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121
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1 ; Test load-and-trap instructions (LFHAT)
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2 ; See comments in asm-18.ll about testing high-word operations.
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3 ;
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4 ; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=zEC12 \
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5 ; RUN: -no-integrated-as | FileCheck %s
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6
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7 declare void @llvm.trap()
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8
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9 ; Check LAT with no displacement.
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10 define void @f1(i32 *%ptr) {
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11 ; CHECK-LABEL: f1:
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12 ; CHECK: lfhat [[REG:%r[0-9]+]], 0(%r2)
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13 ; CHECK: stepa [[REG]]
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14 ; CHECK: br %r14
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15 entry:
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16 %val = load i32, i32 *%ptr
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17 %cmp = icmp eq i32 %val, 0
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18 br i1 %cmp, label %if.then, label %if.end
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19
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20 if.then: ; preds = %entry
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21 tail call void @llvm.trap()
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22 unreachable
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23
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24 if.end: ; preds = %entry
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25 call void asm sideeffect "stepa $0", "h"(i32 %val)
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26 ret void;
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27 }
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28
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29 ; Check the high end of the LAT range.
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30 define void @f2(i32 *%src) {
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31 ; CHECK-LABEL: f2:
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32 ; CHECK: lfhat [[REG:%r[0-9]+]], 524284(%r2)
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33 ; CHECK: stepa [[REG]]
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34 ; CHECK: br %r14
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35 %ptr = getelementptr i32, i32 *%src, i64 131071
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36 %val = load i32, i32 *%ptr
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37 %cmp = icmp eq i32 %val, 0
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38 br i1 %cmp, label %if.then, label %if.end
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39
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40 if.then: ; preds = %entry
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41 tail call void @llvm.trap()
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42 unreachable
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43
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44 if.end: ; preds = %entry
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45 call void asm sideeffect "stepa $0", "h"(i32 %val)
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46 ret void;
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47 }
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48
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49 ; Check the next word up, which needs separate address logic.
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50 ; Other sequences besides this one would be OK.
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51 define void @f3(i32 *%src) {
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52 ; CHECK-LABEL: f3:
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53 ; CHECK: agfi %r2, 524288
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54 ; CHECK: lfhat [[REG:%r[0-9]+]], 0(%r2)
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55 ; CHECK: stepa [[REG]]
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56 ; CHECK: br %r14
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57 %ptr = getelementptr i32, i32 *%src, i64 131072
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58 %val = load i32, i32 *%ptr
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59 %cmp = icmp eq i32 %val, 0
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60 br i1 %cmp, label %if.then, label %if.end
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61
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62 if.then: ; preds = %entry
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63 tail call void @llvm.trap()
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64 unreachable
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65
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66 if.end: ; preds = %entry
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67 call void asm sideeffect "stepa $0", "h"(i32 %val)
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68 ret void;
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69 }
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70
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71 ; Check that LAT allows an index.
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72 define void @f4(i64 %src, i64 %index) {
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73 ; CHECK-LABEL: f4:
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74 ; CHECK: lfhat [[REG:%r[0-9]+]], 524287(%r3,%r2)
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75 ; CHECK: stepa [[REG]]
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76 ; CHECK: br %r14
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77 %add1 = add i64 %src, %index
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78 %add2 = add i64 %add1, 524287
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79 %ptr = inttoptr i64 %add2 to i32 *
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80 %val = load i32, i32 *%ptr
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81 %cmp = icmp eq i32 %val, 0
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82 br i1 %cmp, label %if.then, label %if.end
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83
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84 if.then: ; preds = %entry
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85 tail call void @llvm.trap()
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86 unreachable
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87
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88 if.end: ; preds = %entry
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89 call void asm sideeffect "stepa $0", "h"(i32 %val)
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90 ret void;
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91 }
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92
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