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1; RUN: opt -O2 -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s2;3; Check that stores from zero offset are not modified by bpf-preserve-static-offset.4;5; Source:6; #define __ctx __attribute__((preserve_static_offset))7; 8; struct foo {9; int a;10; } __ctx;11; 12; void bar(struct foo *p) {13; p->a = 0;14; }15;16; Compilation flag:17; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \18; | opt -passes=function(sroa) -S -o -19 20%struct.foo = type { i32 }21 22; Function Attrs: nounwind23define dso_local void @bar(ptr noundef %p) #0 {24entry:25 %0 = call ptr @llvm.preserve.static.offset(ptr %p)26 %a = getelementptr inbounds %struct.foo, ptr %0, i32 0, i32 027 store i32 0, ptr %a, align 4, !tbaa !228 ret void29}30 31; CHECK: define dso_local void @bar(ptr noundef writeonly captures(none) initializes((0, 4)) %[[p:.*]])32; CHECK-NEXT: entry:33; CHECK-NEXT: store i32 0, ptr %[[p]], align 4, !tbaa34; CHECK-NEXT: ret void35 36; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)37declare ptr @llvm.preserve.static.offset(ptr readnone) #138 39attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" }40attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }41 42!llvm.module.flags = !{!0}43!llvm.ident = !{!1}44 45!0 = !{i32 1, !"wchar_size", i32 4}46!1 = !{!"clang"}47!2 = !{!3, !4, i64 0}48!3 = !{!"foo", !4, i64 0}49!4 = !{!"int", !5, i64 0}50!5 = !{!"omnipotent char", !6, i64 0}51!6 = !{!"Simple C/C++ TBAA"}52