Index: llvm/trunk/include/llvm/Target/TargetInstrInfo.h
===================================================================
--- llvm/trunk/include/llvm/Target/TargetInstrInfo.h
+++ llvm/trunk/include/llvm/Target/TargetInstrInfo.h
@@ -270,11 +270,8 @@
   /// MachineSink determines on its own whether the instruction is safe to sink;
   /// this gives the target a hook to override the default behavior with regards
   /// to which instructions should be sunk.
-  /// The default behavior is to not sink insert_subreg, subreg_to_reg, and
-  /// reg_sequence. These are meant to be close to the source to make it easier
-  /// to coalesce.
   virtual bool shouldSink(const MachineInstr &MI) const {
-    return !MI.isInsertSubreg() && !MI.isSubregToReg() && !MI.isRegSequence();
+    return true;
   }
 
   /// Re-issue the specified 'original' instruction at the
Index: llvm/trunk/test/CodeGen/X86/MachineSink-SubReg.ll
===================================================================
--- llvm/trunk/test/CodeGen/X86/MachineSink-SubReg.ll
+++ llvm/trunk/test/CodeGen/X86/MachineSink-SubReg.ll
@@ -0,0 +1,37 @@
+; PR28852: Check machine code sinking is not stopped by SUBREG_TO_REG.
+; RUN: llc < %s | FileCheck %s
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+; CHECK: foo
+; CHECK-NOT: imull
+; CHECK: retq
+; CHECK: imull
+
+define void @foo(i64 %value, i32 %kLengthBits, i32* nocapture %bits, i64* nocapture %bit_buffer_64, i32 %x) local_unnamed_addr {
+entry:
+  %mul = mul i32 %x, %kLengthBits
+  %add = add i32 %mul, 3
+  %conv = zext i32 %add to i64
+  %mul2 = mul nuw nsw i64 %conv, 5
+  %sub = sub i64 64, %value
+  %conv4 = trunc i64 %sub to i32
+  %tmp0 = load i32, i32* %bits, align 4
+  %cmp = icmp ult i32 %tmp0, %conv4
+  br i1 %cmp, label %if.then, label %if.end, !prof !0
+
+if.then:                                          ; preds = %entry
+  %add7 = add i64 %mul2, %value
+  %tmp1 = load i64, i64* %bit_buffer_64, align 8
+  %add8 = add i64 %add7, %tmp1
+  store i64 %add8, i64* %bit_buffer_64, align 8
+  %conv9 = trunc i64 %mul2 to i32
+  store i32 %conv9, i32* %bits, align 4
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  ret void
+}
+
+!0 = !{!"branch_weights", i32 1, i32 2000}