1; RUN: opt --bpf-check-and-opt-ir -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s 2; 3; Check that unroll of getelementptr.and.store restores volatile. 4; 5; Source: 6; #define __ctx __attribute__((preserve_static_offset)) 7; 8; struct foo { 9; int a; 10; volatile int b; 11; } __ctx; 12; 13; extern void consume(int); 14; 15; void bar(struct foo *p){ 16; p->b = 42; 17; } 18; 19; Compilation flag: 20; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \ 21; | opt -passes=sroa,bpf-preserve-static-offset -S -o - 22 23%struct.foo = type { i32, i32 } 24 25; Function Attrs: nounwind 26define dso_local void @bar(ptr noundef %p) #0 { 27entry: 28 call void (i32, ptr, i1, i8, i8, i8, i1, ...) 29 @llvm.bpf.getelementptr.and.store.i32 30 (i32 42, 31 ptr elementtype(%struct.foo) %p, 32 i1 true, i8 0, i8 1, i8 2, i1 true, i32 immarg 0, i32 immarg 1), 33 !tbaa !2 34 ret void 35} 36 37; CHECK: define dso_local void @bar(ptr noundef %[[p:.*]]) 38; CHECK: entry: 39; CHECK: %[[v2:.*]] = getelementptr inbounds %struct.foo, ptr %[[p]], i32 0, i32 1 40; CHECK: store volatile i32 42, ptr %[[v2]], align 4 41 42; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none) 43declare ptr @llvm.preserve.static.offset(ptr readnone) #1 44 45; Function Attrs: nocallback nofree nounwind willreturn 46declare void @llvm.bpf.getelementptr.and.store.i32(i32, ptr nocapture, i1 immarg, i8 immarg, i8 immarg, i8 immarg, i1 immarg, ...) #2 47 48attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 49attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) } 50attributes #2 = { nocallback nofree nounwind willreturn } 51 52!llvm.module.flags = !{!0} 53!llvm.ident = !{!1} 54 55!0 = !{i32 1, !"wchar_size", i32 4} 56!1 = !{!"clang"} 57!2 = !{!3, !4, i64 4} 58!3 = !{!"foo", !4, i64 0, !4, i64 4} 59!4 = !{!"int", !5, i64 0} 60!5 = !{!"omnipotent char", !6, i64 0} 61!6 = !{!"Simple C/C++ TBAA"} 62