1; RUN: opt -passes=bpf-preserve-static-offset -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s 2; 3; Check handling of a simple load instruction by bpf-preserve-static-offset. 4; Verify: 5; - presence of gep.and.load intrinsic call 6; - correct attributes for intrinsic call 7; - presence of tbaa annotations 8; 9; Source: 10; #define __ctx __attribute__((preserve_static_offset)) 11; 12; struct foo { 13; int _; 14; int a; 15; } __ctx; 16; 17; extern void consume(int); 18; 19; void bar(struct foo *p) { 20; consume(p->a); 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%struct.foo = type { i32, i32 } 28 29; Function Attrs: nounwind 30define dso_local void @bar(ptr noundef %p) #0 { 31entry: 32 %0 = call ptr @llvm.preserve.static.offset(ptr %p) 33 %a = getelementptr inbounds %struct.foo, ptr %0, i32 0, i32 1 34 %1 = load i32, ptr %a, align 4, !tbaa !2 35 call void @consume(i32 noundef %1) 36 ret void 37} 38 39; CHECK: define dso_local void @bar(ptr noundef %[[p:.*]]) 40; CHECK: %[[a1:.*]] = call i32 (ptr, i1, i8, i8, i8, i1, ...) 41; CHECK-SAME: @llvm.bpf.getelementptr.and.load.i32 42; CHECK-SAME: (ptr readonly elementtype(%struct.foo) %[[p]], 43; CHECK-SAME: i1 false, i8 0, i8 1, i8 2, i1 true, i32 immarg 0, i32 immarg 1) 44; CHECK-SAME: #[[v1:.*]], !tbaa 45; CHECK-NEXT: call void @consume(i32 noundef %[[a1]]) 46 47; CHECK: declare i32 48; CHECK-SAME: @llvm.bpf.getelementptr.and.load.i32(ptr captures(none), {{.*}}) #[[v2:.*]] 49 50; CHECK: attributes #[[v2]] = { nocallback nofree nounwind willreturn } 51; CHECK: attributes #[[v1]] = { memory(argmem: read) } 52 53declare void @consume(i32 noundef) #1 54 55; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none) 56declare ptr @llvm.preserve.static.offset(ptr readnone) #2 57 58attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 59attributes #1 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 60attributes #2 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) } 61 62!llvm.module.flags = !{!0} 63!llvm.ident = !{!1} 64 65!0 = !{i32 1, !"wchar_size", i32 4} 66!1 = !{!"clang"} 67!2 = !{!3, !4, i64 4} 68!3 = !{!"foo", !4, i64 0, !4, i64 4} 69!4 = !{!"int", !5, i64 0} 70!5 = !{!"omnipotent char", !6, i64 0} 71!6 = !{!"Simple C/C++ TBAA"} 72