1; RUN: opt -passes=bpf-preserve-static-offset -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s 2; 3; Check handling of atomic load instruction by bpf-preserve-static-offset. 4; 5; Source: 6; #define __ctx __attribute__((preserve_static_offset)) 7; 8; struct foo { 9; int _; 10; int a; 11; } __ctx; 12; 13; extern void consume(int); 14; 15; void bar(struct foo *p) { 16; int r; 17; __atomic_load(&p->a, &r, 2); 18; consume(r); 19; } 20; 21; Compilation flag: 22; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \ 23; | opt -passes=function(sroa) -S -o - 24 25%struct.foo = type { i32, i32 } 26 27; Function Attrs: nounwind 28define dso_local void @bar(ptr noundef %p) #0 { 29entry: 30 %0 = call ptr @llvm.preserve.static.offset(ptr %p) 31 %a = getelementptr inbounds %struct.foo, ptr %0, i32 0, i32 1 32 %1 = load atomic i32, ptr %a acquire, align 4 33 call void @consume(i32 noundef %1) 34 ret void 35} 36 37; CHECK: %[[a1:.*]] = call i32 (ptr, i1, i8, i8, i8, i1, ...) 38; CHECK-SAME: @llvm.bpf.getelementptr.and.load.i32 39; CHECK-SAME: (ptr elementtype(%struct.foo) %[[p:.*]], 40; i1 false, i8 4, i8 1, i8 2, i1 true, i32 immarg 0, i32 immarg 1) 41; ^^^^ 42; atomic order 43; CHECK-NOT: #{{[0-9]+}} 44; CHECK-NEXT: call void @consume(i32 noundef %[[a1]]) 45 46; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) 47declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1 48 49; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none) 50declare ptr @llvm.preserve.static.offset(ptr readnone) #2 51 52declare void @consume(i32 noundef) #3 53 54; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) 55declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1 56 57attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 58attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) } 59attributes #2 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) } 60attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 61 62!llvm.module.flags = !{!0} 63!llvm.ident = !{!1} 64 65!0 = !{i32 1, !"wchar_size", i32 4} 66!1 = !{!"clang"} 67