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120
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1 ; Test the backchain attribute.
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2 ;
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3 ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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4
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5 declare i8 *@llvm.stacksave()
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6 declare void @llvm.stackrestore(i8 *)
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7 declare void @g()
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8
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9 ; nothing should happen if no stack frame is needed.
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10 define void @f1() "backchain" {
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11 ; CHECK-LABEL: f1:
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12 ; CHECK-NOT: stg
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13 ret void
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14 }
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15
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16 ; check that backchain is saved if we call someone
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17 define void @f2() "backchain" {
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18 ; CHECK-LABEL: f2:
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19 ; CHECK: stmg %r14, %r15, 112(%r15)
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20 ; CHECK: lgr %r1, %r15
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21 ; CHECK: aghi %r15, -160
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22 ; CHECK: stg %r1, 0(%r15)
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23 call void @g()
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24 call void @g()
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25 ret void
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26 }
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27
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28 ; check that backchain is saved if we have an alloca
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29 define void @f3() "backchain" {
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30 ; CHECK-LABEL: f3:
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31 ; CHECK-NOT: stmg
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32 ; CHECK: lgr %r1, %r15
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33 ; CHECK: aghi %r15, -168
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34 ; CHECK: stg %r1, 0(%r15)
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35 %ign = alloca i8, i32 4
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36 ret void
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37 }
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38
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39 ; check that alloca copies the backchain
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40 define void @f4(i32 %len) "backchain" {
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41 ; CHECK-LABEL: f4:
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42 ; CHECK: stmg %r11, %r15, 88(%r15)
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43 ; CHECK: lgr %r1, %r15
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44 ; CHECK: aghi %r15, -160
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45 ; CHECK: stg %r1, 0(%r15)
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46 ; CHECK: lgr %r11, %r15
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47 ; CHECK: lg [[BC:%r[0-9]+]], 0(%r15)
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48 ; CHECK: lgr [[NEWSP:%r[0-9]+]], %r15
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49 ; CHECK: lgr %r15, [[NEWSP]]
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50 ; CHECK: stg [[BC]], 0([[NEWSP]])
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51 %ign = alloca i8, i32 %len
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52 ret void
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53 }
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54
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55 ; check that llvm.stackrestore restores the backchain
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56 define void @f5(i32 %count1, i32 %count2) "backchain" {
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57 ; CHECK-LABEL: f5:
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58 ; CHECK: stmg %r11, %r15, 88(%r15)
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59 ; CHECK: lgr %r1, %r15
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60 ; CHECK: aghi %r15, -160
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61 ; CHECK: stg %r1, 0(%r15)
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62 ; CHECK: lgr %r11, %r15
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121
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63 ; CHECK-DAG: lgr [[SAVESP:%r[0-9]+]], %r15
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64 ; CHECK-DAG: lg [[BC:%r[0-9]+]], 0(%r15)
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65 ; CHECK-DAG: lgr [[NEWSP:%r[0-9]+]], %r15
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66 ; CHECK-DAG: lgr %r15, [[NEWSP]]
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67 ; CHECK-DAG: stg [[BC]], 0([[NEWSP]])
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68 ; CHECK-DAG: lg [[BC2:%r[0-9]+]], 0(%r15)
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69 ; CHECK-DAG: lgr %r15, [[SAVESP]]
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70 ; CHECK-DAG: stg [[BC2]], 0([[SAVESP]])
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71 ; CHECK-DAG: lg [[BC3:%r[0-9]+]], 0(%r15)
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72 ; CHECK-DAG: lgr [[NEWSP2:%r[0-9]+]], %r15
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73 ; CHECK-DAG: lgr %r15, [[NEWSP2]]
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74 ; CHECK-DAG: stg [[BC3]], 0([[NEWSP2]])
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120
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75 ; CHECK: lmg %r11, %r15, 248(%r11)
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76 ; CHECK: br %r14
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77 %src = call i8 *@llvm.stacksave()
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78 %array1 = alloca i8, i32 %count1
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79 store volatile i8 0, i8 *%array1
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80 call void @llvm.stackrestore(i8 *%src)
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81 %array2 = alloca i8, i32 %count2
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82 store volatile i8 0, i8 *%array2
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83 ret void
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84 }
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