diff options
Diffstat (limited to 'llvm/lib/CodeGen/LiveDebugVariables.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/LiveDebugVariables.cpp | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/LiveDebugVariables.cpp b/llvm/lib/CodeGen/LiveDebugVariables.cpp index ce350b7..320e682 100644 --- a/llvm/lib/CodeGen/LiveDebugVariables.cpp +++ b/llvm/lib/CodeGen/LiveDebugVariables.cpp @@ -1850,16 +1850,33 @@ void LDVImpl::emitDebugValues(VirtRegMap *VRM) { const TargetRegisterClass *TRC = MRI.getRegClass(Reg); unsigned SpillSize, SpillOffset; - // Test whether this location is legal with the given subreg. + unsigned regSizeInBits = TRI->getRegSizeInBits(*TRC); + if (SubReg) + regSizeInBits = TRI->getSubRegIdxSize(SubReg); + + // Test whether this location is legal with the given subreg. If the + // subregister has a nonzero offset, drop this location, it's too complex + // to describe. (TODO: future work). bool Success = TII->getStackSlotRange(TRC, SubReg, SpillSize, SpillOffset, *MF); - if (Success) { + if (Success && SpillOffset == 0) { auto Builder = BuildMI(*OrigMBB, OrigMBB->begin(), DebugLoc(), TII->get(TargetOpcode::DBG_PHI)); Builder.addFrameIndex(VRM->getStackSlot(Reg)); Builder.addImm(InstNum); + // Record how large the original value is. The stack slot might be + // merged and altered during optimisation, but we will want to know how + // large the value is, at this DBG_PHI. + Builder.addImm(regSizeInBits); + } + + LLVM_DEBUG( + if (SpillOffset != 0) { + dbgs() << "DBG_PHI for Vreg " << Reg << " subreg " << SubReg << + " has nonzero offset\n"; } + ); } // If there was no mapping for a value ID, it's optimized out. Create no // DBG_PHI, and any variables using this value will become optimized out. |