1; RUN: opt -O2 -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s 2; 3; Check position of bpf-preserve-static-offset pass in the pipeline: 4; - preserve.static.offset call is preserved if address is passed as 5; a parameter to an inline-able function; 6; - second bpf-preserve-static-offset pass (after inlining) should introduce 7; getelementptr.and.load call using the preserved marker. 8; 9; Source: 10; #define __ctx __attribute__((preserve_static_offset)) 11; 12; struct bar { 13; int aa; 14; int bb; 15; }; 16; 17; struct foo { 18; int a; 19; struct bar b; 20; } __ctx; 21; 22; extern void consume(int); 23; 24; static inline void bar(struct bar *p){ 25; consume(p->bb); 26; } 27; 28; void quux(struct foo *p) { 29; bar(&p->b); 30; } 31; 32; Compilation flag: 33; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \ 34; | opt -passes=function(sroa) -S -o - 35 36%struct.foo = type { i32, %struct.bar } 37%struct.bar = type { i32, i32 } 38 39; Function Attrs: nounwind 40define dso_local void @quux(ptr noundef %p) #0 { 41entry: 42 %0 = call ptr @llvm.preserve.static.offset(ptr %p) 43 %b = getelementptr inbounds %struct.foo, ptr %0, i32 0, i32 1 44 call void @bar(ptr noundef %b) 45 ret void 46} 47 48; Function Attrs: inlinehint nounwind 49define internal void @bar(ptr noundef %p) #1 { 50entry: 51 %bb = getelementptr inbounds %struct.bar, ptr %p, i32 0, i32 1 52 %0 = load i32, ptr %bb, align 4, !tbaa !2 53 call void @consume(i32 noundef %0) 54 ret void 55} 56 57; CHECK: define dso_local void @quux(ptr noundef readonly captures(none) %[[p:.*]]) 58; CHECK: %[[bb_i1:.*]] = tail call i32 (ptr, i1, i8, i8, i8, i1, ...) 59; CHECK-SAME: @llvm.bpf.getelementptr.and.load.i32 60; CHECK-SAME: (ptr readonly elementtype(i8) %[[p]], 61; CHECK-SAME: i1 false, i8 0, i8 1, i8 2, i1 true, i64 immarg 8) 62; CHECK-SAME: #[[v2:.*]], !tbaa 63; CHECK-NEXT: tail call void @consume(i32 noundef %[[bb_i1]]) 64; CHECK: attributes #[[v2]] = { memory(argmem: read) } 65 66; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none) 67declare ptr @llvm.preserve.static.offset(ptr readnone) #2 68 69declare void @consume(i32 noundef) #3 70 71attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 72attributes #1 = { inlinehint nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 73attributes #2 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) } 74attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 75 76!llvm.module.flags = !{!0} 77!llvm.ident = !{!1} 78 79!0 = !{i32 1, !"wchar_size", i32 4} 80!1 = !{!"clang"} 81!2 = !{!3, !4, i64 4} 82!3 = !{!"bar", !4, i64 0, !4, i64 4} 83!4 = !{!"int", !5, i64 0} 84!5 = !{!"omnipotent char", !6, i64 0} 85!6 = !{!"Simple C/C++ TBAA"} 86