Index: lib/Target/Mips/MipsInstructionSelector.cpp
===================================================================
--- lib/Target/Mips/MipsInstructionSelector.cpp
+++ lib/Target/Mips/MipsInstructionSelector.cpp
@@ -357,6 +357,16 @@
     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()) {
Index: lib/Target/Mips/MipsLegalizerInfo.cpp
===================================================================
--- lib/Target/Mips/MipsLegalizerInfo.cpp
+++ lib/Target/Mips/MipsLegalizerInfo.cpp
@@ -94,7 +94,7 @@
   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)
Index: lib/Target/Mips/MipsRegisterBankInfo.cpp
===================================================================
--- lib/Target/Mips/MipsRegisterBankInfo.cpp
+++ lib/Target/Mips/MipsRegisterBankInfo.cpp
@@ -133,7 +133,8 @@
   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]
Index: test/CodeGen/Mips/GlobalISel/instruction-select/fabs.mir
===================================================================
--- /dev/null
+++ test/CodeGen/Mips/GlobalISel/instruction-select/fabs.mir
@@ -0,0 +1,65 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -O0 -mtriple=mipsel-linux-gnu -run-pass=instruction-select -verify-machineinstrs %s -o - | FileCheck %s -check-prefixes=FP32
+# RUN: llc -O0 -mtriple=mipsel-linux-gnu -mattr=+fp64,+mips32r2 -run-pass=instruction-select -verify-machineinstrs %s -o - | FileCheck %s -check-prefixes=FP64
+--- |
+
+  define void @fabs_f32() {entry: ret void}
+  define void @fabs_f64() {entry: ret void}
+
+...
+---
+name:            fabs_f32
+alignment:       2
+legalized:       true
+regBankSelected: true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $f12
+
+    ; FP32-LABEL: name: fabs_f32
+    ; FP32: liveins: $f12
+    ; FP32: [[COPY:%[0-9]+]]:fgr32 = COPY $f12
+    ; FP32: [[FABS_S:%[0-9]+]]:fgr32 = FABS_S [[COPY]]
+    ; FP32: $f0 = COPY [[FABS_S]]
+    ; FP32: RetRA implicit $f0
+    ; FP64-LABEL: name: fabs_f32
+    ; FP64: liveins: $f12
+    ; FP64: [[COPY:%[0-9]+]]:fgr32 = COPY $f12
+    ; FP64: [[FABS_S:%[0-9]+]]:fgr32 = FABS_S [[COPY]]
+    ; FP64: $f0 = COPY [[FABS_S]]
+    ; FP64: RetRA implicit $f0
+    %0:fprb(s32) = COPY $f12
+    %1:fprb(s32) = G_FABS %0
+    $f0 = COPY %1(s32)
+    RetRA implicit $f0
+
+...
+---
+name:            fabs_f64
+alignment:       2
+legalized:       true
+regBankSelected: true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $d6
+
+    ; FP32-LABEL: name: fabs_f64
+    ; FP32: liveins: $d6
+    ; FP32: [[COPY:%[0-9]+]]:afgr64 = COPY $d6
+    ; FP32: [[FABS_D32_:%[0-9]+]]:afgr64 = FABS_D32 [[COPY]]
+    ; FP32: $d0 = COPY [[FABS_D32_]]
+    ; FP32: RetRA implicit $d0
+    ; FP64-LABEL: name: fabs_f64
+    ; FP64: liveins: $d6
+    ; FP64: [[COPY:%[0-9]+]]:fgr64 = COPY $d6
+    ; FP64: [[FABS_D64_:%[0-9]+]]:fgr64 = FABS_D64 [[COPY]]
+    ; FP64: $d0 = COPY [[FABS_D64_]]
+    ; FP64: RetRA implicit $d0
+    %0:fprb(s64) = COPY $d6
+    %1:fprb(s64) = G_FABS %0
+    $d0 = COPY %1(s64)
+    RetRA implicit $d0
+
+...
Index: test/CodeGen/Mips/GlobalISel/legalizer/fabs.mir
===================================================================
--- /dev/null
+++ test/CodeGen/Mips/GlobalISel/legalizer/fabs.mir
@@ -0,0 +1,61 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -O0 -mtriple=mipsel-linux-gnu -run-pass=legalizer -verify-machineinstrs %s -o - | FileCheck %s -check-prefixes=FP32
+# RUN: llc -O0 -mtriple=mipsel-linux-gnu -mattr=+fp64,+mips32r2 -run-pass=legalizer -verify-machineinstrs %s -o - | FileCheck %s -check-prefixes=FP64
+--- |
+
+  define void @fabs_f32() {entry: ret void}
+  define void @fabs_f64() {entry: ret void}
+
+...
+---
+name:            fabs_f32
+alignment:       2
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $f12
+
+    ; FP32-LABEL: name: fabs_f32
+    ; FP32: liveins: $f12
+    ; FP32: [[COPY:%[0-9]+]]:_(s32) = COPY $f12
+    ; FP32: [[FABS:%[0-9]+]]:_(s32) = G_FABS [[COPY]]
+    ; FP32: $f0 = COPY [[FABS]](s32)
+    ; FP32: RetRA implicit $f0
+    ; FP64-LABEL: name: fabs_f32
+    ; FP64: liveins: $f12
+    ; FP64: [[COPY:%[0-9]+]]:_(s32) = COPY $f12
+    ; FP64: [[FABS:%[0-9]+]]:_(s32) = G_FABS [[COPY]]
+    ; FP64: $f0 = COPY [[FABS]](s32)
+    ; FP64: RetRA implicit $f0
+    %0:_(s32) = COPY $f12
+    %1:_(s32) = G_FABS %0
+    $f0 = COPY %1(s32)
+    RetRA implicit $f0
+
+...
+---
+name:            fabs_f64
+alignment:       2
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $d6
+
+    ; FP32-LABEL: name: fabs_f64
+    ; FP32: liveins: $d6
+    ; FP32: [[COPY:%[0-9]+]]:_(s64) = COPY $d6
+    ; FP32: [[FABS:%[0-9]+]]:_(s64) = G_FABS [[COPY]]
+    ; FP32: $d0 = COPY [[FABS]](s64)
+    ; FP32: RetRA implicit $d0
+    ; FP64-LABEL: name: fabs_f64
+    ; FP64: liveins: $d6
+    ; FP64: [[COPY:%[0-9]+]]:_(s64) = COPY $d6
+    ; FP64: [[FABS:%[0-9]+]]:_(s64) = G_FABS [[COPY]]
+    ; FP64: $d0 = COPY [[FABS]](s64)
+    ; FP64: RetRA implicit $d0
+    %0:_(s64) = COPY $d6
+    %1:_(s64) = G_FABS %0
+    $d0 = COPY %1(s64)
+    RetRA implicit $d0
+
+...
Index: test/CodeGen/Mips/GlobalISel/llvm-ir/fabs.ll
===================================================================
--- /dev/null
+++ test/CodeGen/Mips/GlobalISel/llvm-ir/fabs.ll
@@ -0,0 +1,27 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc  -O0 -mtriple=mipsel-linux-gnu -global-isel -verify-machineinstrs %s -o -| FileCheck %s -check-prefixes=MIPS32,FP32
+; RUN: llc  -O0 -mtriple=mipsel-linux-gnu -mattr=+fp64,+mips32r2 -global-isel -verify-machineinstrs %s -o -| FileCheck %s -check-prefixes=MIPS32,FP64
+
+declare float @llvm.fabs.f32(float)
+define float @fabs_f32(float %a) {
+; MIPS32-LABEL: fabs_f32:
+; MIPS32:       # %bb.0: # %entry
+; MIPS32-NEXT:    abs.s $f0, $f12
+; MIPS32-NEXT:    jr $ra
+; MIPS32-NEXT:    nop
+entry:
+  %0 = call float @llvm.fabs.f32(float %a)
+  ret float %0
+}
+
+declare double @llvm.fabs.f64(double)
+define double @fabs_f64(double %a) {
+; MIPS32-LABEL: fabs_f64:
+; MIPS32:       # %bb.0: # %entry
+; MIPS32-NEXT:    abs.d $f0, $f12
+; MIPS32-NEXT:    jr $ra
+; MIPS32-NEXT:    nop
+entry:
+  %0 = call double @llvm.fabs.f64(double %a)
+  ret double %0
+}
Index: test/CodeGen/Mips/GlobalISel/regbankselect/fabs.mir
===================================================================
--- /dev/null
+++ test/CodeGen/Mips/GlobalISel/regbankselect/fabs.mir
@@ -0,0 +1,63 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -O0 -mtriple=mipsel-linux-gnu -run-pass=regbankselect -verify-machineinstrs %s -o - | FileCheck %s -check-prefixes=FP32
+# RUN: llc -O0 -mtriple=mipsel-linux-gnu -mattr=+fp64,+mips32r2 -run-pass=regbankselect -verify-machineinstrs %s -o - | FileCheck %s -check-prefixes=FP64
+--- |
+
+  define void @fabs_f32() {entry: ret void}
+  define void @fabs_f64() {entry: ret void}
+
+...
+---
+name:            fabs_f32
+alignment:       2
+legalized:       true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $f12
+
+    ; FP32-LABEL: name: fabs_f32
+    ; FP32: liveins: $f12
+    ; FP32: [[COPY:%[0-9]+]]:fprb(s32) = COPY $f12
+    ; FP32: [[FABS:%[0-9]+]]:fprb(s32) = G_FABS [[COPY]]
+    ; FP32: $f0 = COPY [[FABS]](s32)
+    ; FP32: RetRA implicit $f0
+    ; FP64-LABEL: name: fabs_f32
+    ; FP64: liveins: $f12
+    ; FP64: [[COPY:%[0-9]+]]:fprb(s32) = COPY $f12
+    ; FP64: [[FABS:%[0-9]+]]:fprb(s32) = G_FABS [[COPY]]
+    ; FP64: $f0 = COPY [[FABS]](s32)
+    ; FP64: RetRA implicit $f0
+    %0:_(s32) = COPY $f12
+    %1:_(s32) = G_FABS %0
+    $f0 = COPY %1(s32)
+    RetRA implicit $f0
+
+...
+---
+name:            fabs_f64
+alignment:       2
+legalized:       true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $d6
+
+    ; FP32-LABEL: name: fabs_f64
+    ; FP32: liveins: $d6
+    ; FP32: [[COPY:%[0-9]+]]:fprb(s64) = COPY $d6
+    ; FP32: [[FABS:%[0-9]+]]:fprb(s64) = G_FABS [[COPY]]
+    ; FP32: $d0 = COPY [[FABS]](s64)
+    ; FP32: RetRA implicit $d0
+    ; FP64-LABEL: name: fabs_f64
+    ; FP64: liveins: $d6
+    ; FP64: [[COPY:%[0-9]+]]:fprb(s64) = COPY $d6
+    ; FP64: [[FABS:%[0-9]+]]:fprb(s64) = G_FABS [[COPY]]
+    ; FP64: $d0 = COPY [[FABS]](s64)
+    ; FP64: RetRA implicit $d0
+    %0:_(s64) = COPY $d6
+    %1:_(s64) = G_FABS %0
+    $d0 = COPY %1(s64)
+    RetRA implicit $d0
+
+...