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1; RUN: opt --bpf-check-and-opt-ir -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s2;3; Check unroll of getelementptr.and.load when direct memory offset is4; used instead of field indexes.5;6; Source:7; #define __ctx __attribute__((preserve_static_offset))8; 9; struct foo {10; char aa;11; char bb;12; };13; 14; struct bar {15; char a;16; struct foo b;17; } __ctx;18; 19; extern void consume(char);20; 21; void buz(struct bar *p) {22; consume(((struct foo *)(((char*)&p->b) + 1))->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; Function Attrs: nounwind30define dso_local void @buz(ptr noundef %p) #0 {31entry:32 %bb1 = call i8 (ptr, i1, i8, i8, i8, i1, ...)33 @llvm.bpf.getelementptr.and.load.i834 (ptr readonly elementtype(i8) %p,35 i1 false, i8 0, i8 1, i8 0, i1 true, i64 immarg 3)36 #4, !tbaa !237 call void @consume(i8 noundef signext %bb1)38 ret void39}40 41; CHECK: define dso_local void @buz(ptr noundef %[[p:.*]])42; CHECK: %[[bb11:.*]] = getelementptr inbounds i8, ptr %[[p]], i64 343; CHECK: %[[v2:.*]] = load i8, ptr %[[bb11]], align 144; CHECK: call void @consume(i8 noundef signext %[[v2]])45 46declare void @consume(i8 noundef signext) #147 48; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)49declare ptr @llvm.preserve.static.offset(ptr readnone) #250 51; Function Attrs: nocallback nofree nounwind willreturn52declare i8 @llvm.bpf.getelementptr.and.load.i8(ptr nocapture, i1 immarg, i8 immarg, i8 immarg, i8 immarg, i1 immarg, ...) #353 54attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" }55attributes #1 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" }56attributes #2 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }57attributes #3 = { nocallback nofree nounwind willreturn }58attributes #4 = { memory(argmem: read) }59 60!llvm.module.flags = !{!0}61!llvm.ident = !{!1}62 63!0 = !{i32 1, !"wchar_size", i32 4}64!1 = !{!"clang"}65!2 = !{!3, !4, i64 1}66!3 = !{!"foo", !4, i64 0, !4, i64 1}67!4 = !{!"omnipotent char", !5, i64 0}68!5 = !{!"Simple C/C++ TBAA"}69