diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/FastISel.cpp | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp index 2b624adac94..13f0cb3900f 100644 --- a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp @@ -1675,6 +1675,7 @@ unsigned FastISel::fastEmit_ri_(MVT VT, unsigned Opcode, unsigned Op0, if (ResultReg) return ResultReg; unsigned MaterialReg = fastEmit_i(ImmType, ImmType, ISD::Constant, Imm); + bool IsImmKill = true; if (!MaterialReg) { // This is a bit ugly/slow, but failing here means falling out of // fast-isel, which would be very slow. @@ -1683,9 +1684,12 @@ unsigned FastISel::fastEmit_ri_(MVT VT, unsigned Opcode, unsigned Op0, MaterialReg = getRegForValue(ConstantInt::get(ITy, Imm)); if (!MaterialReg) return 0; + // If this constant was already materialized, then we don't want to kill it. + // In this case we will have a use. + if (!MRI.use_empty(MaterialReg)) + IsImmKill = false; } - return fastEmit_rr(VT, VT, Opcode, Op0, Op0IsKill, MaterialReg, - /*IsKill=*/true); + return fastEmit_rr(VT, VT, Opcode, Op0, Op0IsKill, MaterialReg, IsImmKill); } unsigned FastISel::createResultReg(const TargetRegisterClass *RC) { |
