diff options
author | Dimitry Andric <dim@FreeBSD.org> | 2020-07-26 19:36:28 +0000 |
---|---|---|
committer | Dimitry Andric <dim@FreeBSD.org> | 2020-07-26 19:36:28 +0000 |
commit | cfca06d7963fa0909f90483b42a6d7d194d01e08 (patch) | |
tree | 209fb2a2d68f8f277793fc8df46c753d31bc853b /llvm/lib/Target/WebAssembly/WebAssemblyOptimizeLiveIntervals.cpp | |
parent | 706b4fc47bbc608932d3b491ae19a3b9cde9497b (diff) |
Notes
Diffstat (limited to 'llvm/lib/Target/WebAssembly/WebAssemblyOptimizeLiveIntervals.cpp')
-rw-r--r-- | llvm/lib/Target/WebAssembly/WebAssemblyOptimizeLiveIntervals.cpp | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyOptimizeLiveIntervals.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyOptimizeLiveIntervals.cpp index 0bd30791e57c..a2da0ea849e0 100644 --- a/llvm/lib/Target/WebAssembly/WebAssemblyOptimizeLiveIntervals.cpp +++ b/llvm/lib/Target/WebAssembly/WebAssemblyOptimizeLiveIntervals.cpp @@ -20,6 +20,7 @@ //===----------------------------------------------------------------------===// #include "WebAssembly.h" +#include "WebAssemblyMachineFunctionInfo.h" #include "WebAssemblySubtarget.h" #include "llvm/CodeGen/LiveIntervals.h" #include "llvm/CodeGen/MachineBlockFrequencyInfo.h" @@ -82,10 +83,22 @@ bool WebAssemblyOptimizeLiveIntervals::runOnMachineFunction( SmallVector<LiveInterval *, 4> SplitLIs; for (unsigned I = 0, E = MRI.getNumVirtRegs(); I < E; ++I) { unsigned Reg = Register::index2VirtReg(I); + auto &TRI = *MF.getSubtarget<WebAssemblySubtarget>().getRegisterInfo(); + if (MRI.reg_nodbg_empty(Reg)) continue; LIS.splitSeparateComponents(LIS.getInterval(Reg), SplitLIs); + if (Reg == TRI.getFrameRegister(MF) && SplitLIs.size() > 0) { + // The live interval for the frame register was split, resulting in a new + // VReg. For now we only support debug info output for a single frame base + // value for the function, so just use the last one. It will certainly be + // wrong for some part of the function, but until we are able to track + // values through live-range splitting and stackification, it will have to + // do. + MF.getInfo<WebAssemblyFunctionInfo>()->setFrameBaseVreg( + SplitLIs.back()->reg); + } SplitLIs.clear(); } @@ -103,5 +116,5 @@ bool WebAssemblyOptimizeLiveIntervals::runOnMachineFunction( } } - return false; + return true; } |