dependency-breaking-cmp.s
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# NOTE: Assertions have been autogenerated by utils/update_mca_test_checks.py
# RUN: llvm-mca -mtriple=x86_64-unknown-unknown -mcpu=bdver2 -timeline -timeline-max-iterations=3 -iterations=1500 < %s | FileCheck %s
# Perf stat reports an IPC of 1.97 for this block of code.
# The CMP instruction doesn't depend on the value of EAX. It can set the flags
# without having to read the inputs.
cmp %eax, %eax
cmovae %ebx, %eax
# CHECK: Iterations: 1500
# CHECK-NEXT: Instructions: 3000
# CHECK-NEXT: Total Cycles: 2253
# CHECK-NEXT: Total uOps: 3000
# CHECK: Dispatch Width: 4
# CHECK-NEXT: uOps Per Cycle: 1.33
# CHECK-NEXT: IPC: 1.33
# CHECK-NEXT: Block RThroughput: 1.5
# CHECK: Instruction Info:
# CHECK-NEXT: [1]: #uOps
# CHECK-NEXT: [2]: Latency
# CHECK-NEXT: [3]: RThroughput
# CHECK-NEXT: [4]: MayLoad
# CHECK-NEXT: [5]: MayStore
# CHECK-NEXT: [6]: HasSideEffects (U)
# CHECK: [1] [2] [3] [4] [5] [6] Instructions:
# CHECK-NEXT: 1 1 1.00 cmpl %eax, %eax
# CHECK-NEXT: 1 1 0.50 cmovael %ebx, %eax
# CHECK: Resources:
# CHECK-NEXT: [0.0] - PdAGLU01
# CHECK-NEXT: [0.1] - PdAGLU01
# CHECK-NEXT: [1] - PdBranch
# CHECK-NEXT: [2] - PdCount
# CHECK-NEXT: [3] - PdDiv
# CHECK-NEXT: [4] - PdEX0
# CHECK-NEXT: [5] - PdEX1
# CHECK-NEXT: [6] - PdFPCVT
# CHECK-NEXT: [7.0] - PdFPFMA
# CHECK-NEXT: [7.1] - PdFPFMA
# CHECK-NEXT: [8.0] - PdFPMAL
# CHECK-NEXT: [8.1] - PdFPMAL
# CHECK-NEXT: [9] - PdFPMMA
# CHECK-NEXT: [10] - PdFPSTO
# CHECK-NEXT: [11] - PdFPU0
# CHECK-NEXT: [12] - PdFPU1
# CHECK-NEXT: [13] - PdFPU2
# CHECK-NEXT: [14] - PdFPU3
# CHECK-NEXT: [15] - PdFPXBR
# CHECK-NEXT: [16.0] - PdLoad
# CHECK-NEXT: [16.1] - PdLoad
# CHECK-NEXT: [17] - PdMul
# CHECK-NEXT: [18] - PdStore
# CHECK: Resource pressure per iteration:
# CHECK-NEXT: [0.0] [0.1] [1] [2] [3] [4] [5] [6] [7.0] [7.1] [8.0] [8.1] [9] [10] [11] [12] [13] [14] [15] [16.0] [16.1] [17] [18]
# CHECK-NEXT: - - - - - 1.50 1.50 - - - - - - - - - - - - - - - -
# CHECK: Resource pressure by instruction:
# CHECK-NEXT: [0.0] [0.1] [1] [2] [3] [4] [5] [6] [7.0] [7.1] [8.0] [8.1] [9] [10] [11] [12] [13] [14] [15] [16.0] [16.1] [17] [18] Instructions:
# CHECK-NEXT: - - - - - 1.00 1.00 - - - - - - - - - - - - - - - - cmpl %eax, %eax
# CHECK-NEXT: - - - - - 0.50 0.50 - - - - - - - - - - - - - - - - cmovael %ebx, %eax
# CHECK: Timeline view:
# CHECK-NEXT: Index 01234567
# CHECK: [0,0] DeER . . cmpl %eax, %eax
# CHECK-NEXT: [0,1] D==eER . cmovael %ebx, %eax
# CHECK-NEXT: [1,0] DeE--R . cmpl %eax, %eax
# CHECK-NEXT: [1,1] D===eER. cmovael %ebx, %eax
# CHECK-NEXT: [2,0] .D=eE-R. cmpl %eax, %eax
# CHECK-NEXT: [2,1] .D===eER cmovael %ebx, %eax
# CHECK: Average Wait times (based on the timeline view):
# CHECK-NEXT: [0]: Executions
# CHECK-NEXT: [1]: Average time spent waiting in a scheduler's queue
# CHECK-NEXT: [2]: Average time spent waiting in a scheduler's queue while ready
# CHECK-NEXT: [3]: Average time elapsed from WB until retire stage
# CHECK: [0] [1] [2] [3]
# CHECK-NEXT: 0. 3 1.3 1.3 1.0 cmpl %eax, %eax
# CHECK-NEXT: 1. 3 3.7 0.3 0.0 cmovael %ebx, %eax
# CHECK-NEXT: 3 2.5 0.8 0.5 <total>