1; RUN: opt --bpf-check-and-opt-ir -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s 2; 3; Check unroll of getelementptr.and.load when several field indexes 4; are specified in a chain. 5; 6; Source: 7; #define __ctx __attribute__((preserve_static_offset)) 8; 9; struct bar { 10; int aa; 11; int bb; 12; }; 13; 14; struct foo { 15; int a; 16; struct bar b; 17; } __ctx; 18; 19; extern void consume(int); 20; 21; void buz(struct foo *p) { 22; consume(p->b.bb); 23; } 24; 25; Compilation flag: 26; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \ 27; | opt -passes=sroa,bpf-preserve-static-offset -S -o - 28 29%struct.foo = type { i32, %struct.bar } 30%struct.bar = type { i32, i32 } 31 32; Function Attrs: nounwind 33define dso_local void @buz(ptr noundef %p) #0 { 34entry: 35 %bb1 = call i32 (ptr, i1, i8, i8, i8, i1, ...) 36 @llvm.bpf.getelementptr.and.load.i32 37 (ptr readonly elementtype(%struct.foo) %p, 38 i1 false, i8 0, i8 1, i8 2, i1 true, i32 immarg 0, i32 immarg 1, i32 immarg 1) 39 #4, !tbaa !2 40 call void @consume(i32 noundef %bb1) 41 ret void 42} 43 44; CHECK: define dso_local void @buz(ptr noundef %[[p:.*]]) 45; CHECK: %[[bb11:.*]] = getelementptr inbounds %struct.foo, ptr %[[p]], i32 0, i32 1, i32 1 46; CHECK: %[[v2:.*]] = load i32, ptr %[[bb11]], align 4 47; CHECK: call void @consume(i32 noundef %[[v2]]) 48 49declare void @consume(i32 noundef) #1 50 51; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none) 52declare ptr @llvm.preserve.static.offset(ptr readnone) #2 53 54; Function Attrs: nocallback nofree nounwind willreturn 55declare i32 @llvm.bpf.getelementptr.and.load.i32(ptr nocapture, i1 immarg, i8 immarg, i8 immarg, i8 immarg, i1 immarg, ...) #3 56 57attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 58attributes #1 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" } 59attributes #2 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) } 60attributes #3 = { nocallback nofree nounwind willreturn } 61attributes #4 = { memory(argmem: read) } 62 63!llvm.module.flags = !{!0} 64!llvm.ident = !{!1} 65 66!0 = !{i32 1, !"wchar_size", i32 4} 67!1 = !{!"clang"} 68!2 = !{!3, !4, i64 8} 69!3 = !{!"foo", !4, i64 0, !7, i64 4} 70!4 = !{!"int", !5, i64 0} 71!5 = !{!"omnipotent char", !6, i64 0} 72!6 = !{!"Simple C/C++ TBAA"} 73!7 = !{!"bar", !4, i64 0, !4, i64 4} 74