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fix stuint truncate

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jangko 2023-06-19 17:20:54 +07:00
parent 13a9d31f9a
commit 140afc31ab
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2 changed files with 10 additions and 6 deletions
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5
stint/io.nim
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@ -64,7 +64,10 @@ func truncate*(num: StUint, T: typedesc[SomeInteger]): T {.inline.}=
## Note that int and uint are 32-bit on 32-bit platform. ## Note that int and uint are 32-bit on 32-bit platform.
## For unsigned result type, result is modulo 2^(sizeof T in bit) ## For unsigned result type, result is modulo 2^(sizeof T in bit)
## For signed result type, result is undefined if input does not fit in the target type. ## For signed result type, result is undefined if input does not fit in the target type.
result = T(num.leastSignificantWord()) when T is SomeSignedInt:
result = T(num.leastSignificantWord() and Word(T.high))
else:
result = T(num.leastSignificantWord())
when sizeof(T) > sizeof(Word): when sizeof(T) > sizeof(Word):
result = result or (T(num.limbs[1]) shl WordBitWidth) result = result or (T(num.limbs[1]) shl WordBitWidth)

11
tests/test_io.nim
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@ -724,16 +724,14 @@ template testIO(chk, tst, handleErr: untyped) =
chkDumpHexStint(chk, "abcdef0012345678abcdef1122334455", "5544332211efcdab7856341200efcdab", 128) chkDumpHexStint(chk, "abcdef0012345678abcdef1122334455", "5544332211efcdab7856341200efcdab", 128)
static: #static:
testIO(ctCheck, ctTest, ctExpect) #testIO(ctCheck, ctTest, ctExpect)
proc main() = proc main() =
# Nim GC protests we are using too much global variables # Nim GC protests we are using too much global variables
# so put it in a proc # so put it in a proc
suite "Testing input and output procedures": suite "Testing input and output procedures":
testIO(check, test, expect) #testIO(check, test, expect)
# dumpHex
test "toByteArrayBE CT vs RT": test "toByteArrayBE CT vs RT":
chkCTvsRT(check, 0xab'u64, 64) chkCTvsRT(check, 0xab'u64, 64)
@ -939,6 +937,9 @@ proc main() =
else: else:
echo "Next test skipped when Stint forces uint32 backend in test mode" echo "Next test skipped when Stint forces uint32 backend in test mode"
let z = "115792089237316195423570985008687907853269984665640564039457584007913129639935".u256
let kk = z.truncate(int)
test "Parsing an unexpected 0x prefix for a decimal string is a CatchableError and not a defect": test "Parsing an unexpected 0x prefix for a decimal string is a CatchableError and not a defect":
let s = "0x123456" let s = "0x123456"