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Allow targets to opt-in to codegen in SCC order 

Decouple this setting from EnableIRPA.

To support function calls on AMDGPU, it is necessary to
report the global register usage throughout the kernel's
call graph, so callees need to be handled first.

llvm-svn: 299487
This commit is contained in:
Matt Arsenault 2017-04-04 23:44:46 +00:00
parent e33bc31df4
commit 7b0d947404
2 changed files with 15 additions and 2 deletions
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9
llvm/include/llvm/CodeGen/TargetPassConfig.h
View File

@ -115,6 +115,10 @@ protected:
/// Default setting for -enable-tail-merge on this target.
bool EnableTailMerge;
/// Require processing of functions such that callees are generated before
/// callers.
bool RequireCodeGenSCCOrder;
public:
TargetPassConfig(TargetMachine *tm, PassManagerBase &pm);
// Dummy constructor.
@ -162,6 +166,11 @@ public:
bool getEnableTailMerge() const { return EnableTailMerge; }
void setEnableTailMerge(bool Enable) { setOpt(EnableTailMerge, Enable); }
bool requiresCodeGenSCCOrder() const { return RequireCodeGenSCCOrder; }
void setRequiresCodeGenSCCOrder(bool Enable = true) {
setOpt(RequireCodeGenSCCOrder, Enable);
}
/// Allow the target to override a specific pass without overriding the pass
/// pipeline. When passes are added to the standard pipeline at the
/// point where StandardID is expected, add TargetID in its place.

8
llvm/lib/CodeGen/TargetPassConfig.cpp
View File

@ -264,7 +264,8 @@ TargetPassConfig::~TargetPassConfig() {
TargetPassConfig::TargetPassConfig(TargetMachine *tm, PassManagerBase &pm)
: ImmutablePass(ID), PM(&pm), Started(true), Stopped(false),
AddingMachinePasses(false), TM(tm), Impl(nullptr), Initialized(false),
DisableVerify(false), EnableTailMerge(true) {
DisableVerify(false), EnableTailMerge(true),
RequireCodeGenSCCOrder(false) {
Impl = new PassConfigImpl();
@ -282,6 +283,9 @@ TargetPassConfig::TargetPassConfig(TargetMachine *tm, PassManagerBase &pm)
if (StringRef(PrintMachineInstrs.getValue()).equals(""))
TM->Options.PrintMachineCode = true;
if (TM->Options.EnableIPRA)
setRequiresCodeGenSCCOrder();
}
CodeGenOpt::Level TargetPassConfig::getOptLevel() const {
@ -534,7 +538,7 @@ void TargetPassConfig::addISelPrepare() {
addPreISel();
// Force codegen to run according to the callgraph.
if (TM->Options.EnableIPRA)
if (requiresCodeGenSCCOrder())
addPass(new DummyCGSCCPass);
// Add both the safe stack and the stack protection passes: each of them will