Index: lib/Target/X86/X86.td
===================================================================
--- lib/Target/X86/X86.td
+++ lib/Target/X86/X86.td
@@ -276,7 +276,7 @@
                       FeaturePOPCNT, FeatureAES, FeaturePCLMUL, FeatureRDRAND,
                       FeatureF16C, FeatureFSGSBase, FeatureMOVBE, FeatureLZCNT,
                       FeatureBMI, FeatureBMI2, FeatureFMA, FeatureRTM,
-                      FeatureHLE]>;
+                      FeatureHLE, FeatureSlowIncDec]>;
 
 // Broadwell
 def : ProcessorModel<"broadwell", HaswellModel,
@@ -284,7 +284,8 @@
                       FeaturePOPCNT, FeatureAES, FeaturePCLMUL, FeatureRDRAND,
                       FeatureF16C, FeatureFSGSBase, FeatureMOVBE, FeatureLZCNT,
                       FeatureBMI, FeatureBMI2, FeatureFMA, FeatureRTM,
-                      FeatureHLE, FeatureADX, FeatureRDSEED, FeatureSMAP]>;
+                      FeatureHLE, FeatureADX, FeatureRDSEED, FeatureSMAP,
+                      FeatureSlowIncDec]>;
 // KNL
 // FIXME: define KNL model
 def : ProcessorModel<"knl", HaswellModel,
Index: test/CodeGen/X86/slow-incdec.ll
===================================================================
--- /dev/null
+++ test/CodeGen/X86/slow-incdec.ll
@@ -0,0 +1,80 @@
+; RUN: llc -mtriple=i386-unknown-linux-gnu -mattr=-slow-incdec < %s | FileCheck -check-prefix=INCDEC %s
+; RUN: llc -mtriple=i386-unknown-linux-gnu -mattr=+slow-incdec < %s | FileCheck -check-prefix=ADD %s
+
+; check -mattr=-slow-incdec
+; INCDEC-NOT: addl $-1
+; INCDEC: dec
+; INCDEC-NOT: addl $1
+; INCDEC: inc
+
+; check -mattr=+slow-incdec
+; ADD: addl $-1
+; ADD-NOT: dec
+; ADD: addl $1
+; ADD-NOT: inc
+
+; Function Attrs: nounwind readonly
+define i32 @slow_1(i32* nocapture readonly %a, i32 %s) #0 {
+entry:
+  %cmp5 = icmp eq i32 %s, 0
+  br i1 %cmp5, label %for.end, label %for.body.preheader
+
+for.body.preheader:                               ; preds = %entry
+  br label %for.body
+
+for.cond:                                         ; preds = %for.body
+  %cmp = icmp eq i32 %dec, 0
+  br i1 %cmp, label %for.end.loopexit, label %for.body
+
+for.body:                                         ; preds = %for.body.preheader, %for.cond
+  %i.06 = phi i32 [ %dec, %for.cond ], [ %s, %for.body.preheader ]
+  %arrayidx = getelementptr inbounds i32* %a, i32 %i.06
+  %0 = load i32* %arrayidx, align 4, !tbaa !1
+  %cmp1 = icmp eq i32 %0, 0
+;
+  %dec = add nsw i32 %i.06, -1
+  br i1 %cmp1, label %for.end.loopexit, label %for.cond
+
+for.end.loopexit:                                 ; preds = %for.cond, %for.body
+  %i.0.lcssa.ph = phi i32 [ 0, %for.cond ], [ %i.06, %for.body ]
+  br label %for.end
+
+for.end:                                          ; preds = %for.end.loopexit, %entry
+  %i.0.lcssa = phi i32 [ 0, %entry ], [ %i.0.lcssa.ph, %for.end.loopexit ]
+  ret i32 %i.0.lcssa
+}
+
+; Function Attrs: nounwind readonly
+define i32 @slow_2(i32* nocapture readonly %a, i32 %s) #0 {
+entry:
+  %cmp5 = icmp eq i32 %s, 0
+  br i1 %cmp5, label %for.end, label %for.body.preheader
+
+for.body.preheader:                               ; preds = %entry
+  br label %for.body
+
+for.cond:                                         ; preds = %for.body
+  %cmp = icmp eq i32 %inc, 0
+  br i1 %cmp, label %for.end.loopexit, label %for.body
+
+for.body:                                         ; preds = %for.body.preheader, %for.cond
+  %i.06 = phi i32 [ %inc, %for.cond ], [ %s, %for.body.preheader ]
+  %arrayidx = getelementptr inbounds i32* %a, i32 %i.06
+  %0 = load i32* %arrayidx, align 4, !tbaa !1
+  %cmp1 = icmp eq i32 %0, 0
+  %inc = add nsw i32 %i.06, 1
+  br i1 %cmp1, label %for.end.loopexit, label %for.cond
+
+for.end.loopexit:                                 ; preds = %for.cond, %for.body
+  %i.0.lcssa.ph = phi i32 [ 0, %for.cond ], [ %i.06, %for.body ]
+  br label %for.end
+
+for.end:                                          ; preds = %for.end.loopexit, %entry
+  %i.0.lcssa = phi i32 [ 0, %entry ], [ %i.0.lcssa.ph, %for.end.loopexit ]
+  ret i32 %i.0.lcssa
+}
+
+!1 = metadata !{metadata !2, metadata !2, i64 0}
+!2 = metadata !{metadata !"int", metadata !3, i64 0}
+!3 = metadata !{metadata !"omnipotent char", metadata !4, i64 0}
+!4 = metadata !{metadata !"Simple C/C++ TBAA"}