diff --git a/llvm/include/llvm/Analysis/VecFuncs.def b/llvm/include/llvm/Analysis/VecFuncs.def
--- a/llvm/include/llvm/Analysis/VecFuncs.def
+++ b/llvm/include/llvm/Analysis/VecFuncs.def
@@ -245,6 +245,30 @@
 TLI_DEFINE_VECFUNC("llvm.log.f32", "__svml_logf8", 8)
 TLI_DEFINE_VECFUNC("llvm.log.f32", "__svml_logf16", 16)
 
+TLI_DEFINE_VECFUNC("log2", "__svml_log22", 2)
+TLI_DEFINE_VECFUNC("log2", "__svml_log24", 4)
+TLI_DEFINE_VECFUNC("log2", "__svml_log28", 8)
+
+TLI_DEFINE_VECFUNC("log2f", "__svml_log2f4", 4)
+TLI_DEFINE_VECFUNC("log2f", "__svml_log2f8", 8)
+TLI_DEFINE_VECFUNC("log2f", "__svml_log2f16", 16)
+
+TLI_DEFINE_VECFUNC("__log2_finite", "__svml_log22", 2)
+TLI_DEFINE_VECFUNC("__log2_finite", "__svml_log24", 4)
+TLI_DEFINE_VECFUNC("__log2_finite", "__svml_log28", 8)
+
+TLI_DEFINE_VECFUNC("__log2f_finite", "__svml_log2f4", 4)
+TLI_DEFINE_VECFUNC("__log2f_finite", "__svml_log2f8", 8)
+TLI_DEFINE_VECFUNC("__log2f_finite", "__svml_log2f16", 16)
+
+TLI_DEFINE_VECFUNC("llvm.log2.f64", "__svml_log22", 2)
+TLI_DEFINE_VECFUNC("llvm.log2.f64", "__svml_log24", 4)
+TLI_DEFINE_VECFUNC("llvm.log2.f64", "__svml_log28", 8)
+
+TLI_DEFINE_VECFUNC("llvm.log2.f32", "__svml_log2f4", 4)
+TLI_DEFINE_VECFUNC("llvm.log2.f32", "__svml_log2f8", 8)
+TLI_DEFINE_VECFUNC("llvm.log2.f32", "__svml_log2f16", 16)
+
 TLI_DEFINE_VECFUNC("exp2", "__svml_exp22", 2)
 TLI_DEFINE_VECFUNC("exp2", "__svml_exp24", 4)
 TLI_DEFINE_VECFUNC("exp2", "__svml_exp28", 8)
diff --git a/llvm/test/Transforms/LoopVectorize/X86/svml-calls-finite.ll b/llvm/test/Transforms/LoopVectorize/X86/svml-calls-finite.ll
--- a/llvm/test/Transforms/LoopVectorize/X86/svml-calls-finite.ll
+++ b/llvm/test/Transforms/LoopVectorize/X86/svml-calls-finite.ll
@@ -243,3 +243,60 @@
 !71 = distinct !{!71, !72, !73}
 !72 = !{!"llvm.loop.vectorize.width", i32 4}
 !73 = !{!"llvm.loop.vectorize.enable", i1 true}
+
+declare float @__log2f_finite(float) #0
+
+; CHECK-LABEL: @log2_f32
+; CHECK: <4 x float> @__svml_log2f4
+; CHECK: ret
+define void @log2_f32(float* nocapture %varray) {
+entry:
+  br label %for.body
+
+for.body:                                         ; preds = %for.body, %entry
+  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
+  %tmp = trunc i64 %indvars.iv to i32
+  %conv = sitofp i32 %tmp to float
+  %call = tail call fast float @__log2f_finite(float %conv)
+  %arrayidx = getelementptr inbounds float, float* %varray, i64 %indvars.iv
+  store float %call, float* %arrayidx, align 4
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  %exitcond = icmp eq i64 %indvars.iv.next, 1000
+  br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !21
+
+for.end:                                          ; preds = %for.body
+  ret void
+}
+
+!81 = distinct !{!21, !22, !23}
+!82 = !{!"llvm.loop.vectorize.width", i32 4}
+!83 = !{!"llvm.loop.vectorize.enable", i1 true}
+
+
+declare double @__log2_finite(double) #0
+
+; CHECK-LABEL: @log2_f64
+; CHECK: <4 x double> @__svml_log24
+; CHECK: ret
+define void @log2_f64(double* nocapture %varray) {
+entry:
+  br label %for.body
+
+for.body:                                         ; preds = %for.body, %entry
+  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
+  %tmp = trunc i64 %indvars.iv to i32
+  %conv = sitofp i32 %tmp to double
+  %call = tail call fast double @__log2_finite(double %conv)
+  %arrayidx = getelementptr inbounds double, double* %varray, i64 %indvars.iv
+  store double %call, double* %arrayidx, align 4
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  %exitcond = icmp eq i64 %indvars.iv.next, 1000
+  br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !31
+
+for.end:                                          ; preds = %for.body
+  ret void
+}
+
+!91 = distinct !{!31, !32, !33}
+!92 = !{!"llvm.loop.vectorize.width", i32 4}
+!93 = !{!"llvm.loop.vectorize.enable", i1 true}
diff --git a/llvm/test/Transforms/LoopVectorize/X86/svml-calls.ll b/llvm/test/Transforms/LoopVectorize/X86/svml-calls.ll
--- a/llvm/test/Transforms/LoopVectorize/X86/svml-calls.ll
+++ b/llvm/test/Transforms/LoopVectorize/X86/svml-calls.ll
@@ -28,6 +28,11 @@
 declare double @llvm.log.f64(double) #0
 declare float @llvm.log.f32(float) #0
 
+declare double @log2(double) #0
+declare float @log2f(float) #0
+declare double @llvm.log2.f64(double) #0
+declare float @llvm.log2.f32(float) #0
+
 declare double @exp2(double) #0
 declare float @exp2f(float) #0
 declare double @llvm.exp2.f64(double) #0
@@ -501,6 +506,98 @@
   ret void
 }
 
+define void @log2_f64(double* nocapture %varray) {
+; CHECK-LABEL: @log2_f64(
+; CHECK:    [[TMP5:%.*]] = call <4 x double> @__svml_log24(<4 x double> [[TMP4:%.*]])
+; CHECK:    ret void
+;
+entry:
+  br label %for.body
+
+for.body:
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
+  %tmp = trunc i64 %iv to i32
+  %conv = sitofp i32 %tmp to double
+  %call = tail call double @log2(double %conv)
+  %arrayidx = getelementptr inbounds double, double* %varray, i64 %iv
+  store double %call, double* %arrayidx, align 4
+  %iv.next = add nuw nsw i64 %iv, 1
+  %exitcond = icmp eq i64 %iv.next, 1000
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:
+  ret void
+}
+
+define void @log2_f32(float* nocapture %varray) {
+; CHECK-LABEL: @log2_f32(
+; CHECK:    [[TMP5:%.*]] = call <4 x float> @__svml_log2f4(<4 x float> [[TMP4:%.*]])
+; CHECK:    ret void
+;
+entry:
+  br label %for.body
+
+for.body:
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
+  %tmp = trunc i64 %iv to i32
+  %conv = sitofp i32 %tmp to float
+  %call = tail call float @log2f(float %conv)
+  %arrayidx = getelementptr inbounds float, float* %varray, i64 %iv
+  store float %call, float* %arrayidx, align 4
+  %iv.next = add nuw nsw i64 %iv, 1
+  %exitcond = icmp eq i64 %iv.next, 1000
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:
+  ret void
+}
+
+define void @log2_f64_intrinsic(double* nocapture %varray) {
+; CHECK-LABEL: @log2_f64_intrinsic(
+; CHECK:    [[TMP5:%.*]] = call <4 x double> @__svml_log24(<4 x double> [[TMP4:%.*]])
+; CHECK:    ret void
+;
+entry:
+  br label %for.body
+
+for.body:
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
+  %tmp = trunc i64 %iv to i32
+  %conv = sitofp i32 %tmp to double
+  %call = tail call double @llvm.log2.f64(double %conv)
+  %arrayidx = getelementptr inbounds double, double* %varray, i64 %iv
+  store double %call, double* %arrayidx, align 4
+  %iv.next = add nuw nsw i64 %iv, 1
+  %exitcond = icmp eq i64 %iv.next, 1000
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:
+  ret void
+}
+
+define void @log2_f32_intrinsic(float* nocapture %varray) {
+; CHECK-LABEL: @log2_f32_intrinsic(
+; CHECK:    [[TMP5:%.*]] = call <4 x float> @__svml_log2f4(<4 x float> [[TMP4:%.*]])
+; CHECK:    ret void
+;
+entry:
+  br label %for.body
+
+for.body:
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
+  %tmp = trunc i64 %iv to i32
+  %conv = sitofp i32 %tmp to float
+  %call = tail call float @llvm.log2.f32(float %conv)
+  %arrayidx = getelementptr inbounds float, float* %varray, i64 %iv
+  store float %call, float* %arrayidx, align 4
+  %iv.next = add nuw nsw i64 %iv, 1
+  %exitcond = icmp eq i64 %iv.next, 1000
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:
+  ret void
+}
+
 define void @exp2_f64(double* nocapture %varray) {
 ; CHECK-LABEL: @exp2_f64(
 ; CHECK:    [[TMP5:%.*]] = call <4 x double> @__svml_exp24(<4 x double> [[TMP4:%.*]])