[llvm] [NFC][PowerPC] Add test to check lanemasks for subregisters. (PR #94363)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-powerpc

Author: Stefan Pintilie (stefanp-ibm)

<details>
<summary>Changes</summary>


This change adds a test case to check the lane masks for a varitey of
subregisters.


---
Full diff: https://github.com/llvm/llvm-project/pull/94363.diff


1 Files Affected:

- (added) llvm/test/CodeGen/PowerPC/subreg-lanemasks.mir (+67) 


``````````diff
diff --git a/llvm/test/CodeGen/PowerPC/subreg-lanemasks.mir b/llvm/test/CodeGen/PowerPC/subreg-lanemasks.mir
new file mode 100644
index 0000000000000..e0bef0ece116e
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/subreg-lanemasks.mir
@@ -0,0 +1,67 @@
+# RUN: llc -mcpu=pwr10 -O3 -ppc-track-subreg-liveness -verify-machineinstrs \
+# RUN:   -mtriple=powerpc64le-unknown-linux-gnu -run-pass=greedy,virtregrewriter \
+# RUN:   -debug-only=regalloc -o - %s 2>&1 >/dev/null | FileCheck %s
+
+# Keep track of all of the lanemasks for various subregsiters.
+#
+# TODO: The mask for %6.sub_vsx1:accrc is the same as the mask for %10.sub_vsx1_then_sub_64:accrc
+#       even though one is a 128 bit register and the other is a 64 bit subregister. This should
+#       be fixed in a later patch.
+#
+# CHECK: %3 [80r,80d:0) 0 at 80r  L0000000000000004 [80r,80d:0) 0 at 80r  weight:0.000000e+00
+# CHECK: %4 [96r,96d:0) 0 at 96r  L0000000000000800 [96r,96d:0) 0 at 96r  weight:0.000000e+00
+# CHECK: %5 [112r,112d:0) 0 at 112r  L0000000000000004 [112r,112d:0) 0 at 112r  weight:0.000000e+00
+# CHECK: %6 [128r,128d:0) 0 at 128r  L0000000000000800 [128r,128d:0) 0 at 128r  weight:0.000000e+00
+# CHECK: %7 [144r,144d:0) 0 at 144r  L0000000000000004 [144r,144d:0) 0 at 144r  weight:0.000000e+00
+# CHECK: %8 [160r,160d:0) 0 at 160r  L0000000000000800 [160r,160d:0) 0 at 160r  weight:0.000000e+00
+# CHECK: %9 [176r,176d:0) 0 at 176r  L0000000000000004 [176r,176d:0) 0 at 176r  weight:0.000000e+00
+# CHECK: %10 [192r,192d:0) 0 at 192r  L0000000000000800 [192r,192d:0) 0 at 192r  weight:0.000000e+00
+# CHECK: %11 [208r,208d:0) 0 at 208r  L0000000000001000 [208r,208d:0) 0 at 208r  weight:0.000000e+00
+# CHECK: %12 [224r,224d:0) 0 at 224r  L0000000000002000 [224r,224d:0) 0 at 224r  weight:0.000000e+00
+# CHECK: %13 [240r,240d:0) 0 at 240r  L0000000000000804 [240r,240d:0) 0 at 240r  weight:0.000000e+00
+# CHECK: %14 [256r,256d:0) 0 at 256r  L0000000000003000 [256r,256d:0) 0 at 256r  weight:0.000000e+00
+
+
+# CHECK:       0B bb.0
+# CHECK-NEXT:    liveins
+# CHECK-NEXT:  16B  %0:vsrc = COPY $v2
+# CHECK-NEXT:  32B  %float:fprc = COPY %0.sub_64:vsrc
+# CHECK-NEXT:  48B  dead undef %pair.sub_vsx0:vsrprc = COPY $v2
+# CHECK-NEXT:  64B  undef %15.sub_vsx1:vsrprc = COPY $v3
+# CHECK-NEXT:  80B  dead undef %3.sub_vsx0:vsrprc = COPY %0:vsrc
+# CHECK-NEXT:  96B  dead undef %4.sub_vsx1:vsrprc = COPY %0:vsrc
+# CHECK-NEXT:  112B  dead undef %5.sub_vsx0:accrc = COPY %0:vsrc
+# CHECK-NEXT:  128B  dead undef %6.sub_vsx1:accrc = COPY %0:vsrc
+# CHECK-NEXT:  144B  dead undef %7.sub_64:vsrprc = COPY %float:fprc
+# CHECK-NEXT:  160B  dead undef %8.sub_vsx1_then_sub_64:vsrprc = COPY %float:fprc
+# CHECK-NEXT:  176B  dead undef %9.sub_64:accrc = COPY %float:fprc
+# CHECK-NEXT:  192B  dead undef %10.sub_vsx1_then_sub_64:accrc = COPY %float:fprc
+# CHECK-NEXT:  208B  dead undef %11.sub_pair1_then_sub_64:accrc = COPY %float:fprc
+# CHECK-NEXT:  224B  dead undef %12.sub_pair1_then_sub_vsx1_then_sub_64:accrc = COPY %float:fprc
+# CHECK-NEXT:  240B  dead undef %13.sub_pair0:accrc = COPY %15:vsrprc
+# CHECK-NEXT:  256B  dead undef %14.sub_pair1:accrc = COPY %15:vsrprc
+
+
+---
+name:            test
+tracksRegLiveness: true
+body:             |
+  bb.0:
+    liveins: $v2, $v3
+    %0:vsrc = COPY $v2
+    %float:fprc = COPY %0.sub_64
+    undef %pair.sub_vsx0:vsrprc = COPY $v2
+    undef %pair.sub_vsx1:vsrprc = COPY $v3
+    undef %1.sub_vsx0:vsrprc = COPY %0
+    undef %2.sub_vsx1:vsrprc = COPY %0
+    undef %3.sub_vsx0:accrc = COPY %0
+    undef %4.sub_vsx1:accrc = COPY %0
+    undef %5.sub_64:vsrprc = COPY %float
+    undef %6.sub_vsx1_then_sub_64:vsrprc = COPY %float
+    undef %7.sub_64:accrc = COPY %float
+    undef %8.sub_vsx1_then_sub_64:accrc = COPY %float
+    undef %9.sub_pair1_then_sub_64:accrc = COPY %float
+    undef %10.sub_pair1_then_sub_vsx1_then_sub_64:accrc = COPY %float
+    undef %11.sub_pair0:accrc = COPY %pair
+    undef %12.sub_pair1:accrc = COPY %pair
+...

``````````

</details>


https://github.com/llvm/llvm-project/pull/94363