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1; RUN: opt -O2 -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s2;3; Check that bpf-preserve-static-offset keeps track of 'inbounds' flags while4; folding chain of GEP instructions.5;6; Source (IR modified by hand):7; #define __ctx __attribute__((preserve_static_offset))8; 9; struct bar {10; int aa;11; int bb;12; };13; 14; struct foo {15; int a;16; struct bar b;17; } __ctx;18; 19; void buz(struct foo *p) {20; p->b.bb = 42;21; }22;23; Compilation flag:24; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \25; | opt -passes=function(sroa) -S -o -26;27; Modified to remove one of the 'inbounds' from one of the GEP instructions.28 29%struct.foo = type { i32, %struct.bar }30%struct.bar = type { i32, i32 }31 32; Function Attrs: nounwind33define dso_local void @buz(ptr noundef %p) #0 {34entry:35 %0 = call ptr @llvm.preserve.static.offset(ptr %p)36 %b = getelementptr inbounds %struct.foo, ptr %0, i32 0, i32 137 %bb = getelementptr %struct.bar, ptr %b, i32 0, i32 138 store i32 42, ptr %bb, align 4, !tbaa !239 ret void40}41 42; CHECK: define dso_local void @buz(ptr noundef writeonly captures(none) %[[p:.*]])43; CHECK: tail call void (i32, ptr, i1, i8, i8, i8, i1, ...)44; CHECK-SAME: @llvm.bpf.getelementptr.and.store.i3245; CHECK-SAME: (i32 42,46; CHECK-SAME: ptr writeonly elementtype(%struct.foo) %[[p]],47; CHECK-SAME: i1 false, i8 0, i8 1, i8 2, i1 false, i32 immarg 0, i32 immarg 1, i32 immarg 1)48; CHECK-SAME: #[[v2:.*]], !tbaa49; CHECK: attributes #[[v2]] = { memory(argmem: write) }50 51; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)52declare ptr @llvm.preserve.static.offset(ptr readnone) #153 54attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" }55attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }56 57!llvm.module.flags = !{!0}58!llvm.ident = !{!1}59 60!0 = !{i32 1, !"wchar_size", i32 4}61!1 = !{!"clang"}62!2 = !{!3, !4, i64 8}63!3 = !{!"foo", !4, i64 0, !7, i64 4}64!4 = !{!"int", !5, i64 0}65!5 = !{!"omnipotent char", !6, i64 0}66!6 = !{!"Simple C/C++ TBAA"}67!7 = !{!"bar", !4, i64 0, !4, i64 4}68