[clang] [llvm] [AMDGPU] Convert AMDGPUResourceUsageAnalysis pass from Module to MF pass (PR #102913)
Janek van Oirschot via cfe-commits
cfe-commits at lists.llvm.org
Thu Aug 29 05:49:15 PDT 2024
================
@@ -0,0 +1,225 @@
+//===- AMDGPUMCResourceInfo.cpp --- MC Resource Info ----------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file
+/// \brief MC infrastructure to propagate the function level resource usage
+/// info.
+///
+//===----------------------------------------------------------------------===//
+
+#include "AMDGPUMCResourceInfo.h"
+#include "Utils/AMDGPUBaseInfo.h"
+#include "llvm/ADT/SmallSet.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCSymbol.h"
+
+using namespace llvm;
+
+MCSymbol *MCResourceInfo::getSymbol(StringRef FuncName, ResourceInfoKind RIK,
+ MCContext &OutContext) {
+ auto GOCS = [this, FuncName, &OutContext](StringRef Suffix) {
+ return OutContext.getOrCreateSymbol(FuncName + Twine(Suffix));
+ };
+ switch (RIK) {
+ case RIK_NumVGPR:
+ return GOCS(".num_vgpr");
+ case RIK_NumAGPR:
+ return GOCS(".num_agpr");
+ case RIK_NumSGPR:
+ return GOCS(".numbered_sgpr");
+ case RIK_PrivateSegSize:
+ return GOCS(".private_seg_size");
+ case RIK_UsesVCC:
+ return GOCS(".uses_vcc");
+ case RIK_UsesFlatScratch:
+ return GOCS(".uses_flat_scratch");
+ case RIK_HasDynSizedStack:
+ return GOCS(".has_dyn_sized_stack");
+ case RIK_HasRecursion:
+ return GOCS(".has_recursion");
+ case RIK_HasIndirectCall:
+ return GOCS(".has_indirect_call");
+ }
+ llvm_unreachable("Unexpected ResourceInfoKind.");
+}
+
+const MCExpr *MCResourceInfo::getSymRefExpr(StringRef FuncName,
+ ResourceInfoKind RIK,
+ MCContext &Ctx) {
+ return MCSymbolRefExpr::create(getSymbol(FuncName, RIK, Ctx), Ctx);
+}
+
+void MCResourceInfo::assignMaxRegs(MCContext &OutContext) {
+ // Assign expression to get the max register use to the max_num_Xgpr symbol.
+ MCSymbol *MaxVGPRSym = getMaxVGPRSymbol(OutContext);
+ MCSymbol *MaxAGPRSym = getMaxAGPRSymbol(OutContext);
+ MCSymbol *MaxSGPRSym = getMaxSGPRSymbol(OutContext);
+
+ auto assignMaxRegSym = [this, &OutContext](MCSymbol *Sym, int32_t RegCount) {
+ const MCExpr *MaxExpr = MCConstantExpr::create(RegCount, OutContext);
+ Sym->setVariableValue(MaxExpr);
+ };
+
+ assignMaxRegSym(MaxVGPRSym, MaxVGPR);
+ assignMaxRegSym(MaxAGPRSym, MaxAGPR);
+ assignMaxRegSym(MaxSGPRSym, MaxSGPR);
+}
+
+void MCResourceInfo::finalize(MCContext &OutContext) {
+ assert(!Finalized && "Cannot finalize ResourceInfo again.");
+ Finalized = true;
+ assignMaxRegs(OutContext);
+}
+
+MCSymbol *MCResourceInfo::getMaxVGPRSymbol(MCContext &OutContext) {
+ return OutContext.getOrCreateSymbol("max_num_vgpr");
+}
+
+MCSymbol *MCResourceInfo::getMaxAGPRSymbol(MCContext &OutContext) {
+ return OutContext.getOrCreateSymbol("max_num_agpr");
+}
+
+MCSymbol *MCResourceInfo::getMaxSGPRSymbol(MCContext &OutContext) {
+ return OutContext.getOrCreateSymbol("max_num_sgpr");
+}
----------------
JanekvO wrote:
I haven't convinced myself of the naming/approach I've used here. These are module scope maxima but every module is going to re-defined these for their own scope.
https://github.com/llvm/llvm-project/pull/102913
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