1; RUN: opt -O2 -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s 2; 3; Check that bpf-preserve-static-offset folds chain of GEP instructions. 4; 5; Source: 6; #define __ctx __attribute__((preserve_static_offset)) 7; 8; struct bar { 9; int aa; 10; int bb; 11; }; 12; 13; struct foo { 14; int a; 15; struct bar b; 16; } __ctx; 17; 18; void buz(struct foo *p) { 19; p->b.bb = 42; 20; } 21; 22; Compilation flag: 23; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \ 24; | opt -passes=function(sroa) -S -o - 25 26%struct.foo = type { i32, %struct.bar } 27%struct.bar = type { i32, i32 } 28 29; Function Attrs: nounwind 30define dso_local void @buz(ptr noundef %p) #0 { 31entry: 32 %0 = call ptr @llvm.preserve.static.offset(ptr %p) 33 %b = getelementptr inbounds %struct.foo, ptr %0, i32 0, i32 1 34 %bb = getelementptr inbounds %struct.bar, ptr %b, i32 0, i32 1 35 store i32 42, ptr %bb, align 4, !tbaa !2 36 ret void 37} 38 39; CHECK: define dso_local void @buz(ptr noundef writeonly captures(none) %[[p:.*]]) 40; CHECK: tail call void (i32, ptr, i1, i8, i8, i8, i1, ...) 41; CHECK-SAME: @llvm.bpf.getelementptr.and.store.i32 42; CHECK-SAME: (i32 42, 43; CHECK-SAME: ptr writeonly elementtype(%struct.foo) %[[p]], 44; CHECK-SAME: i1 false, i8 0, i8 1, i8 2, i1 true, i32 immarg 0, i32 immarg 1, i32 immarg 1) 45; CHECK-SAME: #[[v2:.*]], !tbaa 46; CHECK: attributes #[[v2]] = { memory(argmem: write) } 47 48; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none) 49declare ptr @llvm.preserve.static.offset(ptr readnone) #1 50 51attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 52attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) } 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 8} 60!3 = !{!"foo", !4, i64 0, !7, i64 4} 61!4 = !{!"int", !5, i64 0} 62!5 = !{!"omnipotent char", !6, i64 0} 63!6 = !{!"Simple C/C++ TBAA"} 64!7 = !{!"bar", !4, i64 0, !4, i64 4} 65