[llvm] r327215 - [llvm-mca] BackendStatistics: early exit from method printSchedulerUsage if the

[Andrea Di Biagio via llvm-commits]

Author: adibiagio
Date: Sat Mar 10 09:40:25 2018
New Revision: 327215

URL: http://llvm.org/viewvc/llvm-project?rev=327215&view=rev
Log:
[llvm-mca] BackendStatistics: early exit from method printSchedulerUsage if the
no scheduler resources were consumed.

Added:
    llvm/trunk/test/tools/llvm-mca/AArch64/Exynos/scheduler-queue-usage.s
    llvm/trunk/test/tools/llvm-mca/X86/BtVer2/scheduler-queue-usage.s
Modified:
    llvm/trunk/tools/llvm-mca/BackendStatistics.cpp

Added: llvm/trunk/test/tools/llvm-mca/AArch64/Exynos/scheduler-queue-usage.s
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/tools/llvm-mca/AArch64/Exynos/scheduler-queue-usage.s?rev=327215&view=auto
==============================================================================
--- llvm/trunk/test/tools/llvm-mca/AArch64/Exynos/scheduler-queue-usage.s (added)
+++ llvm/trunk/test/tools/llvm-mca/AArch64/Exynos/scheduler-queue-usage.s Sat Mar 10 09:40:25 2018
@@ -0,0 +1,7 @@
+# RUN: llvm-mca -march=aarch64 -mcpu=exynos-m3 -iterations=1 -verbose < %s | FileCheck %s -check-prefix=ALL
+# RUN: llvm-mca -march=aarch64 -mcpu=exynos-m1 -iterations=1 -verbose < %s | FileCheck %s -check-prefix=ALL
+
+   b   t
+
+# ALL:      Scheduler's queue usage:
+# ALL-NEXT: No scheduler resources used.

Added: llvm/trunk/test/tools/llvm-mca/X86/BtVer2/scheduler-queue-usage.s
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/tools/llvm-mca/X86/BtVer2/scheduler-queue-usage.s?rev=327215&view=auto
==============================================================================
--- llvm/trunk/test/tools/llvm-mca/X86/BtVer2/scheduler-queue-usage.s (added)
+++ llvm/trunk/test/tools/llvm-mca/X86/BtVer2/scheduler-queue-usage.s Sat Mar 10 09:40:25 2018
@@ -0,0 +1,34 @@
+# RUN: llvm-mca -mtriple=x86_64-unknown-unknown -mcpu=btver2 -iterations=1 -verbose < %s | FileCheck %s
+
+vmulps (%rsi), %xmm0, %xmm0
+add  %rsi, %rsi
+
+# CHECK:      Scheduler's queue usage:
+# CHECK-NEXT: JALU01,  1/20
+# CHECK-NEXT: JFPU01,  1/18
+# CHECK-NEXT: JLSAGU,  1/12
+
+# CHECK:      Resources:
+# CHECK-NEXT: [0] - JALU0
+# CHECK-NEXT: [1] - JALU1
+# CHECK-NEXT: [2] - JDiv
+# CHECK-NEXT: [3] - JFPA
+# CHECK-NEXT: [4] - JFPM
+# CHECK-NEXT: [5] - JFPU0
+# CHECK-NEXT: [6] - JFPU1
+# CHECK-NEXT: [7] - JLAGU
+# CHECK-NEXT: [8] - JMul
+# CHECK-NEXT: [9] - JSAGU
+# CHECK-NEXT: [10] - JSTC
+# CHECK-NEXT: [11] - JVALU0
+# CHECK-NEXT: [12] - JVALU1
+# CHECK-NEXT: [13] - JVIMUL
+
+# CHECK:      Resource pressure per iteration:
+# CHECK-NEXT: [0]    [1]    [2]    [3]    [4]    [5]    [6]    [7]    [8]    [9]    [10]   [11]   [12]   [13]   
+# CHECK-NEXT:  -     1.00    -      -      -      -     1.00   1.00    -      -      -      -      -      -     
+
+# CHECK:      Resource pressure by instruction:
+# CHECK-NEXT: [0]    [1]    [2]    [3]    [4]    [5]    [6]    [7]    [8]    [9]    [10]   [11]   [12]   [13]   	Instructions:
+# CHECK-NEXT:  -      -      -      -      -      -     1.00   1.00    -      -      -      -      -      -     	vmulps	(%rsi), %xmm0, %xmm0
+# CHECK-NEXT:  -     1.00    -      -      -      -      -      -      -      -      -      -      -      -     	addq	%rsi, %rsi

Modified: llvm/trunk/tools/llvm-mca/BackendStatistics.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/tools/llvm-mca/BackendStatistics.cpp?rev=327215&r1=327214&r2=327215&view=diff
==============================================================================
--- llvm/trunk/tools/llvm-mca/BackendStatistics.cpp (original)
+++ llvm/trunk/tools/llvm-mca/BackendStatistics.cpp Sat Mar 10 09:40:25 2018
@@ -118,9 +118,18 @@ void BackendStatistics::printDispatchSta
 void BackendStatistics::printSchedulerUsage(
     raw_ostream &OS, const MCSchedModel &SM,
     const ArrayRef<BufferUsageEntry> &Usage) const {
+ 
   std::string Buffer;
   raw_string_ostream TempStream(Buffer);
   TempStream << "\n\nScheduler's queue usage:\n";
+  // Early exit if no buffered resources were consumed.
+  if (Usage.empty()) {
+    TempStream << "No scheduler resources used.\n";
+    TempStream.flush();
+    OS << Buffer;
+    return;
+  }
+
   for (unsigned I = 0, E = SM.getNumProcResourceKinds(); I < E; ++I) {
     const MCProcResourceDesc &ProcResource = *SM.getProcResource(I);
     if (!ProcResource.BufferSize)