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annotate test/CodeGen/Hexagon/BranchPredict.ll @ 147:c2174574ed3a

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LLVM 10
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Wed, 14 Aug 2019 16:55:33 +0900
parents 803732b1fca8
children
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147
c2174574ed3a LLVM 10
Shinji KONO <kono@ie.u-ryukyu.ac.jp>
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1 ; RUN: llc -march=hexagon -ifcvt-limit=0 -hexagon-initial-cfg-cleanup=0 < %s | FileCheck %s
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2
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3 ; Check if the branch probabilities are reflected in the instructions:
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4 ; The basic block placement pass should place the more probable successor
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5 ; block as the fall-through block. The unconditional jump in the predecessor
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6 ; should then get the right hint (not_taken or ":nt")
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9 @j = external global i32
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10
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11 define i32 @foo(i32 %a) nounwind {
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12 ; CHECK: if (!p{{[0-3]}}.new) jump:nt
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13 entry:
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14 %tobool = icmp eq i32 %a, 0
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15 br i1 %tobool, label %if.else, label %if.then, !prof !0
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16
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17 if.then: ; preds = %entry
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18 %add = add nsw i32 %a, 10
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19 %call = tail call i32 bitcast (i32 (...)* @foobar to i32 (i32)*)(i32 %add) nounwind
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20 br label %return
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21
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22 if.else: ; preds = %entry
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23 %call2 = tail call i32 bitcast (i32 (...)* @foobar to i32 (i32)*)(i32 4) nounwind
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24 br label %return
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25
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26 return: ; preds = %if.else, %if.then
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27 %retval.0 = phi i32 [ %call, %if.then ], [ %call2, %if.else ]
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28 ret i32 %retval.0
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29 }
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30
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31 declare i32 @foobar(...)
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32
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33 define i32 @bar(i32 %a) nounwind {
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34 ; CHECK: if (p{{[0-3]}}.new) jump:nt
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35 entry:
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36 %tobool = icmp eq i32 %a, 0
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37 br i1 %tobool, label %if.else, label %if.then, !prof !1
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38
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39 if.then: ; preds = %entry
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40 %add = add nsw i32 %a, 10
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41 %call = tail call i32 bitcast (i32 (...)* @foobar to i32 (i32)*)(i32 %add) nounwind
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42 br label %return
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43
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44 if.else: ; preds = %entry
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45 %call2 = tail call i32 bitcast (i32 (...)* @foobar to i32 (i32)*)(i32 4) nounwind
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46 br label %return
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47
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48 return: ; preds = %if.else, %if.then
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49 %retval.0 = phi i32 [ %call, %if.then ], [ %call2, %if.else ]
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50 ret i32 %retval.0
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51 }
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52
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53 define i32 @foo_bar(i32 %a, i16 signext %b) nounwind {
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54 ; CHECK: if (!cmp.eq(r{{[0-9]*}}.new,#0)) jump:nt
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55 entry:
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56 %0 = load i32, i32* @j, align 4
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57 %tobool = icmp eq i32 %0, 0
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58 br i1 %tobool, label %if.else, label %if.then, !prof !0
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59
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60 if.then: ; preds = %entry
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61 %add = add nsw i32 %a, 10
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62 %call = tail call i32 bitcast (i32 (...)* @foobar to i32 (i32)*)(i32 %add) nounwind
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63 br label %return
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64
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65 if.else: ; preds = %entry
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66 %add1 = add nsw i32 %a, 4
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67 %call2 = tail call i32 bitcast (i32 (...)* @foobar to i32 (i32)*)(i32 %add1) nounwind
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68 br label %return
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69
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70 return: ; preds = %if.else, %if.then
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71 %retval.0 = phi i32 [ %call, %if.then ], [ %call2, %if.else ]
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72 ret i32 %retval.0
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73 }
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74
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75 !0 = !{!"branch_weights", i32 64, i32 4}
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76 !1 = !{!"branch_weights", i32 4, i32 64}