[clang] [llvm] [AMDGPU] Emit a waitcnt instruction after each memory instruction (PR #79236)

[Jun Wang via cfe-commits]

================
@@ -0,0 +1,618 @@
+; RUN: llc -mtriple=amdgcn -mcpu=gfx900 -mattr=+precise-memory < %s | FileCheck %s -check-prefixes=GFX9
+; RUN: llc -mtriple=amdgcn -mcpu=gfx90a -mattr=+precise-memory < %s | FileCheck %s -check-prefixes=GFX90A
+; RUN: llc -mtriple=amdgcn -mcpu=gfx1010 -mattr=+precise-memory < %s | FileCheck %s -check-prefixes=GFX10
+; RUN: llc -mtriple=amdgcn -mcpu=gfx900 -mattr=+enable-flat-scratch,+precise-memory < %s | FileCheck --check-prefixes=GFX9-FLATSCR %s
+; RUN: llc -mtriple=amdgcn -mcpu=gfx1100 -mattr=+precise-memory < %s | FileCheck %s -check-prefixes=GFX11
+; RUN: llc -mtriple=amdgcn -mcpu=gfx1200 -mattr=+precise-memory < %s | FileCheck %s -check-prefixes=GFX12
+
+; from atomicrmw-expand.ll
+; covers flat_load, flat_atomic (atomic with return)
+;
+; GFX90A-LABEL: syncscope_workgroup_nortn:
----------------
jwanggit86 wrote:

Done.

https://github.com/llvm/llvm-project/pull/79236