[llvm] [AMDGPU] Skip debug uses in SIPeepholeSDWA (PR #160092)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Jay Foad (jayfoad)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/160092.diff


2 Files Affected:

- (modified) llvm/lib/Target/AMDGPU/SIPeepholeSDWA.cpp (+2-1) 
- (modified) llvm/test/CodeGen/AMDGPU/v_add_u64_pseudo_sdwa.ll (+2-4) 


``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIPeepholeSDWA.cpp b/llvm/lib/Target/AMDGPU/SIPeepholeSDWA.cpp
index 857cb91a977f3..afe76e1ca74f2 100644
--- a/llvm/lib/Target/AMDGPU/SIPeepholeSDWA.cpp
+++ b/llvm/lib/Target/AMDGPU/SIPeepholeSDWA.cpp
@@ -1029,7 +1029,8 @@ void SIPeepholeSDWA::pseudoOpConvertToVOP2(MachineInstr &MI,
   MachineOperand *CarryOut = TII->getNamedOperand(MISucc, AMDGPU::OpName::sdst);
   if (!CarryOut)
     return;
-  if (!MRI->hasOneUse(CarryIn->getReg()) || !MRI->use_empty(CarryOut->getReg()))
+  if (!MRI->hasOneNonDBGUse(CarryIn->getReg()) ||
+      !MRI->use_nodbg_empty(CarryOut->getReg()))
     return;
   // Make sure VCC or its subregs are dead before MI.
   MachineBasicBlock &MBB = *MI.getParent();
diff --git a/llvm/test/CodeGen/AMDGPU/v_add_u64_pseudo_sdwa.ll b/llvm/test/CodeGen/AMDGPU/v_add_u64_pseudo_sdwa.ll
index f95bc0b2f1cb6..d56f1f321371d 100644
--- a/llvm/test/CodeGen/AMDGPU/v_add_u64_pseudo_sdwa.ll
+++ b/llvm/test/CodeGen/AMDGPU/v_add_u64_pseudo_sdwa.ll
@@ -1,5 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=amdgcn -mcpu=gfx900 < %s | FileCheck -check-prefixes=GFX9 %s
+; RUN: llc -mtriple=amdgcn -mcpu=gfx900 < %s -debugify-and-strip-all-safe | FileCheck -check-prefixes=GFX9 %s
+
 define amdgpu_kernel void @sdwa_test() local_unnamed_addr #0 {
 ; GFX9-LABEL: sdwa_test:
 ; GFX9:       ; %bb.0: ; %bb
@@ -21,7 +23,6 @@ bb:
   ret void
 }
 
-
 define amdgpu_kernel void @test_add_co_sdwa(ptr addrspace(1) %arg, ptr addrspace(1) %arg1) #0 {
 ; GFX9-LABEL: test_add_co_sdwa:
 ; GFX9:       ; %bb.0: ; %bb
@@ -48,6 +49,3 @@ bb:
   store i64 %tmp9, ptr addrspace(1) %tmp7, align 8
   ret void
 }
-
-
-declare i32 @llvm.amdgcn.workitem.id.x()

``````````

</details>


https://github.com/llvm/llvm-project/pull/160092