diff options
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp index 26c25ba26d4..4622248102e 100644 --- a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp +++ b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp @@ -633,6 +633,21 @@ LegalizerHelper::LegalizeResult LegalizerHelper::narrowScalar(MachineInstr &MI, MI.eraseFromParent(); return Legalized; } + case TargetOpcode::G_TRUNC: { + if (TypeIdx != 1) + return UnableToLegalize; + + uint64_t SizeOp1 = MRI.getType(MI.getOperand(1).getReg()).getSizeInBits(); + if (NarrowTy.getSizeInBits() * 2 != SizeOp1) { + LLVM_DEBUG(dbgs() << "Can't narrow trunc to type " << NarrowTy << "\n"); + return UnableToLegalize; + } + + auto Unmerge = MIRBuilder.buildUnmerge(NarrowTy, MI.getOperand(1).getReg()); + MIRBuilder.buildCopy(MI.getOperand(0).getReg(), Unmerge.getReg(0)); + MI.eraseFromParent(); + return Legalized; + } case TargetOpcode::G_ADD: { // FIXME: add support for when SizeOp0 isn't an exact multiple of |
