Index: include/llvm/Target/GenericOpcodes.td
===================================================================
--- include/llvm/Target/GenericOpcodes.td
+++ include/llvm/Target/GenericOpcodes.td
@@ -429,6 +429,21 @@
   let InOperandList = (ins type0:$src1);
   let hasSideEffects = 0;
 }
+
+// Floating point base-2 logarithm of a value.
+def G_FLOG : Instruction {
+  let OutOperandList = (outs type0:$dst);
+  let InOperandList = (ins type0:$src1);
+  let hasSideEffects = 0;
+}
+
+// Floating point base-2 logarithm of a value.
+def G_FLOG2 : Instruction {
+  let OutOperandList = (outs type0:$dst);
+  let InOperandList = (ins type0:$src1);
+  let hasSideEffects = 0;
+}
+
 //------------------------------------------------------------------------------
 // Memory ops
 //------------------------------------------------------------------------------
Index: include/llvm/Target/GlobalISel/SelectionDAGCompat.td
===================================================================
--- include/llvm/Target/GlobalISel/SelectionDAGCompat.td
+++ include/llvm/Target/GlobalISel/SelectionDAGCompat.td
@@ -63,6 +63,7 @@
 def : GINodeEquiv<G_FREM, frem>;
 def : GINodeEquiv<G_FPOW, fpow>;
 def : GINodeEquiv<G_FEXP2, fexp2>;
+def : GINodeEquiv<G_FLOG2, flog2>;
 def : GINodeEquiv<G_BR, br>;
 
 // Specifies the GlobalISel equivalents for SelectionDAG's ComplexPattern.
Index: include/llvm/Target/TargetOpcodes.def
===================================================================
--- include/llvm/Target/TargetOpcodes.def
+++ include/llvm/Target/TargetOpcodes.def
@@ -375,6 +375,12 @@
 /// Generic base-2 exponential of a value.
 HANDLE_TARGET_OPCODE(G_FEXP2)
 
+/// Floating point base-e logarithm of a value.
+HANDLE_TARGET_OPCODE(G_FLOG)
+
+/// Floating point base-2 logarithm of a value.
+HANDLE_TARGET_OPCODE(G_FLOG2)
+
 /// Generic FP negation.
 HANDLE_TARGET_OPCODE(G_FNEG)
 
Index: lib/CodeGen/GlobalISel/IRTranslator.cpp
===================================================================
--- lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -730,6 +730,16 @@
         .addDef(getOrCreateVReg(CI))
         .addUse(getOrCreateVReg(*CI.getArgOperand(0)));
     return true;
+  case Intrinsic::log:
+    MIRBuilder.buildInstr(TargetOpcode::G_FLOG)
+        .addDef(getOrCreateVReg(CI))
+        .addUse(getOrCreateVReg(*CI.getArgOperand(0)));
+    return true;
+  case Intrinsic::log2:
+    MIRBuilder.buildInstr(TargetOpcode::G_FLOG2)
+        .addDef(getOrCreateVReg(CI))
+        .addUse(getOrCreateVReg(*CI.getArgOperand(0)));
+    return true;
   case Intrinsic::fma:
     MIRBuilder.buildInstr(TargetOpcode::G_FMA)
         .addDef(getOrCreateVReg(CI))
Index: test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
===================================================================
--- test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
+++ test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
@@ -1291,6 +1291,25 @@
   ret float %res
 }
 
+declare float @llvm.log.f32(float)
+define float @test_log_intrin(float %a) {
+; CHECK-LABEL: name: test_log_intrin
+; CHECK: [[A:%[0-9]+]](s32) = COPY %s0
+; CHECK: [[RES:%[0-9]+]](s32) = G_FLOG [[A]]
+; CHECK: %s0 = COPY [[RES]]
+  %res = call float @llvm.log.f32(float %a)
+  ret float %res
+}
+
+declare float @llvm.log2.f32(float)
+define float @test_log2_intrin(float %a) {
+; CHECK-LABEL: name: test_log2_intrin
+; CHECK: [[A:%[0-9]+]](s32) = COPY %s0
+; CHECK: [[RES:%[0-9]+]](s32) = G_FLOG2 [[A]]
+; CHECK: %s0 = COPY [[RES]]
+  %res = call float @llvm.log2.f32(float %a)
+  ret float %res
+}
 declare void @llvm.lifetime.start.p0i8(i64, i8*)
 declare void @llvm.lifetime.end.p0i8(i64, i8*)
 define void @test_lifetime_intrin() {