66 lines
2.2 KiB
LLVM
66 lines
2.2 KiB
LLVM
; RUN: opt -passes=bpf-preserve-static-offset -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s
|
|
;
|
|
; Check handling of a load instruction for a field with non-standard
|
|
; alignment by bpf-preserve-static-offset.
|
|
;
|
|
; Source:
|
|
; #define __ctx __attribute__((preserve_static_offset))
|
|
;
|
|
; typedef int aligned_int __attribute__((aligned(128)));
|
|
;
|
|
; struct foo {
|
|
; int _;
|
|
; aligned_int a;
|
|
; } __ctx;
|
|
;
|
|
; extern void consume(int);
|
|
;
|
|
; void bar(struct foo *p) {
|
|
; consume(p->a);
|
|
; }
|
|
;
|
|
; Compilation flag:
|
|
; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \
|
|
; | opt -passes=function(sroa) -S -o -
|
|
|
|
%struct.foo = type { i32, [124 x i8], i32, [124 x i8] }
|
|
|
|
; Function Attrs: nounwind
|
|
define dso_local void @bar(ptr noundef %p) #0 {
|
|
entry:
|
|
%0 = call ptr @llvm.preserve.static.offset(ptr %p)
|
|
%a = getelementptr inbounds %struct.foo, ptr %0, i32 0, i32 2
|
|
%1 = load i32, ptr %a, align 128, !tbaa !2
|
|
call void @consume(i32 noundef %1)
|
|
ret void
|
|
}
|
|
|
|
; CHECK: %[[a1:.*]] = call i32 (ptr, i1, i8, i8, i8, i1, ...)
|
|
; CHECK-SAME: @llvm.bpf.getelementptr.and.load.i32
|
|
; CHECK-SAME: (ptr readonly elementtype(%struct.foo) %{{[^,]+}},
|
|
; CHECK-SAME: i1 false, i8 0, i8 1, i8 7, i1 true, i32 immarg 0, i32 immarg 2)
|
|
; ^^^^
|
|
; alignment 2**7
|
|
; CHECK-SAME: #[[v2:.*]], !tbaa
|
|
; CHECK-NEXT: call void @consume(i32 noundef %[[a1]])
|
|
; CHECK: attributes #[[v2]] = { memory(argmem: read) }
|
|
|
|
declare void @consume(i32 noundef) #1
|
|
|
|
; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
|
|
declare ptr @llvm.preserve.static.offset(ptr readnone) #2
|
|
|
|
attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
|
|
attributes #1 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
|
|
attributes #2 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
|
|
|
|
!llvm.module.flags = !{!0}
|
|
!llvm.ident = !{!1}
|
|
|
|
!0 = !{i32 1, !"wchar_size", i32 4}
|
|
!1 = !{!"clang"}
|
|
!2 = !{!3, !4, i64 128}
|
|
!3 = !{!"foo", !4, i64 0, !4, i64 128}
|
|
!4 = !{!"int", !5, i64 0}
|
|
!5 = !{!"omnipotent char", !6, i64 0}
|
|
!6 = !{!"Simple C/C++ TBAA"}
|