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121
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1 ; RUN: llc < %s -march=bpf -verify-machineinstrs | FileCheck %s
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2
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3 ; Source code:
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4 ; struct xdp_md {
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5 ; unsigned data;
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6 ; unsigned data_end;
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7 ; };
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8 ;
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9 ; int gbl;
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10 ; int xdp_dummy(struct xdp_md *xdp)
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11 ; {
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12 ; char tmp;
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13 ; long addr;
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14 ;
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15 ; if (gbl) {
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16 ; long addr1 = (long)xdp->data;
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17 ; tmp = *(char *)addr1;
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18 ; if (tmp == 1)
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19 ; return 3;
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20 ; } else {
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21 ; tmp = *(volatile char *)(long)xdp->data_end;
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22 ; if (tmp == 1)
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23 ; return 2;
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24 ; }
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25 ; addr = (long)xdp->data;
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26 ; tmp = *(volatile char *)addr;
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27 ; if (tmp == 0)
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28 ; return 1;
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29 ; return 0;
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30 ; }
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31
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32 %struct.xdp_md = type { i32, i32 }
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33
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34 @gbl = common local_unnamed_addr global i32 0, align 4
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35
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36 ; Function Attrs: norecurse nounwind
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37 define i32 @xdp_dummy(%struct.xdp_md* nocapture readonly %xdp) local_unnamed_addr #0 {
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38 entry:
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39 %0 = load i32, i32* @gbl, align 4
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40 %tobool = icmp eq i32 %0, 0
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41 br i1 %tobool, label %if.else, label %if.then
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42
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43 if.then: ; preds = %entry
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44 %data = getelementptr inbounds %struct.xdp_md, %struct.xdp_md* %xdp, i64 0, i32 0
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45 %1 = load i32, i32* %data, align 4
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46 %conv = zext i32 %1 to i64
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47 %2 = inttoptr i64 %conv to i8*
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48 %3 = load i8, i8* %2, align 1
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49 %cmp = icmp eq i8 %3, 1
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50 br i1 %cmp, label %cleanup20, label %if.end12
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51 ; CHECK: r1 = *(u32 *)(r1 + 0)
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52 ; CHECK: r2 = *(u8 *)(r1 + 0)
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53
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54 if.else: ; preds = %entry
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55 %data_end = getelementptr inbounds %struct.xdp_md, %struct.xdp_md* %xdp, i64 0, i32 1
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56 %4 = load i32, i32* %data_end, align 4
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57 %conv6 = zext i32 %4 to i64
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58 ; CHECK: r2 = *(u32 *)(r1 + 4)
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59 %5 = inttoptr i64 %conv6 to i8*
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60 %6 = load volatile i8, i8* %5, align 1
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61 %cmp8 = icmp eq i8 %6, 1
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62 br i1 %cmp8, label %cleanup20, label %if.else.if.end12_crit_edge
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63
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64 if.else.if.end12_crit_edge: ; preds = %if.else
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65 %data13.phi.trans.insert = getelementptr inbounds %struct.xdp_md, %struct.xdp_md* %xdp, i64 0, i32 0
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66 %.pre = load i32, i32* %data13.phi.trans.insert, align 4
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67 br label %if.end12
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68 ; CHECK: r1 = *(u32 *)(r1 + 0)
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69
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70 if.end12: ; preds = %if.else.if.end12_crit_edge, %if.then
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71 %7 = phi i32 [ %.pre, %if.else.if.end12_crit_edge ], [ %1, %if.then ]
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72 %conv14 = zext i32 %7 to i64
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73 ; CHECK-NOT: r1 <<= 32
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74 ; CHECK-NOT: r1 >>= 32
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75 %8 = inttoptr i64 %conv14 to i8*
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76 %9 = load volatile i8, i8* %8, align 1
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77 ; CHECK: r1 = *(u8 *)(r1 + 0)
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78 %cmp16 = icmp eq i8 %9, 0
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79 %.28 = zext i1 %cmp16 to i32
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80 br label %cleanup20
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81
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82 cleanup20: ; preds = %if.then, %if.end12, %if.else
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83 %retval.1 = phi i32 [ 3, %if.then ], [ 2, %if.else ], [ %.28, %if.end12 ]
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84 ret i32 %retval.1
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85 }
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86
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87 attributes #0 = { norecurse nounwind }
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