[MIPS GlobalISel] Select fabs

Select G_FABS for MIPS32.

Differential Revision: https://reviews.llvm.org/D62903

llvm-svn: 362690

3 files changed, 13 insertions, 2 deletions

diff --git a/llvm/lib/Target/Mips/MipsInstructionSelector.cpp b/llvm/lib/Target/Mips/MipsInstructionSelector.cpp
index 8fddcca4cfe..ea9b2e51557 100644
--- a/llvm/lib/Target/Mips/MipsInstructionSelector.cpp
+++ b/llvm/lib/Target/Mips/MipsInstructionSelector.cpp
@@ -357,6 +357,16 @@ bool MipsInstructionSelector::select(MachineInstr &I,
     I.eraseFromParent();
     return true;
   }
+  case G_FABS: {
+    unsigned Size = MRI.getType(I.getOperand(0).getReg()).getSizeInBits();
+    unsigned FABSOpcode =
+        Size == 32 ? Mips::FABS_S
+                   : STI.isFP64bit() ? Mips::FABS_D64 : Mips::FABS_D32;
+    MI = BuildMI(MBB, I, I.getDebugLoc(), TII.get(FABSOpcode))
+             .add(I.getOperand(0))
+             .add(I.getOperand(1));
+    break;
+  }
   case G_GLOBAL_VALUE: {
     const llvm::GlobalValue *GVal = I.getOperand(1).getGlobal();
     if (MF.getTarget().isPositionIndependent()) {
diff --git a/llvm/lib/Target/Mips/MipsLegalizerInfo.cpp b/llvm/lib/Target/Mips/MipsLegalizerInfo.cpp
index 146ee754183..9161a0fb38b 100644
--- a/llvm/lib/Target/Mips/MipsLegalizerInfo.cpp
+++ b/llvm/lib/Target/Mips/MipsLegalizerInfo.cpp
@@ -94,7 +94,7 @@ MipsLegalizerInfo::MipsLegalizerInfo(const MipsSubtarget &ST) {
   getActionDefinitionsBuilder(G_FCONSTANT)
       .legalFor({s32, s64});
 
-  getActionDefinitionsBuilder({G_FADD, G_FSUB, G_FMUL, G_FDIV})
+  getActionDefinitionsBuilder({G_FADD, G_FSUB, G_FMUL, G_FDIV, G_FABS})
       .legalFor({s32, s64});
 
   getActionDefinitionsBuilder(G_FCMP)
diff --git a/llvm/lib/Target/Mips/MipsRegisterBankInfo.cpp b/llvm/lib/Target/Mips/MipsRegisterBankInfo.cpp
index 6a4ffe16a35..3ac81f74c62 100644
--- a/llvm/lib/Target/Mips/MipsRegisterBankInfo.cpp
+++ b/llvm/lib/Target/Mips/MipsRegisterBankInfo.cpp
@@ -133,7 +133,8 @@ MipsRegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
   case G_FADD:
   case G_FSUB:
   case G_FMUL:
-  case G_FDIV: {
+  case G_FDIV:
+  case G_FABS: {
     unsigned Size = MRI.getType(MI.getOperand(0).getReg()).getSizeInBits();
     assert((Size == 32 || Size == 64) && "Unsupported floating point size");
     OperandsMapping = Size == 32 ? &Mips::ValueMappings[Mips::SPRIdx]