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compiler: use shorter and cheaper sequence to convert to Boolean

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This commit is contained in:
Roman Khimov 2022-10-25 18:20:55 +03:00
parent 5d43367082
commit 4e58bd7411
1 changed files with 10 additions and 4 deletions
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6
pkg/compiler/codegen.go
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@ -1945,11 +1945,17 @@ func transformArgs(fs *funcScope, fun ast.Expr, isBuiltin bool, args []ast.Expr)
// emitConvert converts the top stack item to the specified type.
func (c *codegen) emitConvert(typ stackitem.Type) {
if typ == stackitem.BooleanT {
// DUP + ISTYPE + JMPIF costs 3 already with CONVERT of a cost 8192.
// NOT+NOT at the same time costs 4 and always works (and is shorter).
emit.Opcodes(c.prog.BinWriter, opcode.NOT, opcode.NOT)
} else {
emit.Opcodes(c.prog.BinWriter, opcode.DUP)
emit.Instruction(c.prog.BinWriter, opcode.ISTYPE, []byte{byte(typ)})
emit.Instruction(c.prog.BinWriter, opcode.JMPIF, []byte{2 + 2}) // After CONVERT.
emit.Instruction(c.prog.BinWriter, opcode.CONVERT, []byte{byte(typ)})
}
}
func (c *codegen) convertByteArray(elems []ast.Expr) {
buf := make([]byte, len(elems))