1; RUN: opt -passes=bpf-preserve-static-offset -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s 2; 3; Check handling of a volatile load instruction by bpf-preserve-static-offset. 4; 5; Source: 6; #define __ctx __attribute__((preserve_static_offset)) 7; 8; struct foo { 9; int _; 10; volatile int a; 11; } __ctx; 12; 13; extern void consume(int); 14; 15; void bar(struct foo *p) { 16; consume(p->a); 17; } 18; 19; Compilation flag: 20; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \ 21; | opt -passes=function(sroa) -S -o - 22 23%struct.foo = type { i32, i32 } 24 25; Function Attrs: nounwind 26define dso_local void @bar(ptr noundef %p) #0 { 27entry: 28 %0 = call ptr @llvm.preserve.static.offset(ptr %p) 29 %a = getelementptr inbounds %struct.foo, ptr %0, i32 0, i32 1 30 %1 = load volatile i32, ptr %a, align 4, !tbaa !2 31 call void @consume(i32 noundef %1) 32 ret void 33} 34 35; CHECK: %[[a1:.*]] = call i32 (ptr, i1, i8, i8, i8, i1, ...) 36; CHECK-SAME: @llvm.bpf.getelementptr.and.load.i32 37; CHECK-SAME: (ptr elementtype(%struct.foo) %{{[^,]+}}, 38; CHECK-SAME: i1 true, i8 0, i8 1, i8 2, i1 true, i32 immarg 0, i32 immarg 1) 39; ^^^^^^^^ 40; volatile 41; CHECK-NOT: #{{[0-9]+}} 42; CHECK-NEXT: call void @consume(i32 noundef %[[a1]]) 43 44declare void @consume(i32 noundef) #1 45 46; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none) 47declare ptr @llvm.preserve.static.offset(ptr readnone) #2 48 49attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 50attributes #1 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 51attributes #2 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) } 52 53!llvm.module.flags = !{!0} 54!llvm.ident = !{!1} 55 56!0 = !{i32 1, !"wchar_size", i32 4} 57!1 = !{!"clang"} 58!2 = !{!3, !4, i64 4} 59!3 = !{!"foo", !4, i64 0, !4, i64 4} 60!4 = !{!"int", !5, i64 0} 61!5 = !{!"omnipotent char", !6, i64 0} 62!6 = !{!"Simple C/C++ TBAA"} 63