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annotate test/CodeGen/AMDGPU/structurize.ll @ 121:803732b1fca8

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LLVM 5.0
author kono
date Fri, 27 Oct 2017 17:07:41 +0900
parents 1172e4bd9c6f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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120
1172e4bd9c6f update 4.0.0
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1 ; RUN: llc < %s -march=r600 -mcpu=redwood -r600-ir-structurize=0 | FileCheck %s
0
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2 ; Test case for a crash in the AMDILCFGStructurizer from a CFG like this:
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3 ;
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4 ; entry
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5 ; / \
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6 ; diamond_head branch_from
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7 ; / \ |
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8 ; diamond_false diamond_true
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9 ; \ /
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10 ; done
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11 ;
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12 ; When the diamond_true branch had more than 100 instructions.
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13 ;
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14 ;
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15
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16 ; CHECK-LABEL: {{^}}branch_into_diamond:
0
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17 ; === entry block:
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18 ; CHECK: ALU_PUSH_BEFORE
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19 ; === Branch instruction (IF):
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20 ; CHECK: JUMP
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21 ; === branch_from block
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22 ; CHECK: ALU
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23 ; === Duplicated diamond_true block (There can be more than one ALU clause):
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24 ; === XXX: We should be able to optimize this so the basic block is not
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25 ; === duplicated. See comments in
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26 ; === AMDGPUCFGStructurizer::improveSimpleJumpintoIf()
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27 ; CHECK: ALU
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28 ; === Branch instruction (ELSE):
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29 ; CHECK: ELSE
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30 ; === diamond_head block:
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31 ; CHECK: ALU_PUSH_BEFORE
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32 ; === Branch instruction (IF):
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33 ; CHECK: JUMP
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34 ; === diamond_true block (There can be more than one ALU clause):
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35 ; ALU
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36 ; === Branch instruction (ELSE):
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37 ; CHECK: ELSE
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38 ; === diamond_false block plus implicit ENDIF
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39 ; CHECK: ALU_POP_AFTER
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40 ; === Branch instruction (ENDIF):
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41 ; CHECK: POP
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42 ; === done block:
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43 ; CHECK: ALU
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44 ; CHECK: MEM_RAT_CACHELESS
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45 ; CHECK: CF_END
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46
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47
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48 define amdgpu_kernel void @branch_into_diamond(i32 addrspace(1)* %out, i32 %a, i32 %b, i32 %c) {
0
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49 entry:
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50 %0 = icmp ne i32 %a, 0
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51 br i1 %0, label %diamond_head, label %branch_from
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52
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53 diamond_head:
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54 %1 = icmp ne i32 %a, 1
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55 br i1 %1, label %diamond_true, label %diamond_false
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56
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57 branch_from:
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58 %2 = add i32 %a, 1
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59 br label %diamond_true
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60
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61 diamond_false:
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62 %3 = add i32 %a, 2
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63 br label %done
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64
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65 diamond_true:
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66 %4 = phi i32 [%2, %branch_from], [%a, %diamond_head]
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67 ; This block needs to be > 100 ISA instructions to hit the bug,
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68 ; so we'll use udiv instructions.
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69 %div0 = udiv i32 %a, %b
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70 %div1 = udiv i32 %div0, %4
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71 %div2 = udiv i32 %div1, 11
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72 %div3 = udiv i32 %div2, %a
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73 %div4 = udiv i32 %div3, %b
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74 %div5 = udiv i32 %div4, %c
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75 %div6 = udiv i32 %div5, %div0
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76 %div7 = udiv i32 %div6, %div1
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77 br label %done
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78
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79 done:
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80 %5 = phi i32 [%3, %diamond_false], [%div7, %diamond_true]
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81 store i32 %5, i32 addrspace(1)* %out
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82 ret void
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83 }