[PATCH] D135331: [AMDGPU] Add test coverage to ensure first regallocfast only allocates SGPR

[Jeffrey Byrnes via Phabricator via llvm-commits]

jrbyrnes created this revision.
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Register allocation is split into two passes, and the expected behavior is that the first pass only should only work on virtual SGPRs. Whereas the second pass works on virtual VGPRs. This adds a test case which breaks if the first pass allocates VGPRs.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D135331

Files:
  llvm/test/CodeGen/AMDGPU/fastregalloc-sgpr-only.mir


Index: llvm/test/CodeGen/AMDGPU/fastregalloc-sgpr-only.mir
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/AMDGPU/fastregalloc-sgpr-only.mir
@@ -0,0 +1,17 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -verify-machineinstrs -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -O0 -start-before=regallocfast -stop-after=regallocfast -o - %s | FileCheck -check-prefix=GCN %s
+
+---
+name: copy_not_allocated
+tracksRegLiveness: true
+body:             |
+  bb.0:
+    liveins: $vgpr0, $vgpr1, $vgpr4, $vgpr5
+    ; GCN-LABEL: name: copy_not_allocated
+    ; GCN: liveins: $vgpr0, $vgpr1, $vgpr4, $vgpr5
+    ; GCN-NEXT: {{  $}}
+    ; GCN-NEXT: [[COPY:%[0-9]+]]:vreg_64 = COPY killed $vgpr0_vgpr1
+    ; GCN-NEXT: FLAT_STORE_DWORDX2 killed $vgpr4_vgpr5, [[COPY]], 0, 0, implicit $exec, implicit $flat_scr
+    %14:vreg_64 = COPY $vgpr0_vgpr1
+    FLAT_STORE_DWORDX2 $vgpr4_vgpr5, %14:vreg_64, 0, 0, implicit $exec, implicit $flat_scr
+...


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