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Unroll first and last iteration in encoding #545

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Unroll first and last iteration in encoding #545

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cbb6c1c
Unroll first and last iteration in encoding
JonasAlaif Dec 6, 2021
a8911de
Branch on !cond when unrolling first iteration
JonasAlaif Dec 6, 2021
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9 changes: 7 additions & 2 deletions src/main/scala/viper/silver/cfg/silver/CfgGenerator.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -185,17 +185,22 @@ object CfgGenerator {
// check whether the loop is tagged with an id
val loopId = stmt.info.getUniqueInfo[IdInfo].map(_.id)
// create labels
val thnTarget = TmpLabel.generate("then")
val headTarget = TmpLabel.generate("head")
val loopTarget = TmpLabel.generate("loop")
val afterTarget = TmpLabel.generate("after")
// unroll first iter
addStatement(ConditionalJumpStmt(Not(cond)(), afterTarget, thnTarget))
addLabel(thnTarget)
// process loop head
addLabel(headTarget, addEmptyStmt = false)
addStatement(LoopHeadStmt(invs, afterTarget, loopId))
addStatement(ConditionalJumpStmt(cond, loopTarget, afterTarget))
addStatement(JumpStmt(loopTarget))
// process loop body
addLabel(loopTarget)
addStatement(WrappedStmt(Inhale(cond)()))
run(body)
addStatement(JumpStmt(headTarget))
addStatement(ConditionalJumpStmt(cond, headTarget, afterTarget))
// set label after loop
addLabel(afterTarget)
case Seqn(ss, scopedDecls) =>
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