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[NVPTX] Reduce stack size in NVPTXAsmPrinter::doInitialization(). 

NVPTXAsmPrinter::doInitialization() was creating an NVPTXSubtarget on
the stack.  This object is huge, about 80kb.  Also it's slow to create.
And it's all redundant; we have one in NVPTXTargetMachine anyway!

llvm-svn: 349982
This commit is contained in:
Justin Lebar 2018-12-22 01:30:37 +00:00
parent 9953577cb2
commit 7f41fe3a58
1 changed files with 2 additions and 5 deletions
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7
llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp
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@ -788,11 +788,8 @@ bool NVPTXAsmPrinter::doInitialization(Module &M) {
// Construct a default subtarget off of the TargetMachine defaults. The
// rest of NVPTX isn't friendly to change subtargets per function and
// so the default TargetMachine will have all of the options.
const Triple &TT = TM.getTargetTriple();
StringRef CPU = TM.getTargetCPU();
StringRef FS = TM.getTargetFeatureString();
const NVPTXTargetMachine &NTM = static_cast<const NVPTXTargetMachine &>(TM);
const NVPTXSubtarget STI(TT, CPU, FS, NTM);
const auto* STI = static_cast<const NVPTXSubtarget*>(NTM.getSubtargetImpl());
if (M.alias_size()) {
report_fatal_error("Module has aliases, which NVPTX does not support.");
@ -816,7 +813,7 @@ bool NVPTXAsmPrinter::doInitialization(Module &M) {
bool Result = AsmPrinter::doInitialization(M);
// Emit header before any dwarf directives are emitted below.
emitHeader(M, OS1, STI);
emitHeader(M, OS1, *STI);
OutStreamer->EmitRawText(OS1.str());
// Emit module-level inline asm if it exists.