diff options
Diffstat (limited to 'llvm/lib/Target/WebAssembly/WebAssemblyExplicitLocals.cpp')
| -rw-r--r-- | llvm/lib/Target/WebAssembly/WebAssemblyExplicitLocals.cpp | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyExplicitLocals.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyExplicitLocals.cpp index 2662241e..e6486e2 100644 --- a/llvm/lib/Target/WebAssembly/WebAssemblyExplicitLocals.cpp +++ b/llvm/lib/Target/WebAssembly/WebAssemblyExplicitLocals.cpp @@ -256,9 +256,17 @@ bool WebAssemblyExplicitLocals::runOnMachineFunction(MachineFunction &MF) { // Precompute the set of registers that are unused, so that we can insert // drops to their defs. + // And unstackify any stackified registers that don't have any uses, so that + // they can be dropped later. This can happen when transformations after + // RegStackify remove instructions using stackified registers. BitVector UseEmpty(MRI.getNumVirtRegs()); - for (unsigned I = 0, E = MRI.getNumVirtRegs(); I < E; ++I) - UseEmpty[I] = MRI.use_empty(Register::index2VirtReg(I)); + for (unsigned I = 0, E = MRI.getNumVirtRegs(); I < E; ++I) { + Register Reg = Register::index2VirtReg(I); + if (MRI.use_empty(Reg)) { + UseEmpty[I] = true; + MFI.unstackifyVReg(Reg); + } + } // Visit each instruction in the function. for (MachineBasicBlock &MBB : MF) { |