[MCA] Don't assume that createMCInstrAnalysis() always returns a valid pointer.

Class InstrBuilder wrongly assumed that llvm targets were always able to return
a non-null pointer when createMCInstrAnalysis() was called on them.
This was causing crashes when simulating executions for targets that don't
provide an MCInstrAnalysis object.
This patch fixes the issue by making MCInstrAnalysis optional.

llvm-svn: 349352

2 files changed, 75 insertions, 0 deletions

diff --git a/llvm/test/tools/llvm-mca/SystemZ/lit.local.cfg b/llvm/test/tools/llvm-mca/SystemZ/lit.local.cfg
new file mode 100644
index 00000000000..5c02dd3614a
--- /dev/null
+++ b/llvm/test/tools/llvm-mca/SystemZ/lit.local.cfg
@@ -0,0 +1,3 @@
+if not 'SystemZ' in config.root.targets:
+    config.unsupported = True
+
diff --git a/llvm/test/tools/llvm-mca/SystemZ/stm-lm.s b/llvm/test/tools/llvm-mca/SystemZ/stm-lm.s
new file mode 100644
index 00000000000..5118635fff9
--- /dev/null
+++ b/llvm/test/tools/llvm-mca/SystemZ/stm-lm.s
@@ -0,0 +1,72 @@
+# NOTE: Assertions have been autogenerated by utils/update_mca_test_checks.py
+# RUN: llvm-mca -mtriple=s390x-linux-gnu -mcpu=z14 -timeline -timeline-max-iterations=3 < %s | FileCheck %s
+
+stmg	%r6, %r15, 48(%r15)
+lmg	%r6, %r15, 48(%r15)
+
+# CHECK:      Iterations:        100
+# CHECK-NEXT: Instructions:      200
+# CHECK-NEXT: Total Cycles:      1003
+# CHECK-NEXT: Total uOps:        600
+
+# CHECK:      Dispatch Width:    6
+# CHECK-NEXT: uOps Per Cycle:    0.60
+# CHECK-NEXT: IPC:               0.20
+# CHECK-NEXT: Block RThroughput: 3.5
+
+# 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:  3      1     1.50           *            stmg	%r6, %r15, 48(%r15)
+# CHECK-NEXT:  3      10    2.50    *                   lmg	%r6, %r15, 48(%r15)
+
+# CHECK:      Resources:
+# CHECK-NEXT: [0.0] - Z14_FXaUnit
+# CHECK-NEXT: [0.1] - Z14_FXaUnit
+# CHECK-NEXT: [1.0] - Z14_FXbUnit
+# CHECK-NEXT: [1.1] - Z14_FXbUnit
+# CHECK-NEXT: [2.0] - Z14_LSUnit
+# CHECK-NEXT: [2.1] - Z14_LSUnit
+# CHECK-NEXT: [3]   - Z14_MCD
+# CHECK-NEXT: [4.0] - Z14_VBUnit
+# CHECK-NEXT: [4.1] - Z14_VBUnit
+# CHECK-NEXT: [5.0] - Z14_VecFPdUnit
+# CHECK-NEXT: [5.1] - Z14_VecFPdUnit
+# CHECK-NEXT: [6.0] - Z14_VecUnit
+# CHECK-NEXT: [6.1] - Z14_VecUnit
+
+# CHECK:      Resource pressure per iteration:
+# CHECK-NEXT: [0.0]  [0.1]  [1.0]  [1.1]  [2.0]  [2.1]  [3]    [4.0]  [4.1]  [5.0]  [5.1]  [6.0]  [6.1]
+# CHECK-NEXT:  -      -     1.50   1.50   2.06   4.94    -      -      -      -      -      -      -
+
+# CHECK:      Resource pressure by instruction:
+# CHECK-NEXT: [0.0]  [0.1]  [1.0]  [1.1]  [2.0]  [2.1]  [3]    [4.0]  [4.1]  [5.0]  [5.1]  [6.0]  [6.1]  Instructions:
+# CHECK-NEXT:  -      -     1.50   1.50   1.96   0.04    -      -      -      -      -      -      -     stmg	%r6, %r15, 48(%r15)
+# CHECK-NEXT:  -      -      -      -     0.10   4.90    -      -      -      -      -      -      -     lmg	%r6, %r15, 48(%r15)
+
+# CHECK:      Timeline view:
+# CHECK-NEXT:                     0123456789          012
+# CHECK-NEXT: Index     0123456789          0123456789
+
+# CHECK:      [0,0]     DeER .    .    .    .    .    . .   stmg	%r6, %r15, 48(%r15)
+# CHECK-NEXT: [0,1]     DeeeeeeeeeeER  .    .    .    . .   lmg	%r6, %r15, 48(%r15)
+# CHECK-NEXT: [1,0]     .D=========eER .    .    .    . .   stmg	%r6, %r15, 48(%r15)
+# CHECK-NEXT: [1,1]     .D=========eeeeeeeeeeER  .    . .   lmg	%r6, %r15, 48(%r15)
+# CHECK-NEXT: [2,0]     . D==================eER .    . .   stmg	%r6, %r15, 48(%r15)
+# CHECK-NEXT: [2,1]     . D==================eeeeeeeeeeER   lmg	%r6, %r15, 48(%r15)
+
+# 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     10.0   0.3    0.0       stmg	%r6, %r15, 48(%r15)
+# CHECK-NEXT: 1.     3     10.0   0.3    0.0       lmg	%r6, %r15, 48(%r15)