57 lines · plain
1; RUN: opt -O2 -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s2;3; Check handling of a volatile store instruction by bpf-preserve-static-offset.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; void bar(struct foo *p) {14; p->b = 42;15; }16;17; Compilation flag:18; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \19; | opt -passes=function(sroa) -S -o -20 21%struct.foo = type { i32, i32 }22 23; Function Attrs: nounwind24define dso_local void @bar(ptr noundef %p) #0 {25entry:26 %0 = call ptr @llvm.preserve.static.offset(ptr %p)27 %b = getelementptr inbounds %struct.foo, ptr %0, i32 0, i32 128 store volatile i32 42, ptr %b, align 4, !tbaa !229 ret void30}31 32; CHECK: define dso_local void @bar(ptr noundef captures(none) %[[p:.*]])33; CHECK: tail call void (i32, ptr, i1, i8, i8, i8, i1, ...)34; CHECK-SAME: @llvm.bpf.getelementptr.and.store.i3235; CHECK-SAME: (i32 42,36; CHECK-SAME: ptr elementtype(%struct.foo) %[[p]],37; CHECK-SAME: i1 true, i8 0, i8 1, i8 2, i1 true, i32 immarg 0, i32 immarg 1),38; CHECK-NOT: #{{[0-9]+}}39; CHECK-SAME: !tbaa40 41; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)42declare ptr @llvm.preserve.static.offset(ptr readnone) #143 44attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" }45attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }46 47!llvm.module.flags = !{!0}48!llvm.ident = !{!1}49 50!0 = !{i32 1, !"wchar_size", i32 4}51!1 = !{!"clang"}52!2 = !{!3, !4, i64 4}53!3 = !{!"foo", !4, i64 0, !4, i64 4}54!4 = !{!"int", !5, i64 0}55!5 = !{!"omnipotent char", !6, i64 0}56!6 = !{!"Simple C/C++ TBAA"}57