[llvm] [AMDGPU] Inplace FI elimination during PEI for scalar copy instruction (PR #99556)

[Christudasan Devadasan via llvm-commits]

================
@@ -0,0 +1,176 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
+# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx90a -verify-machineinstrs -run-pass=prologepilog %s -o - | FileCheck %s
+--- |
+  target triple = "amdgcn-amd-amdhsa"
+
+  declare double @killer()
+  define void @bug() #0 {
+    ret void
+  }
+
+  attributes #0 = { "amdgpu-stack-objects" "target-cpu"="gfx90a" }
+
+...
+---
+name:            bug
+tracksRegLiveness: true
+frameInfo:
+  maxAlignment:    8
+  adjustsStack:    true
+  hasCalls:        true
+stack:
+  - { id: 0, name: '', type: default, offset: 0, size: 4, alignment: 4,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
+      local-offset: 0, debug-info-variable: '', debug-info-expression: '',
+      debug-info-location: '' }
+  - { id: 1, name: '', type: default, offset: 4, size: 4, alignment: 4,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
+      local-offset: 4, debug-info-variable: '', debug-info-expression: '',
+      debug-info-location: '' }
+  - { id: 2, name: '', type: default, offset: 8, size: 4, alignment: 4,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
+      local-offset: 8, debug-info-variable: '', debug-info-expression: '',
+      debug-info-location: '' }
+  - { id: 3, name: '', type: default, offset: 12, size: 4, alignment: 4,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
+      local-offset: 12, debug-info-variable: '', debug-info-expression: '',
+      debug-info-location: '' }
+  - { id: 4, name: '', type: default, offset: 16, size: 4, alignment: 4,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
+      local-offset: 16, debug-info-variable: '', debug-info-expression: '',
+      debug-info-location: '' }
+  - { id: 5, name: '', type: default, offset: 20, size: 4, alignment: 4,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
+      local-offset: 20, debug-info-variable: '', debug-info-expression: '',
+      debug-info-location: '' }
+  - { id: 6, name: '', type: default, offset: 24, size: 8, alignment: 8,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
+      local-offset: 24, debug-info-variable: '', debug-info-expression: '',
+      debug-info-location: '' }
+  - { id: 7, name: '', type: spill-slot, offset: 32, size: 4, alignment: 4,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+  - { id: 8, name: '', type: spill-slot, offset: 36, size: 8, alignment: 4,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+  - { id: 9, name: '', type: spill-slot, offset: 44, size: 4, alignment: 4,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+  - { id: 10, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4,
+      stack-id: sgpr-spill, callee-saved-register: '', callee-saved-restored: true,
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+  - { id: 11, name: '', type: spill-slot, offset: 48, size: 4, alignment: 4,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+  - { id: 12, name: '', type: default, offset: 52, size: 4, alignment: 4,
+      stack-id: default, callee-saved-register: '', callee-saved-restored: true,
+      debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
----------------
cdevadas wrote:

Remove the unused FIs from here. Also, use the one starting from 0 in the test. You currently used 14, 15 & 16.

https://github.com/llvm/llvm-project/pull/99556