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1; RUN: opt -passes=bpf-preserve-static-offset -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s2;3; Check handling of atomic load instruction by bpf-preserve-static-offset.4;5; Source:6; #define __ctx __attribute__((preserve_static_offset))7; 8; struct foo {9; int _;10; int a;11; } __ctx;12; 13; extern void consume(int);14; 15; void bar(struct foo *p) {16; int r;17; __atomic_load(&p->a, &r, 2);18; consume(r);19; }20;21; Compilation flag:22; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \23; | opt -passes=function(sroa) -S -o -24 25%struct.foo = type { i32, i32 }26 27; Function Attrs: nounwind28define dso_local void @bar(ptr noundef %p) #0 {29entry:30 %0 = call ptr @llvm.preserve.static.offset(ptr %p)31 %a = getelementptr inbounds %struct.foo, ptr %0, i32 0, i32 132 %1 = load atomic i32, ptr %a acquire, align 433 call void @consume(i32 noundef %1)34 ret void35}36 37; CHECK: %[[a1:.*]] = call i32 (ptr, i1, i8, i8, i8, i1, ...)38; CHECK-SAME: @llvm.bpf.getelementptr.and.load.i3239; CHECK-SAME: (ptr elementtype(%struct.foo) %[[p:.*]],40; i1 false, i8 4, i8 1, i8 2, i1 true, i32 immarg 0, i32 immarg 1)41; ^^^^42; atomic order43; CHECK-NOT: #{{[0-9]+}}44; CHECK-NEXT: call void @consume(i32 noundef %[[a1]])45 46; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)47declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #148 49; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)50declare ptr @llvm.preserve.static.offset(ptr readnone) #251 52declare void @consume(i32 noundef) #353 54; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)55declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #156 57attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" }58attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }59attributes #2 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }60attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" }61 62!llvm.module.flags = !{!0}63!llvm.ident = !{!1}64 65!0 = !{i32 1, !"wchar_size", i32 4}66!1 = !{!"clang"}67