Add a test for poison/undef folds.

Author: ritter-x2a

llvm/test/CodeGen/AMDGPU/ptradd-sdag-undef-poison.ll

@@ -0,0 +1,49 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx942 -start-before=amdgpu-isel -amdgpu-use-sdag-ptradd=1 < %s | FileCheck --check-prefixes=GFX942,GFX942_PTRADD %s
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx942 -start-before=amdgpu-isel -amdgpu-use-sdag-ptradd=0 < %s | FileCheck --check-prefixes=GFX942,GFX942_LEGACY %s
+
+; Tests for undef and poison DAG folds for the ISD::PTRADD SelectionDAG opcode.
+; If any additions are generated for these tests, the folds don't work.
+
+define ptr @poison_offset(ptr %p, i64 %offset) {
+; GFX942-LABEL: poison_offset:
+; GFX942:       ; %bb.0:
+; GFX942-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX942-NEXT:    v_mov_b32_e32 v1, 0
+; GFX942-NEXT:    s_setpc_b64 s[30:31]
+  %gep1 = getelementptr i8, ptr %p, i64 poison
+  ret ptr %gep1
+}
+
+define ptr @poison_base(ptr %p, i64 %offset) {
+; GFX942-LABEL: poison_base:
+; GFX942:       ; %bb.0:
+; GFX942-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX942-NEXT:    v_mov_b32_e32 v1, 0
+; GFX942-NEXT:    s_setpc_b64 s[30:31]
+  %gep1 = getelementptr i8, ptr poison, i64 %offset
+  ret ptr %gep1
+}
+
+define ptr @undef_offset(ptr %p, i64 %offset) {
+; GFX942-LABEL: undef_offset:
+; GFX942:       ; %bb.0:
+; GFX942-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX942-NEXT:    v_mov_b32_e32 v1, 0
+; GFX942-NEXT:    s_setpc_b64 s[30:31]
+  %gep1 = getelementptr i8, ptr %p, i64 undef
+  ret ptr %gep1
+}
+
+define ptr @undef_base(ptr %p, i64 %offset) {
+; GFX942-LABEL: undef_base:
+; GFX942:       ; %bb.0:
+; GFX942-NEXT:    s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
+; GFX942-NEXT:    v_mov_b32_e32 v1, 0
+; GFX942-NEXT:    s_setpc_b64 s[30:31]
+  %gep1 = getelementptr i8, ptr undef, i64 %offset
+  ret ptr %gep1
+}
+;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
+; GFX942_LEGACY: {{.*}}
+; GFX942_PTRADD: {{.*}}