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1; RUN: opt -O2 -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s2;3; Check position of bpf-preserve-static-offset pass in the pipeline:4; - preserve.static.offset call is preserved if address is passed as5; a parameter to an inline-able function;6; - second bpf-preserve-static-offset pass (after inlining) should introduce7; 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: nounwind40define 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 144 call void @bar(ptr noundef %b)45 ret void46}47 48; Function Attrs: inlinehint nounwind49define internal void @bar(ptr noundef %p) #1 {50entry:51 %bb = getelementptr inbounds %struct.bar, ptr %p, i32 0, i32 152 %0 = load i32, ptr %bb, align 4, !tbaa !253 call void @consume(i32 noundef %0)54 ret void55}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.i3260; 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:.*]], !tbaa63; 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) #268 69declare void @consume(i32 noundef) #370 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