Bitcast in StatelessToStateful pass

The fix prevents crash in StatelessToStateful pass
if all ptr usees are bitcast instructions.

Author: ViacheslavRb

IGC/Compiler/Optimizer/OpenCLPasses/StatelessToStateful/StatelessToStateful.cpp

@@ -522,7 +522,7 @@ bool StatelessToStateful::pointerIsFromKernelArgument(Value &ptr) {
 
 static alignment_t determinePointerAlignment(Value *Ptr, const DataLayout &DL, AssumptionCache *AC,
                                              Instruction *InsertionPt) {
-  alignment_t BestAlign = 0;
+  alignment_t BestAlign = 1;
 
   // 1) Examine uses: look for loads/stores (which may carry explicit
   //    alignment) or a GEP that reveals an ABI alignment from its element

IGC/Compiler/tests/StatelessToStateful/Bindful/bufferOffset/ptr_bitcast-typed-pointers.ll

@@ -0,0 +1,44 @@
+;=========================== begin_copyright_notice ============================
+;
+; Copyright (C) 2025 Intel Corporation
+;
+; SPDX-License-Identifier: MIT
+;
+;============================ end_copyright_notice =============================
+
+; RUN: igc_opt --typed-pointers %s -S -o - -igc-stateless-to-stateful-resolution -igc-serialize-metadata -platformpvc | FileCheck %s
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v16:16:16-v24:32:32-v32:32:32-v48:64:64-v64:64:64-v96:128:128-v128:128:128-v192:256:256-v256:256:256-v512:512:512-v1024:1024:1024-n8:16:32"
+
+define spir_kernel void @test(i64 addrspace(1)* %dst, i32 %bufferOffset) {
+entry:
+  ; CHECK: %[[OFFSET:[0-9]+]] = add i32 %bufferOffset, 1
+  ; CHECK: %[[PTR:[0-9]+]] = inttoptr i32 %[[OFFSET]] to i8 addrspace(131072)*
+  ; CHECK: store i8 0, i8 addrspace(131072)* %[[PTR]], align 1
+  %bc = bitcast i64 addrspace(1)* %dst to i8 addrspace(1)*
+  %ptr = getelementptr inbounds i8, i8 addrspace(1)* %bc, i64 1
+  store i8 0, i8 addrspace(1)* %ptr, align 1
+  ret void
+}
+
+!IGCMetadata = !{!0}
+!igc.functions = !{!1}
+
+!0 = !{!"ModuleMD", !5, !16}
+!1 = !{void (i64 addrspace(1)*, i32)* @test, !2}
+!2 = !{!3, !14}
+!3 = !{!"function_type", i32 0}
+!4 = !{}
+!5 = !{!"FuncMD", !6, !7}
+!6 = !{!"FuncMDMap[0]", void (i64 addrspace(1)*, i32)* @test}
+!7 = !{!"FuncMDValue[0]", !8}
+!8 = !{!"resAllocMD", !9}
+!9 = !{!"argAllocMDList", !10}
+!10 = !{!"argAllocMDListVec[0]", !11}
+!11 = !{!"type", i32 1}
+!12 = !{!"extensionType", i32 -1}
+!13 = !{!"indexType", i32 0}
+!14 = !{!"implicit_arg_desc", !15}
+!15 = !{i32 15}
+!16 = !{!"compOpt", !17}
+!17 = !{!"HasBufferOffsetArg", i1 true}

IGC/Compiler/tests/StatelessToStateful/Bindful/bufferOffset/ptr_bitcast.ll

@@ -0,0 +1,41 @@
+;=========================== begin_copyright_notice ============================
+;
+; Copyright (C) 2025 Intel Corporation
+;
+; SPDX-License-Identifier: MIT
+;
+;============================ end_copyright_notice =============================
+
+; RUN: igc_opt --opaque-pointers %s -S -o - -igc-stateless-to-stateful-resolution -igc-serialize-metadata -platformpvc | FileCheck %s
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v16:16:16-v24:32:32-v32:32:32-v48:64:64-v64:64:64-v96:128:128-v128:128:128-v192:256:256-v256:256:256-v512:512:512-v1024:1024:1024-n8:16:32"
+
+define spir_kernel void @test(ptr addrspace(1) %dst, i32 %bufferOffset) {
+entry:
+; CHECK: %[[OFFSET:[0-9]+]] = add i32 %bufferOffset, 1
+; CHECK: %[[PTR:[0-9]+]] = inttoptr i32 %[[OFFSET]] to ptr addrspace(131072)
+; CHECK: store i8 0, ptr addrspace(131072) %[[PTR]], align 1
+  %bc = bitcast ptr addrspace(1) %dst to ptr addrspace(1)
+  %ptr = getelementptr inbounds i8, ptr addrspace(1) %bc, i64 1
+  store i8 0, ptr addrspace(1) %ptr, align 1
+  ret void
+}
+
+!IGCMetadata = !{!0}
+!igc.functions = !{!10}
+
+!0 = !{!"ModuleMD", !1, !8}
+!1 = !{!"FuncMD", !2, !3}
+!2 = !{!"FuncMDMap[0]", ptr @test}
+!3 = !{!"FuncMDValue[0]", !4}
+!4 = !{!"resAllocMD", !5}
+!5 = !{!"argAllocMDList", !6}
+!6 = !{!"argAllocMDListVec[0]", !7}
+!7 = !{!"type", i32 1}
+!8 = !{!"compOpt", !9}
+!9 = !{!"HasBufferOffsetArg", i1 true}
+!10 = !{ptr @test, !11}
+!11 = !{!12, !13}
+!12 = !{!"function_type", i32 0}
+!13 = !{!"implicit_arg_desc", !14}
+!14 = !{i32 15}