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    SubjectRe: [patch 14/24] Immediate Values - x86 Optimization
    Mathieu Desnoyers wrote:
    > Argh.. Rusty asked to have a simplified version first, and then to
    > implement the "more complex" one on top of it. However, in order to get
    > the reentrancy I need for the markers, I need the complex version of the
    > immediate values. Therefore, you find, in this patchset, the simple
    > version first, and then, the more complex one implemented on top.
    > About this patch header, the initial idea was to use the "Q" and "R"
    > constraints, but, as stated just below, the "q" and "r" constraints are
    > used instead to make sure the REX prefixed opcodes for 1, 2, and 4 bytes
    > immediate values are never used. So the complete header follows the
    > source code, it's just that this paragraph could be clearer.

    Then you have it backwards. "Q" and "R" avoid REX prefixes, "q" and "r"
    DO NOT.


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