From d0984565deed74bbf9c17d711c4953ee79efed58 Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Sat, 1 Aug 2009 00:31:02 +0000 Subject: [PATCH] The X86 maximal stack alignment calculator preserves the CFG. Also, be more careful about the return value of runOnMachineFunction. llvm-svn: 77758 --- llvm/lib/Target/X86/X86RegisterInfo.cpp | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/llvm/lib/Target/X86/X86RegisterInfo.cpp b/llvm/lib/Target/X86/X86RegisterInfo.cpp index 864e33b..8c54aeb 100644 --- a/llvm/lib/Target/X86/X86RegisterInfo.cpp +++ b/llvm/lib/Target/X86/X86RegisterInfo.cpp @@ -1451,14 +1451,21 @@ namespace { RegNum < RI.getLastVirtReg(); ++RegNum) MaxAlign = std::max(MaxAlign, RI.getRegClass(RegNum)->getAlignment()); - FFI->setMaxAlignment(MaxAlign); + if (FFI->getMaxAlignment() == MaxAlign) + return false; - return false; + FFI->setMaxAlignment(MaxAlign); + return true; } virtual const char *getPassName() const { return "X86 Maximal Stack Alignment Calculator"; } + + virtual void getAnalysisUsage(AnalysisUsage &AU) const { + AU.setPreservesCFG(); + MachineFunctionPass::getAnalysisUsage(AU); + } }; char MSAC::ID = 0; -- 2.7.4