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1; RUN: opt --bpf-check-and-opt-ir -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s2;3; Check unroll of getelementptr.and.store when direct memory offset is4; used instead of field indexes.5;6; Source:7; #define __ctx __attribute__((preserve_static_offset))8; 9; struct foo {10; char aa;11; char bb;12; };13; 14; struct bar {15; char a;16; struct foo b;17; } __ctx;18; 19; void buz(struct bar *p) {20; ((struct foo *)(((char*)&p->b) + 1))->bb = 42;21; }22;23; Compilation flag:24; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \25; | opt -passes=sroa,bpf-preserve-static-offset -S -o -26 27; Function Attrs: nounwind28define dso_local void @buz(ptr noundef %p) #0 {29entry:30 call void (i8, ptr, i1, i8, i8, i8, i1, ...)31 @llvm.bpf.getelementptr.and.store.i832 (i8 42,33 ptr writeonly elementtype(i8) %p,34 i1 false, i8 0, i8 1, i8 0, i1 true, i64 immarg 3)35 #3, !tbaa !236 ret void37}38 39; CHECK: define dso_local void @buz(ptr noundef %[[p:.*]])40; CHECK: %[[v2:.*]] = getelementptr inbounds i8, ptr %[[p]], i64 341; CHECK: store i8 42, ptr %[[v2]], align 142 43; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)44declare ptr @llvm.preserve.static.offset(ptr readnone) #145 46; Function Attrs: nocallback nofree nounwind willreturn47declare void @llvm.bpf.getelementptr.and.store.i8(i8, ptr nocapture, i1 immarg, i8 immarg, i8 immarg, i8 immarg, i1 immarg, ...) #248 49attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" }50attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }51attributes #2 = { nocallback nofree nounwind willreturn }52attributes #3 = { memory(argmem: write) }53 54!llvm.module.flags = !{!0}55!llvm.ident = !{!1}56 57!0 = !{i32 1, !"wchar_size", i32 4}58!1 = !{!"clang"}59!2 = !{!3, !4, i64 1}60!3 = !{!"foo", !4, i64 0, !4, i64 1}61!4 = !{!"omnipotent char", !5, i64 0}62!5 = !{!"Simple C/C++ TBAA"}63