[PATCH] D125060: [amdgpu] Implement lds kernel id intrinsic

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added inline comments.


================
Comment at: llvm/lib/Target/AMDGPU/SIFrameLowering.cpp:530-536
+  if (MFI->hasLDSKernelId()) {
+    ConstantInt *Id = AMDGPUMachineFunction::getLDSKernelIdMetadata(F);
+    Register Reg = MFI->getPreloadedReg(AMDGPUFunctionArgInfo::LDS_KERNEL_ID);      
+    if (Id && Reg) {
+      BuildMI(MBB, I, DL, TII->get(AMDGPU::S_MOV_B32), Reg)
+        .addImm(Id->getZExtValue());
+    }
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arsenm wrote:
> This shouldn't get initialized in frame lowering. This should have been emitted as an outgoing call argument only, this isn't a reserved register
The value chosen is also likely clobbering an incoming user sgpr


Repository:
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  https://reviews.llvm.org/D125060/new/

https://reviews.llvm.org/D125060