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gen: c don't generate x >= 0 check for unsigned ints in range exprs in matches (#6414)
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@ -2671,11 +2671,21 @@ fn (mut g Gen) match_expr(node ast.MatchExpr) {
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g.expr(expr)
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g.expr(expr)
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g.write(')')
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g.write(')')
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} else if expr is ast.RangeExpr {
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} else if expr is ast.RangeExpr {
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// if type is unsigned and low is 0, check is unneeded
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mut skip_low := false
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if expr.low is ast.IntegerLiteral as expr_low {
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if node.cond_type in [table.u16_type, table.u32_type, table.u64_type] &&
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expr_low.val == '0' {
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skip_low = true
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}
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}
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g.write('(')
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g.write('(')
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if !skip_low {
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g.write(cond_var)
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g.write(cond_var)
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g.write(' >= ')
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g.write(' >= ')
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g.expr(expr.low)
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g.expr(expr.low)
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g.write(' && ')
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g.write(' && ')
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}
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g.write(cond_var)
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g.write(cond_var)
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g.write(' <= ')
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g.write(' <= ')
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g.expr(expr.high)
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g.expr(expr.high)
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