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[NVPTX] Add Volta Load/Store Atomics (.relaxed, .acquire, .release) and Volatile (.mmio/.volatile) support #98022

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merged 7 commits into from
Jul 15, 2024
+1,848 −157
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[NVPTX] Add Volta Load/Store Atomics (.relaxed, .acquire, .release) and Volatile (.mmio/.volatile) support #98022

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9487b09
[NVPTX] Volta Relaxed/Acquire/Release and Volatile Load/Store Ops
gonzalobg Jul 9, 2024
5584b35
[NVPTX] Move atomics and MMIO detection to NVPTXSubtarget
gonzalobg Jul 11, 2024
069c694
[NVPTX]: Remove redundant check and fix capitalization
gonzalobg Jul 11, 2024
d6d7c19
[NVPTX] Use ptxas-12.2 for new tests
gonzalobg Jul 11, 2024
08a16c1
[NVPTX] Improve comments
gonzalobg Jul 11, 2024
54a9806
[NVPTX] Add missing -arch to ptxas test invocation
gonzalobg Jul 12, 2024
46ab54a
[NVPTX] Fix comment typos
gonzalobg Jul 12, 2024
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28 changes: 26 additions & 2 deletions llvm/lib/Target/NVPTX/MCTargetDesc/NVPTXInstPrinter.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -227,9 +227,33 @@ void NVPTXInstPrinter::printLdStCode(const MCInst *MI, int OpNum,
if (Modifier) {
const MCOperand &MO = MI->getOperand(OpNum);
int Imm = (int) MO.getImm();
if (!strcmp(Modifier, "volatile")) {
if (Imm)
if (!strcmp(Modifier, "sem")) {
switch (Imm) {
case NVPTX::PTXLdStInstCode::NotAtomic:
break;
case NVPTX::PTXLdStInstCode::Volatile:
O << ".volatile";
break;
case NVPTX::PTXLdStInstCode::Relaxed:
O << ".relaxed.sys";
break;
case NVPTX::PTXLdStInstCode::Acquire:
O << ".acquire.sys";
break;
case NVPTX::PTXLdStInstCode::Release:
O << ".release.sys";
break;
case NVPTX::PTXLdStInstCode::RelaxedMMIO:
O << ".mmio.relaxed.sys";
break;
default:
SmallString<256> Msg;
raw_svector_ostream OS(Msg);
OS << "NVPTX LdStCode Printer does not support \"" << Imm
<< "\" sem modifier.";
report_fatal_error(OS.str());
break;
}
} else if (!strcmp(Modifier, "addsp")) {
switch (Imm) {
case NVPTX::PTXLdStInstCode::GLOBAL:
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8 changes: 8 additions & 0 deletions llvm/lib/Target/NVPTX/NVPTX.h
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Original file line number Diff line number Diff line change
Expand Up @@ -107,6 +107,14 @@ enum LoadStore {
};

namespace PTXLdStInstCode {
enum MemorySemantic {
NotAtomic = 0, // PTX calls these: "Weak"
Volatile = 1,
Relaxed = 2,
Acquire = 3,
Release = 4,
RelaxedMMIO = 5
};
enum AddressSpace {
GENERIC = 0,
GLOBAL = 1,
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