test/tools/llvm-mca/X86/BtVer2/dependency-breaking-cmp.s

   1 # NOTE: Assertions have been autogenerated by utils/update_mca_test_checks.py
   2 # RUN: llvm-mca -mtriple=x86_64-unknown-unknown -mcpu=btver2 -timeline -timeline-max-iterations=3 -iterations=1500 < %s | FileCheck %s
   3
   4 # Perf stat reports an IPC of 1.97 for this block of code.
   5
   6 # The CMP instruction doesn't depend on the value of EAX.  It can set the flags
   7 # without having to read the inputs.
   8
   9 cmp %eax, %eax
  10 cmovae %ebx, %eax
  11
  12 # CHECK:      Iterations:        1500
  13 # CHECK-NEXT: Instructions:      3000
  14 # CHECK-NEXT: Total Cycles:      1504
  15 # CHECK-NEXT: Total uOps:        3000
  16
  17 # CHECK:      Dispatch Width:    2
  18 # CHECK-NEXT: uOps Per Cycle:    1.99
  19 # CHECK-NEXT: IPC:               1.99
  20 # CHECK-NEXT: Block RThroughput: 1.0
  21
  22 # CHECK:      Instruction Info:
  23 # CHECK-NEXT: [1]: #uOps
  24 # CHECK-NEXT: [2]: Latency
  25 # CHECK-NEXT: [3]: RThroughput
  26 # CHECK-NEXT: [4]: MayLoad
  27 # CHECK-NEXT: [5]: MayStore
  28 # CHECK-NEXT: [6]: HasSideEffects (U)
  29
  30 # CHECK:      [1]    [2]    [3]    [4]    [5]    [6]    Instructions:
  31 # CHECK-NEXT:  1      1     0.50                        cmpl    %eax, %eax
  32 # CHECK-NEXT:  1      1     0.50                        cmovael %ebx, %eax
  33
  34 # CHECK:      Resources:
  35 # CHECK-NEXT: [0]   - JALU0
  36 # CHECK-NEXT: [1]   - JALU1
  37 # CHECK-NEXT: [2]   - JDiv
  38 # CHECK-NEXT: [3]   - JFPA
  39 # CHECK-NEXT: [4]   - JFPM
  40 # CHECK-NEXT: [5]   - JFPU0
  41 # CHECK-NEXT: [6]   - JFPU1
  42 # CHECK-NEXT: [7]   - JLAGU
  43 # CHECK-NEXT: [8]   - JMul
  44 # CHECK-NEXT: [9]   - JSAGU
  45 # CHECK-NEXT: [10]  - JSTC
  46 # CHECK-NEXT: [11]  - JVALU0
  47 # CHECK-NEXT: [12]  - JVALU1
  48 # CHECK-NEXT: [13]  - JVIMUL
  49
  50 # CHECK:      Resource pressure per iteration:
  51 # CHECK-NEXT: [0]    [1]    [2]    [3]    [4]    [5]    [6]    [7]    [8]    [9]    [10]   [11]   [12]   [13]
  52 # CHECK-NEXT: 1.00   1.00    -      -      -      -      -      -      -      -      -      -      -      -
  53
  54 # CHECK:      Resource pressure by instruction:
  55 # CHECK-NEXT: [0]    [1]    [2]    [3]    [4]    [5]    [6]    [7]    [8]    [9]    [10]   [11]   [12]   [13]   Instructions:
  56 # CHECK-NEXT:  -     1.00    -      -      -      -      -      -      -      -      -      -      -      -     cmpl    %eax, %eax
  57 # CHECK-NEXT: 1.00    -      -      -      -      -      -      -      -      -      -      -      -      -     cmovael %ebx, %eax
  58
  59 # CHECK:      Timeline view:
  60 # CHECK-NEXT: Index     0123456
  61
  62 # CHECK:      [0,0]     DeER ..   cmpl  %eax, %eax
  63 # CHECK-NEXT: [0,1]     D=eER..   cmovael       %ebx, %eax
  64 # CHECK-NEXT: [1,0]     .DeER..   cmpl  %eax, %eax
  65 # CHECK-NEXT: [1,1]     .D=eER.   cmovael       %ebx, %eax
  66 # CHECK-NEXT: [2,0]     . DeER.   cmpl  %eax, %eax
  67 # CHECK-NEXT: [2,1]     . D=eER   cmovael       %ebx, %eax
  68
  69 # CHECK:      Average Wait times (based on the timeline view):
  70 # CHECK-NEXT: [0]: Executions
  71 # CHECK-NEXT: [1]: Average time spent waiting in a scheduler's queue
  72 # CHECK-NEXT: [2]: Average time spent waiting in a scheduler's queue while ready
  73 # CHECK-NEXT: [3]: Average time elapsed from WB until retire stage
  74
  75 # CHECK:            [0]    [1]    [2]    [3]
  76 # CHECK-NEXT: 0.     3     1.0    1.0    0.0       cmpl %eax, %eax
  77 # CHECK-NEXT: 1.     3     2.0    0.0    0.0       cmovael      %ebx, %eax
  78 # CHECK-NEXT:        3     1.5    0.5    0.0       <total>