001
v.setBit(1)
doAssert v == 0b0000_0011
v.flipBit(7)
doAssert v == 0b1000_0011
v.clearBit(0)
doAssert v == 0b1000_0010
v.flipBit(1)
doAssert v == 0b1000_0000
doAssert v.testbit(7)
doAssert not v.testbit(6)
block:
# multi bit operations
var v: uint8
v.setBits(0, 1, 7)
doAssert v == 0b1000_0011
v.flipBits(2, 3)
doAssert v == 0b1000_1111
v.clearBits(7, 0, 1)
doAssert v == 0b0000_1100
block:
# signed
var v: int8
v.setBit(7)
doAssert v == -128
block:
var v: uint64
v.setBit(63)
doAssert v == 0b1000_0000_0000_0000_0000_0000_0000_0000_0000_0000_0000_0000_0000_0000_0000_0000'u64
echo "OK"
block: # not ready for vm because exception is compile error
try:
var v: uint32
var i = 32
v.setBit(i)
doAssert false
except RangeError:
discard
except:
doAssert false
main()
static:
# test everything on vm as well
main()