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      1 ; RUN: llc < %s -mtriple=arm-apple-darwin | FileCheck %s
      2 
      3 define i32 @f(i32 %a, i32 %b) nounwind ssp {
      4 entry:
      5 ; CHECK-LABEL: f:
      6 ; CHECK: subs
      7 ; CHECK-NOT: cmp
      8   %cmp = icmp sgt i32 %a, %b
      9   %sub = sub nsw i32 %a, %b
     10   %sub. = select i1 %cmp, i32 %sub, i32 0
     11   ret i32 %sub.
     12 }
     13 
     14 define i32 @g(i32 %a, i32 %b) nounwind ssp {
     15 entry:
     16 ; CHECK-LABEL: g:
     17 ; CHECK: subs
     18 ; CHECK-NOT: cmp
     19   %cmp = icmp slt i32 %a, %b
     20   %sub = sub nsw i32 %b, %a
     21   %sub. = select i1 %cmp, i32 %sub, i32 0
     22   ret i32 %sub.
     23 }
     24 
     25 define i32 @h(i32 %a, i32 %b) nounwind ssp {
     26 entry:
     27 ; CHECK-LABEL: h:
     28 ; CHECK: subs
     29 ; CHECK-NOT: cmp
     30   %cmp = icmp sgt i32 %a, 3
     31   %sub = sub nsw i32 %a, 3
     32   %sub. = select i1 %cmp, i32 %sub, i32 %b
     33   ret i32 %sub.
     34 }
     35 
     36 ; rdar://11725965
     37 define i32 @i(i32 %a, i32 %b) nounwind readnone ssp {
     38 entry:
     39 ; CHECK-LABEL: i:
     40 ; CHECK: subs
     41 ; CHECK-NOT: cmp
     42   %cmp = icmp ult i32 %a, %b
     43   %sub = sub i32 %b, %a
     44   %sub. = select i1 %cmp, i32 %sub, i32 0
     45   ret i32 %sub.
     46 }
     47 ; If CPSR is live-out, we can't remove cmp if there exists
     48 ; a swapped sub.
     49 define i32 @j(i32 %a, i32 %b) nounwind {
     50 entry:
     51 ; CHECK-LABEL: j:
     52 ; CHECK: sub
     53 ; CHECK: cmp
     54   %cmp = icmp eq i32 %b, %a
     55   %sub = sub nsw i32 %a, %b
     56   br i1 %cmp, label %if.then, label %if.else
     57 
     58 if.then:
     59   %cmp2 = icmp sgt i32 %b, %a
     60   %sel = select i1 %cmp2, i32 %sub, i32 %a
     61   ret i32 %sel
     62 
     63 if.else:
     64   ret i32 %sub
     65 }
     66 
     67 ; If the sub/rsb instruction is predicated, we can't use the flags.
     68 ; <rdar://problem/12263428>
     69 ; Test case from MultiSource/Benchmarks/Ptrdist/bc/number.s
     70 ; CHECK: bc_raise
     71 ; CHECK: rsbeq
     72 ; CHECK: cmp
     73 define i32 @bc_raise() nounwind ssp {
     74 entry:
     75   %val.2.i = select i1 undef, i32 0, i32 undef
     76   %sub.i = sub nsw i32 0, %val.2.i
     77   %retval.0.i = select i1 undef, i32 %val.2.i, i32 %sub.i
     78   %cmp1 = icmp eq i32 %retval.0.i, 0
     79   br i1 %cmp1, label %land.lhs.true, label %if.end11
     80 
     81 land.lhs.true:                                    ; preds = %num2long.exit
     82   ret i32 17
     83 
     84 if.end11:                                         ; preds = %num2long.exit
     85   ret i32 23
     86 }
     87