diff options
Diffstat (limited to 'llvm/lib/Target/SystemZ')
| -rw-r--r-- | llvm/lib/Target/SystemZ/SystemZInstrFP.td | 4 | ||||
| -rw-r--r-- | llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp | 3 |
2 files changed, 6 insertions, 1 deletions
diff --git a/llvm/lib/Target/SystemZ/SystemZInstrFP.td b/llvm/lib/Target/SystemZ/SystemZInstrFP.td index 0cb267290cc..82dccd3878b 100644 --- a/llvm/lib/Target/SystemZ/SystemZInstrFP.td +++ b/llvm/lib/Target/SystemZ/SystemZInstrFP.td @@ -37,6 +37,10 @@ let hasSideEffects = 0 in { def LER : UnaryRR <"le", 0x38, null_frag, FP32, FP32>; def LDR : UnaryRR <"ld", 0x28, null_frag, FP64, FP64>; def LXR : UnaryRRE<"lx", 0xB365, null_frag, FP128, FP128>; + + // For z13 we prefer LDR over LER to avoid partial register dependencies. + let isCodeGenOnly = 1 in + def LDR32 : UnaryRR<"ld", 0x28, null_frag, FP32, FP32>; } // Moves between two floating-point registers that also set the condition diff --git a/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp b/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp index 39c43739e1c..8dadd017770 100644 --- a/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp +++ b/llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp @@ -572,7 +572,8 @@ void SystemZInstrInfo::copyPhysReg(MachineBasicBlock &MBB, if (SystemZ::GR64BitRegClass.contains(DestReg, SrcReg)) Opcode = SystemZ::LGR; else if (SystemZ::FP32BitRegClass.contains(DestReg, SrcReg)) - Opcode = SystemZ::LER; + // For z13 we prefer LDR over LER to avoid partial register dependencies. + Opcode = STI.hasVector() ? SystemZ::LDR32 : SystemZ::LER; else if (SystemZ::FP64BitRegClass.contains(DestReg, SrcReg)) Opcode = SystemZ::LDR; else if (SystemZ::FP128BitRegClass.contains(DestReg, SrcReg)) |
