1 ; RUN: llc < %s -mtriple=thumbv7-apple-darwin | FileCheck %s 2 target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:32-n32" 3 4 define i32 @test(i32 %n) nounwind { 5 ; CHECK-LABEL: test: 6 ; CHECK-NOT: mov 7 ; CHECK: return 8 entry: 9 %0 = icmp eq i32 %n, 1 ; <i1> [#uses=1] 10 br i1 %0, label %return, label %bb.nph 11 12 bb.nph: ; preds = %entry 13 %tmp = add i32 %n, -1 ; <i32> [#uses=1] 14 br label %bb 15 16 bb: ; preds = %bb.nph, %bb 17 %indvar = phi i32 [ 0, %bb.nph ], [ %indvar.next, %bb ] ; <i32> [#uses=1] 18 %u.05 = phi i64 [ undef, %bb.nph ], [ %ins, %bb ] ; <i64> [#uses=1] 19 %1 = tail call i32 @f() nounwind ; <i32> [#uses=1] 20 %tmp4 = zext i32 %1 to i64 ; <i64> [#uses=1] 21 %mask = and i64 %u.05, -4294967296 ; <i64> [#uses=1] 22 %ins = or i64 %tmp4, %mask ; <i64> [#uses=2] 23 tail call void @g(i64 %ins) nounwind 24 %indvar.next = add i32 %indvar, 1 ; <i32> [#uses=2] 25 %exitcond = icmp eq i32 %indvar.next, %tmp ; <i1> [#uses=1] 26 br i1 %exitcond, label %return, label %bb 27 28 return: ; preds = %bb, %entry 29 ret i32 undef 30 } 31 32 define i32 @test_dead_cycle(i32 %n) nounwind { 33 ; CHECK-LABEL: test_dead_cycle: 34 ; CHECK: blx 35 ; CHECK-NOT: mov 36 ; CHECK: blx 37 entry: 38 %0 = icmp eq i32 %n, 1 ; <i1> [#uses=1] 39 br i1 %0, label %return, label %bb.nph 40 41 bb.nph: ; preds = %entry 42 %tmp = add i32 %n, -1 ; <i32> [#uses=2] 43 br label %bb 44 45 bb: ; preds = %bb.nph, %bb2 46 %indvar = phi i32 [ 0, %bb.nph ], [ %indvar.next, %bb2 ] ; <i32> [#uses=2] 47 %u.17 = phi i64 [ undef, %bb.nph ], [ %u.0, %bb2 ] ; <i64> [#uses=2] 48 %tmp9 = sub i32 %tmp, %indvar ; <i32> [#uses=1] 49 %1 = icmp sgt i32 %tmp9, 1 ; <i1> [#uses=1] 50 br i1 %1, label %bb1, label %bb2 51 52 bb1: ; preds = %bb 53 %2 = tail call i32 @f() nounwind ; <i32> [#uses=1] 54 %tmp6 = zext i32 %2 to i64 ; <i64> [#uses=1] 55 %mask = and i64 %u.17, -4294967296 ; <i64> [#uses=1] 56 %ins = or i64 %tmp6, %mask ; <i64> [#uses=1] 57 tail call void @g(i64 %ins) nounwind 58 br label %bb2 59 60 bb2: ; preds = %bb1, %bb 61 ; also check for duplicate induction variables (radar 7645034) 62 ; CHECK: subs r{{.*}}, #1 63 ; CHECK-NOT: subs r{{.*}}, #1 64 ; CHECK: pop 65 %u.0 = phi i64 [ %ins, %bb1 ], [ %u.17, %bb ] ; <i64> [#uses=2] 66 %indvar.next = add i32 %indvar, 1 ; <i32> [#uses=2] 67 %exitcond = icmp eq i32 %indvar.next, %tmp ; <i1> [#uses=1] 68 br i1 %exitcond, label %return, label %bb 69 70 return: ; preds = %bb2, %entry 71 ret i32 undef 72 } 73 74 declare i32 @f() 75 76 declare void @g(i64) 77
