<p>Note that the AArch64 example is a bad one, because there are several different registers such have the same alternative names (it is not a one-to-one mapping) and so TableGen would crash in this case.</p>
<div class="gmail_quote">On Jun 17, 2015 2:47 PM, "Dylan McKay" <<a href="mailto:dylanmckay34@gmail.com">dylanmckay34@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><p style="margin:1.2em 0px!important">The machinery is in place, but AsmMatcher support isn’t implemented (I couldn’t see any mention of it in <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">utils/TableGen/AsmMatcherEmitter.cpp</code>. The instruction printer tablegen backend supports it (through the use of the <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">PRINT_ALIAS_INSTR</code> preprocessor define.</p>
<p style="margin:1.2em 0px!important">AArch64 uses the alternative name feature. Here is its AsmParser.cpp:</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248);white-space:pre-wrap;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important">static unsigned matchVectorRegName(StringRef Name) {
    return StringSwitch<unsigned>(Name.lower())
        .Case("v0", AArch64::Q0)
        .Case("v1", AArch64::Q1)
        .Case("v2", AArch64::Q2)
        .Case("v3", AArch64::Q3)
        .Case("v4", AArch64::Q4)
        .Case("v5", AArch64::Q5)
        .Case("v6", AArch64::Q6)
        .Case("v7", AArch64::Q7)
        .Case("v8", AArch64::Q8)
        .Case("v9", AArch64::Q9)
        .Case("v10", AArch64::Q10)
        .Case("v11", AArch64::Q11)
        .Case("v12", AArch64::Q12)
        .Case("v13", AArch64::Q13)
        .Case("v14", AArch64::Q14)
        .Case("v15", AArch64::Q15)
        .Case("v16", AArch64::Q16)
        .Case("v17", AArch64::Q17)
        .Case("v18", AArch64::Q18)
        .Case("v19", AArch64::Q19)
        .Case("v20", AArch64::Q20)
        .Case("v21", AArch64::Q21)
        .Case("v22", AArch64::Q22)
        .Case("v23", AArch64::Q23)
        .Case("v24", AArch64::Q24)
        .Case("v25", AArch64::Q25)
        .Case("v26", AArch64::Q26)
        .Case("v27", AArch64::Q27)
        .Case("v28", AArch64::Q28)
        .Case("v29", AArch64::Q29)
        .Case("v30", AArch64::Q30)
        .Case("v31", AArch64::Q31)
        .Default(0);
</code></pre><p style="margin:1.2em 0px!important">Which is a little bit redundant as this is all specified in TableGen.</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248);white-space:pre-wrap;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important">let SubRegIndices = [ssub], RegAltNameIndices = [vreg, vlist1] in {
def D0    : AArch64Reg<0,   "d0", [S0], ["v0", ""]>, DwarfRegAlias<B0>;
def D1    : AArch64Reg<1,   "d1", [S1], ["v1", ""]>, DwarfRegAlias<B1>;
def D2    : AArch64Reg<2,   "d2", [S2], ["v2", ""]>, DwarfRegAlias<B2>;
def D3    : AArch64Reg<3,   "d3", [S3], ["v3", ""]>, DwarfRegAlias<B3>;
def D4    : AArch64Reg<4,   "d4", [S4], ["v4", ""]>, DwarfRegAlias<B4>;
def D5    : AArch64Reg<5,   "d5", [S5], ["v5", ""]>, DwarfRegAlias<B5>;
def D6    : AArch64Reg<6,   "d6", [S6], ["v6", ""]>, DwarfRegAlias<B6>;
def D7    : AArch64Reg<7,   "d7", [S7], ["v7", ""]>, DwarfRegAlias<B7>;
def D8    : AArch64Reg<8,   "d8", [S8], ["v8", ""]>, DwarfRegAlias<B8>;
def D9    : AArch64Reg<9,   "d9", [S9], ["v9", ""]>, DwarfRegAlias<B9>;
def D10   : AArch64Reg<10, "d10", [S10], ["v10", ""]>, DwarfRegAlias<B10>;
def D11   : AArch64Reg<11, "d11", [S11], ["v11", ""]>, DwarfRegAlias<B11>;
def D12   : AArch64Reg<12, "d12", [S12], ["v12", ""]>, DwarfRegAlias<B12>;
def D13   : AArch64Reg<13, "d13", [S13], ["v13", ""]>, DwarfRegAlias<B13>;
def D14   : AArch64Reg<14, "d14", [S14], ["v14", ""]>, DwarfRegAlias<B14>;
def D15   : AArch64Reg<15, "d15", [S15], ["v15", ""]>, DwarfRegAlias<B15>;
def D16   : AArch64Reg<16, "d16", [S16], ["v16", ""]>, DwarfRegAlias<B16>;
def D17   : AArch64Reg<17, "d17", [S17], ["v17", ""]>, DwarfRegAlias<B17>;
def D18   : AArch64Reg<18, "d18", [S18], ["v18", ""]>, DwarfRegAlias<B18>;
def D19   : AArch64Reg<19, "d19", [S19], ["v19", ""]>, DwarfRegAlias<B19>;
def D20   : AArch64Reg<20, "d20", [S20], ["v20", ""]>, DwarfRegAlias<B20>;
def D21   : AArch64Reg<21, "d21", [S21], ["v21", ""]>, DwarfRegAlias<B21>;
def D22   : AArch64Reg<22, "d22", [S22], ["v22", ""]>, DwarfRegAlias<B22>;
def D23   : AArch64Reg<23, "d23", [S23], ["v23", ""]>, DwarfRegAlias<B23>;
def D24   : AArch64Reg<24, "d24", [S24], ["v24", ""]>, DwarfRegAlias<B24>;
def D25   : AArch64Reg<25, "d25", [S25], ["v25", ""]>, DwarfRegAlias<B25>;
def D26   : AArch64Reg<26, "d26", [S26], ["v26", ""]>, DwarfRegAlias<B26>;
def D27   : AArch64Reg<27, "d27", [S27], ["v27", ""]>, DwarfRegAlias<B27>;
def D28   : AArch64Reg<28, "d28", [S28], ["v28", ""]>, DwarfRegAlias<B28>;
def D29   : AArch64Reg<29, "d29", [S29], ["v29", ""]>, DwarfRegAlias<B29>;
def D30   : AArch64Reg<30, "d30", [S30], ["v30", ""]>, DwarfRegAlias<B30>;
def D31   : AArch64Reg<31, "d31", [S31], ["v31", ""]>, DwarfRegAlias<B31>;
</code></pre><div title="MDH:VGhlIG1hY2hpbmVyeSBpcyBpbiBwbGFjZSwgYnV0IEFzbU1hdGNoZXIgc3VwcG9ydCBpc24ndCBp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" style="min-height:0;width:0;max-height:0;max-width:0;overflow:hidden;font-size:0em;padding:0;margin:0">​</div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jun 17, 2015 at 2:21 PM, Jakob Stoklund Olesen <span dir="ltr"><<a href="mailto:stoklund@2pi.dk" target="_blank">stoklund@2pi.dk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">+Jim, Owen<div><br></div><div>Don’t we already have a mechanism for register name aliases, or am I mistaken?</div><div><br></div><div>Thanks,</div><div>/jakob</div><div><span style="white-space:pre-wrap">   </span><br><div><blockquote type="cite"><div><div><div>On Jun 16, 2015, at 8:08 AM, Dylan McKay <<a href="mailto:dylanmckay34@gmail.com" target="_blank">dylanmckay34@gmail.com</a>> wrote:</div><br></div></div><div><div><div><div dir="ltr"><div><p style="margin:1.2em 0px!important">This commit adds a new flag <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">ShouldEmitMatchRegisterAltName</code> to<br><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">include/Target/Target.td</code>, and generates an alternative register name matching function named <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">MatchRegisterAlias</code> to the generated AsmMatcher if it is enabled.</p><p style="margin:1.2em 0px!important">Backends can use this to parse alternative register names based on values stored<br>in TableGen files. The <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_avr-2Dllvm_llvm&d=AwMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=mQ4LZ2PUj9hpadE3cDHZnIdEwhEBrbAstXeMaFoB9tg&m=aCFCYs7XL0cSm4OQr_48l8G3UYs1R-X8a0RlaJL9uIU&s=MgYo8lh0Am21X7UJXYrRrInjWZMTPMp4Qj7OklnKMNg&e=" target="_blank">AVR-LLVM</a> project is using this function to parse special pointer registers, identified by <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">X</code>, <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">Y</code>, and <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">Z</code>, which are alternative names to the GPR pairs <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">r27:r26</code>, <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">r29:r28</code>, and <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">r31:r30</code>.</p><p style="margin:1.2em 0px!important">Files changed:</p>
<ul style="margin:1.2em 0px;padding-left:2em">
<li style="margin:0.5em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">include/Target/Target.td</code></li>
<li style="margin:0.5em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)">utils/TableGen/AsmMatcherEmitter.cpp</code></li>
</ul>
<div title="MDH:PGRpdj48YnI+PC9kaXY+PGRpdj48ZGl2PlRoaXMgY29tbWl0IGFkZHMgYSBuZXcgZmxhZyBgU2hv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" style="min-height:0;width:0;max-height:0;max-width:0;overflow:hidden;font-size:0em;padding:0;margin:0">​</div></div></div>
</div></div><span><0001-TableGen-Add-MatchRegisterAltName-to-AsmMatcher.patch></span></div></blockquote></div><br></div></div></blockquote></div><br></div>
</blockquote></div>