1; RUN: opt -O2 -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s 2; 3; Check handling of a simple store instruction by bpf-preserve-static-offset. 4; Verify: 5; - presence of gep.and.store intrinsic call 6; - correct attributes for intrinsic call 7; - presence of tbaa annotations 8; 9; Source: 10; #define __ctx __attribute__((preserve_static_offset)) 11; 12; struct foo { 13; int _; 14; int a; 15; } __ctx; 16; 17; void bar(struct foo *p) { 18; p->a = 7; 19; } 20; 21; Compilation flag: 22; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \ 23; | opt -passes=function(sroa) -S -o - 24 25%struct.foo = type { i32, i32 } 26 27; Function Attrs: nounwind 28define dso_local void @bar(ptr noundef %p) #0 { 29entry: 30 %0 = call ptr @llvm.preserve.static.offset(ptr %p) 31 %a = getelementptr inbounds %struct.foo, ptr %0, i32 0, i32 1 32 store i32 7, ptr %a, align 4, !tbaa !2 33 ret void 34} 35 36; CHECK: define dso_local void @bar(ptr noundef writeonly captures(none) %[[p:.*]]) 37; CHECK: tail call void (i32, ptr, i1, i8, i8, i8, i1, ...) 38; CHECK-SAME: @llvm.bpf.getelementptr.and.store.i32 39; CHECK-SAME: (i32 7, 40; CHECK-SAME: ptr writeonly elementtype(%struct.foo) %[[p]], 41; CHECK-SAME: i1 false, i8 0, i8 1, i8 2, i1 true, i32 immarg 0, i32 immarg 1) 42; CHECK-SAME: #[[v2:.*]], !tbaa 43; CHECK: attributes #[[v2]] = { memory(argmem: write) } 44 45; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none) 46declare ptr @llvm.preserve.static.offset(ptr readnone) #1 47 48attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 49attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) } 50 51!llvm.module.flags = !{!0} 52!llvm.ident = !{!1} 53 54!0 = !{i32 1, !"wchar_size", i32 4} 55!1 = !{!"clang"} 56!2 = !{!3, !4, i64 4} 57!3 = !{!"foo", !4, i64 0, !4, i64 4} 58!4 = !{!"int", !5, i64 0} 59!5 = !{!"omnipotent char", !6, i64 0} 60!6 = !{!"Simple C/C++ TBAA"} 61