1; RUN: opt -O2 -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s 2; 3; Check handling of a volatile store instruction by bpf-preserve-static-offset. 4; 5; Source: 6; #define __ctx __attribute__((preserve_static_offset)) 7; 8; struct foo { 9; int a; 10; volatile int b; 11; } __ctx; 12; 13; void bar(struct foo *p) { 14; p->b = 42; 15; } 16; 17; Compilation flag: 18; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \ 19; | opt -passes=function(sroa) -S -o - 20 21%struct.foo = type { i32, i32 } 22 23; Function Attrs: nounwind 24define dso_local void @bar(ptr noundef %p) #0 { 25entry: 26 %0 = call ptr @llvm.preserve.static.offset(ptr %p) 27 %b = getelementptr inbounds %struct.foo, ptr %0, i32 0, i32 1 28 store volatile i32 42, ptr %b, align 4, !tbaa !2 29 ret void 30} 31 32; CHECK: define dso_local void @bar(ptr noundef captures(none) %[[p:.*]]) 33; CHECK: tail call void (i32, ptr, i1, i8, i8, i8, i1, ...) 34; CHECK-SAME: @llvm.bpf.getelementptr.and.store.i32 35; CHECK-SAME: (i32 42, 36; CHECK-SAME: ptr elementtype(%struct.foo) %[[p]], 37; CHECK-SAME: i1 true, i8 0, i8 1, i8 2, i1 true, i32 immarg 0, i32 immarg 1), 38; CHECK-NOT: #{{[0-9]+}} 39; CHECK-SAME: !tbaa 40 41; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none) 42declare ptr @llvm.preserve.static.offset(ptr readnone) #1 43 44attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 45attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) } 46 47!llvm.module.flags = !{!0} 48!llvm.ident = !{!1} 49 50!0 = !{i32 1, !"wchar_size", i32 4} 51!1 = !{!"clang"} 52!2 = !{!3, !4, i64 4} 53!3 = !{!"foo", !4, i64 0, !4, i64 4} 54!4 = !{!"int", !5, i64 0} 55!5 = !{!"omnipotent char", !6, i64 0} 56!6 = !{!"Simple C/C++ TBAA"} 57