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[Opt] Added a feature to the Compiler to remove dead moves (moves to itself) when it's provable that it's safe

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kobalicek
2022-04-05 00:00:30 +02:00
parent 752eb38a4d
commit 8fdee13aea
11 changed files with 1733 additions and 1539 deletions
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51
tools/tablegen-x86.js
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@@ -1786,6 +1786,7 @@ class AdditionalInfoTable extends core.Task {
run() {
const insts = this.ctx.insts;
const rwInfoTable = new IndexedArray();
const instFlagsTable = new IndexedArray();
const additionaInfoTable = new IndexedArray();
// If the instruction doesn't read any flags it should point to the first index.
@@ -1800,9 +1801,48 @@ class AdditionalInfoTable extends core.Task {
var [r, w] = this.rwFlagsOf(dbInsts);
const rData = r.map(function(flag) { return `FLAG(${flag})`; }).join(" | ") || "0";
const wData = w.map(function(flag) { return `FLAG(${flag})`; }).join(" | ") || "0";
const rwDataIndex = rwInfoTable.addIndexed(`{ ${rData}, ${wData} }`);
const instFlags = Object.create(null);
inst.additionalInfoIndex = additionaInfoTable.addIndexed(`{ { ${features} }, ${rwDataIndex}, 0 }`);
switch (inst.name) {
case "kmovb":
case "kmovd":
case "kmovq":
case "kmovw":
case "mov":
case "movq":
case "movsd":
case "movss":
case "movapd":
case "movaps":
case "movdqa":
case "movdqu":
case "movupd":
case "movups":
case "vmovapd":
case "vmovaps":
case "vmovdqa":
case "vmovdqa8":
case "vmovdqa16":
case "vmovdqa32":
case "vmovdqa64":
case "vmovdqu":
case "vmovdqu8":
case "vmovdqu16":
case "vmovdqu32":
case "vmovdqu64":
case "vmovq":
case "vmovsd":
case "vmovss":
case "vmovupd":
case "vmovups":
instFlags["MovOp"] = true;
break;
}
const instFlagsIndex = instFlagsTable.addIndexed("InstRWFlags(" + CxxUtils.flags(instFlags, (f) => { return `FLAG(${f})`; }, "FLAG(None)") + ")");
const rwInfoIndex = rwInfoTable.addIndexed(`{ ${rData}, ${wData} }`);
inst.additionalInfoIndex = additionaInfoTable.addIndexed(`{ ${instFlagsIndex}, ${rwInfoIndex}, { ${features} } }`);
});
var s = `#define EXT(VAL) uint32_t(CpuFeatures::X86::k##VAL)\n` +
@@ -1811,8 +1851,12 @@ class AdditionalInfoTable extends core.Task {
`\n` +
`#define FLAG(VAL) uint32_t(CpuRWFlags::kX86_##VAL)\n` +
`const InstDB::RWFlagsInfoTable InstDB::_rwFlagsInfoTable[] = {\n${StringUtils.format(rwInfoTable, kIndent, true)}\n};\n` +
`#undef FLAG\n` +
`\n` +
`#define FLAG(VAL) uint32_t(InstRWFlags::k##VAL)\n` +
`const InstRWFlags InstDB::_instFlagsTable[] = {\n${StringUtils.format(instFlagsTable, kIndent, true)}\n};\n` +
`#undef FLAG\n`;
this.inject("AdditionalInfoTable", disclaimer(s), additionaInfoTable.length * 8 + rwInfoTable.length * 8);
this.inject("AdditionalInfoTable", disclaimer(s), additionaInfoTable.length * 8 + rwInfoTable.length * 8 + instFlagsTable.length * 4);
}
rwFlagsOf(dbInsts) {
@@ -2032,6 +2076,7 @@ class InstRWInfoTable extends core.Task {
String(Math.max(rmInfo.memFixed, 0)).padEnd(2),
CxxUtils.flags({
"InstDB::RWInfoRm::kFlagAmbiguous": Boolean(rmInfo.memAmbiguous),
"InstDB::RWInfoRm::kFlagMovssMovsd": Boolean(inst.name === "movss" || inst.name === "movsd"),
"InstDB::RWInfoRm::kFlagPextrw": Boolean(inst.name === "pextrw"),
"InstDB::RWInfoRm::kFlagFeatureIfRMI": Boolean(rmInfo.memExtensionIfRMI)
}),