[llvm] [AMDGPU] Change isSingleLaneExecution to account for WWM enabling lanes even if there's only one workitem (PR #188316)

[Matt Arsenault via llvm-commits]

================
@@ -0,0 +1,108 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-attributes --check-globals all --version 5
+; Test the generation of the attribute amdgpu-no-wwm
+; RUN: opt -S -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -passes=amdgpu-attributor < %s | FileCheck -check-prefixes=GFX9 %s
+; RUN: opt -S -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1010 -passes=amdgpu-attributor < %s | FileCheck -check-prefixes=GFX10 %s
+; RUN: opt -S -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1100 -passes=amdgpu-attributor < %s | FileCheck -check-prefixes=GFX11 %s
+; RUN: opt -S -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1200 -passes=amdgpu-attributor < %s | FileCheck -check-prefixes=GFX12 %s
+
+define amdgpu_kernel void @test_no_wwm(i32 %input, ptr addrspace(1) %out) {
+; GFX9-LABEL: define amdgpu_kernel void @test_no_wwm(
+; GFX9-SAME: i32 [[INPUT:%.*]], ptr addrspace(1) [[OUT:%.*]]) #[[ATTR0:[0-9]+]] {
+; GFX9-NEXT:    store i32 [[INPUT]], ptr addrspace(1) [[OUT]], align 4
+; GFX9-NEXT:    ret void
+;
+; GFX10-LABEL: define amdgpu_kernel void @test_no_wwm(
+; GFX10-SAME: i32 [[INPUT:%.*]], ptr addrspace(1) [[OUT:%.*]]) #[[ATTR0:[0-9]+]] {
+; GFX10-NEXT:    store i32 [[INPUT]], ptr addrspace(1) [[OUT]], align 4
+; GFX10-NEXT:    ret void
+;
+; GFX11-LABEL: define amdgpu_kernel void @test_no_wwm(
+; GFX11-SAME: i32 [[INPUT:%.*]], ptr addrspace(1) [[OUT:%.*]]) #[[ATTR0:[0-9]+]] {
+; GFX11-NEXT:    store i32 [[INPUT]], ptr addrspace(1) [[OUT]], align 4
+; GFX11-NEXT:    ret void
+;
+; GFX12-LABEL: define amdgpu_kernel void @test_no_wwm(
+; GFX12-SAME: i32 [[INPUT:%.*]], ptr addrspace(1) [[OUT:%.*]]) #[[ATTR0:[0-9]+]] {
+; GFX12-NEXT:    store i32 [[INPUT]], ptr addrspace(1) [[OUT]], align 4
+; GFX12-NEXT:    ret void
+;
+  store i32 %input, ptr addrspace(1) %out
+  ret void
+}
+
----------------
arsenm wrote:

Check a call works? 

https://github.com/llvm/llvm-project/pull/188316