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1; RUN: opt -passes=bpf-preserve-static-offset -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s2;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: nounwind26define 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 130 %1 = load volatile i32, ptr %a, align 4, !tbaa !231 call void @consume(i32 noundef %1)32 ret void33}34 35; CHECK: %[[a1:.*]] = call i32 (ptr, i1, i8, i8, i8, i1, ...)36; CHECK-SAME: @llvm.bpf.getelementptr.and.load.i3237; 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; volatile41; CHECK-NOT: #{{[0-9]+}}42; CHECK-NEXT: call void @consume(i32 noundef %[[a1]])43 44declare void @consume(i32 noundef) #145 46; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)47declare ptr @llvm.preserve.static.offset(ptr readnone) #248 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