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IBM Basic assembly language and successors: Difference between revisions

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No, an SR that doesn't generate an overflow (subtracting a register from itself won't generate an overflow) is as fast as or faster than XR on S/360 models 30, 40, 50, 65, and 75. Do you have any reliable sources indicating that, on some other models, XR is faster?
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}} <code>USING</code> statements, a list of <code>USING</code> statements currently active, an indication of whether a variable is read or written in the cross-reference, and allowing mixed-case symbol names.<ref name="hlasm-announcement-letter" />
</ref> The <code>RSECT</code> directive (Read-only Control Section) allows the assembler to check reentrancy on a per-section basis. <code>RSECT</code> was previously "undocumented and inconsistently implemented in Assembler H."<ref>{{cite book
| title = IBM High Level Assembler for MVS & VM & VSE Release 2 Presentation Guide
| id = SG24-3910-01
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