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      1 ; RUN: llc -march=x86-64 < %s | FileCheck %s
      2 
      3 ; LSR would like to use a single IV for both of these, however it's
      4 ; not safe due to wraparound.
      5 
      6 ; CHECK: addb  $-4, %
      7 ; CHECK: decw  %
      8 
      9 @g_19 = common global i32 0                       ; <i32*> [#uses=2]
     10 
     11 declare i32 @func_8(i8 zeroext) nounwind
     12 
     13 declare i32 @func_3(i8 signext) nounwind
     14 
     15 define void @func_1() nounwind {
     16 entry:
     17   br label %bb
     18 
     19 bb:                                               ; preds = %bb, %entry
     20   %indvar = phi i16 [ 0, %entry ], [ %indvar.next, %bb ] ; <i16> [#uses=2]
     21   %tmp = sub i16 0, %indvar                       ; <i16> [#uses=1]
     22   %tmp27 = trunc i16 %tmp to i8                   ; <i8> [#uses=1]
     23   %tmp1 = load i32* @g_19, align 4                ; <i32> [#uses=2]
     24   %tmp2 = add i32 %tmp1, 1                        ; <i32> [#uses=1]
     25   store i32 %tmp2, i32* @g_19, align 4
     26   %tmp3 = trunc i32 %tmp1 to i8                   ; <i8> [#uses=1]
     27   %tmp4 = tail call i32 @func_8(i8 zeroext %tmp3) nounwind ; <i32> [#uses=0]
     28   %tmp5 = shl i8 %tmp27, 2                        ; <i8> [#uses=1]
     29   %tmp6 = add i8 %tmp5, -112                      ; <i8> [#uses=1]
     30   %tmp7 = tail call i32 @func_3(i8 signext %tmp6) nounwind ; <i32> [#uses=0]
     31   %indvar.next = add i16 %indvar, 1               ; <i16> [#uses=2]
     32   %exitcond = icmp eq i16 %indvar.next, -28       ; <i1> [#uses=1]
     33   br i1 %exitcond, label %return, label %bb
     34 
     35 return:                                           ; preds = %bb
     36   ret void
     37 }
     38