diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/AArch64/AArch64FastISel.cpp | 39 |
1 files changed, 33 insertions, 6 deletions
diff --git a/llvm/lib/Target/AArch64/AArch64FastISel.cpp b/llvm/lib/Target/AArch64/AArch64FastISel.cpp index 4d18a4e0b0f..eaa89b22628 100644 --- a/llvm/lib/Target/AArch64/AArch64FastISel.cpp +++ b/llvm/lib/Target/AArch64/AArch64FastISel.cpp @@ -3899,6 +3899,17 @@ unsigned AArch64FastISel::emitLSL_ri(MVT RetVT, MVT SrcVT, unsigned Op0, unsigned RegSize = Is64Bit ? 64 : 32; unsigned DstBits = RetVT.getSizeInBits(); unsigned SrcBits = SrcVT.getSizeInBits(); + const TargetRegisterClass *RC = + Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass; + + // Just emit a copy for "zero" shifts. + if (Shift == 0) { + unsigned ResultReg = createResultReg(RC); + BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, + TII.get(TargetOpcode::COPY), ResultReg) + .addReg(Op0, getKillRegState(Op0IsKill)); + return ResultReg; + } // Don't deal with undefined shifts. if (Shift >= DstBits) @@ -3937,8 +3948,6 @@ unsigned AArch64FastISel::emitLSL_ri(MVT RetVT, MVT SrcVT, unsigned Op0, {AArch64::UBFMWri, AArch64::UBFMXri} }; unsigned Opc = OpcTable[IsZext][Is64Bit]; - const TargetRegisterClass *RC = - Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass; if (SrcVT.SimpleTy <= MVT::i32 && RetVT == MVT::i64) { unsigned TmpReg = MRI.createVirtualRegister(RC); BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, @@ -3993,6 +4002,17 @@ unsigned AArch64FastISel::emitLSR_ri(MVT RetVT, MVT SrcVT, unsigned Op0, unsigned RegSize = Is64Bit ? 64 : 32; unsigned DstBits = RetVT.getSizeInBits(); unsigned SrcBits = SrcVT.getSizeInBits(); + const TargetRegisterClass *RC = + Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass; + + // Just emit a copy for "zero" shifts. + if (Shift == 0) { + unsigned ResultReg = createResultReg(RC); + BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, + TII.get(TargetOpcode::COPY), ResultReg) + .addReg(Op0, getKillRegState(Op0IsKill)); + return ResultReg; + } // Don't deal with undefined shifts. if (Shift >= DstBits) @@ -4045,8 +4065,6 @@ unsigned AArch64FastISel::emitLSR_ri(MVT RetVT, MVT SrcVT, unsigned Op0, {AArch64::UBFMWri, AArch64::UBFMXri} }; unsigned Opc = OpcTable[IsZExt][Is64Bit]; - const TargetRegisterClass *RC = - Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass; if (SrcVT.SimpleTy <= MVT::i32 && RetVT == MVT::i64) { unsigned TmpReg = MRI.createVirtualRegister(RC); BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, @@ -4101,6 +4119,17 @@ unsigned AArch64FastISel::emitASR_ri(MVT RetVT, MVT SrcVT, unsigned Op0, unsigned RegSize = Is64Bit ? 64 : 32; unsigned DstBits = RetVT.getSizeInBits(); unsigned SrcBits = SrcVT.getSizeInBits(); + const TargetRegisterClass *RC = + Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass; + + // Just emit a copy for "zero" shifts. + if (Shift == 0) { + unsigned ResultReg = createResultReg(RC); + BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, + TII.get(TargetOpcode::COPY), ResultReg) + .addReg(Op0, getKillRegState(Op0IsKill)); + return ResultReg; + } // Don't deal with undefined shifts. if (Shift >= DstBits) @@ -4141,8 +4170,6 @@ unsigned AArch64FastISel::emitASR_ri(MVT RetVT, MVT SrcVT, unsigned Op0, {AArch64::UBFMWri, AArch64::UBFMXri} }; unsigned Opc = OpcTable[IsZExt][Is64Bit]; - const TargetRegisterClass *RC = - Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass; if (SrcVT.SimpleTy <= MVT::i32 && RetVT == MVT::i64) { unsigned TmpReg = MRI.createVirtualRegister(RC); BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, |
