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add subcase of yellow paper equation (297) for zero-length memory ranges

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This commit is contained in:
Dustin Brody 2018-07-23 14:00:49 -07:00
parent 7f4d97dca0
commit 00cd33febd
2 changed files with 13 additions and 2 deletions
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4
VMTests.md
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@ -669,14 +669,14 @@ OK: 0/17 Fail: 0/17 Skip: 17/17
+ sha3_bigSize.json OK
+ sha3_memSizeNoQuadraticCost31.json OK
+ sha3_memSizeQuadraticCost32.json OK
- sha3_memSizeQuadraticCost32_zeroSize.json Fail
+ sha3_memSizeQuadraticCost32_zeroSize.json OK
+ sha3_memSizeQuadraticCost33.json OK
+ sha3_memSizeQuadraticCost63.json OK
+ sha3_memSizeQuadraticCost64.json OK
+ sha3_memSizeQuadraticCost64_2.json OK
+ sha3_memSizeQuadraticCost65.json OK
```
OK: 17/18 Fail: 1/18 Skip: 0/18
OK: 18/18 Fail: 0/18 Skip: 0/18
## vmSystemOperations
```diff
ABAcalls0.json Skip

11
nimbus/vm/interpreter/gas_costs.nim
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@ -120,6 +120,17 @@ template gasCosts(FeeSchedule: GasFeeSchedule, prefix, ResultGasCostsName: untyp
# μ'i is the memory size after opcode execution
# Cmem(a) ≡ Gmemory · a + a² / 512
#
# Except when memLength = 0, where per eq (297),
# M(currentMemSize, f, l) = currentMemSize
if memLength == 0:
# Special subcase of memory-expansion cost
# currentMemSize - currentMemSize = 0
# "Referencing a zero length range ... does not require memory to be extended
# to the beginning of the range."
return 0
let
prev_words = currentMemSize.wordCount
prev_cost = prev_words * static(FeeSchedule[GasMemory]) +