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Optimizations for stack checks when no over/under flow is present #2709

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Optimizations for stack checks when no over/under flow is present #2709

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3ba1eb5
kevm-pyk/evm: use function, not macro, for stack under/over-flow
ehildenb Feb 24, 2025
386c5d1
kevm-pyk/evm: optimize for non-overflow cases on stack checks
ehildenb Feb 24, 2025
51deb06
kevm-pyk/evm.md: optimize for non-underflow stack check
ehildenb Feb 24, 2025
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kevm-pyk/evm: optimize for non-overflow cases on stack checks
@ehildenb
ehildenb committed Mar 5, 2025
commit 386c5d1e51d0b5616f9beddd451eeee025c3d382
4 changes: 3 additions & 1 deletion kevm-pyk/src/kevm_pyk/kproj/evm-semantics/evm.md
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Original file line number Diff line number Diff line change
@@ -381,7 +381,9 @@ The `#next [_]` operator initiates execution by:
| #stackOverflow ( WordStack , OpCode ) [symbol(#stackOverflow), function, total]
// ------------------------------------------------------------------------------------------------
rule #stackUnderflow(WS, OP:OpCode) => #sizeWordStack(WS) <Int #stackNeeded(OP)
rule #stackOverflow (WS, OP) => (#stackDelta(OP) >Int 0) andBool (#sizeWordStack(WS) +Int #stackDelta(OP) >Int 1024)

rule #stackOverflow(_WS, OP) => false requires #stackDelta(OP) <=Int 0
rule #stackOverflow(WS, OP) => 1024 <Int #sizeWordStack(WS) +Int #stackDelta(OP) [owise]

syntax Int ::= #stackNeeded ( OpCode ) [symbol(#stackNeeded), function]
// -----------------------------------------------------------------------