62 lines
1.9 KiB
LLVM
62 lines
1.9 KiB
LLVM
; RUN: opt --bpf-check-and-opt-ir -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s
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;
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; Check unroll of getelementptr.and.store when direct memory offset is
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; used instead of field indexes.
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;
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; Source:
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; #define __ctx __attribute__((preserve_static_offset))
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;
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; struct foo {
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; char aa;
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; char bb;
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; };
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;
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; struct bar {
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; char a;
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; struct foo b;
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; } __ctx;
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;
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; void buz(struct bar *p) {
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; ((struct foo *)(((char*)&p->b) + 1))->bb = 42;
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; }
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;
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; Compilation flag:
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; clang -cc1 -O2 -triple bpf -S -emit-llvm -disable-llvm-passes -o - \
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; | opt -passes=sroa,bpf-preserve-static-offset -S -o -
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; Function Attrs: nounwind
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define dso_local void @buz(ptr noundef %p) #0 {
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entry:
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call void (i8, ptr, i1, i8, i8, i8, i1, ...)
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@llvm.bpf.getelementptr.and.store.i8
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(i8 42,
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ptr writeonly elementtype(i8) %p,
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i1 false, i8 0, i8 1, i8 0, i1 true, i64 immarg 3)
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#3, !tbaa !2
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ret void
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}
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; CHECK: define dso_local void @buz(ptr noundef %[[p:.*]])
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; CHECK: %[[v2:.*]] = getelementptr inbounds i8, ptr %[[p]], i64 3
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; CHECK: store i8 42, ptr %[[v2]], align 1
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; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
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declare ptr @llvm.preserve.static.offset(ptr readnone) #1
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; Function Attrs: nocallback nofree nounwind willreturn
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declare void @llvm.bpf.getelementptr.and.store.i8(i8, ptr nocapture, i1 immarg, i8 immarg, i8 immarg, i8 immarg, i1 immarg, ...) #2
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attributes #0 = { nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
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attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
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attributes #2 = { nocallback nofree nounwind willreturn }
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attributes #3 = { memory(argmem: write) }
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!llvm.module.flags = !{!0}
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!llvm.ident = !{!1}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = !{!"clang"}
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!2 = !{!3, !4, i64 1}
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!3 = !{!"foo", !4, i64 0, !4, i64 1}
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!4 = !{!"omnipotent char", !5, i64 0}
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!5 = !{!"Simple C/C++ TBAA"}
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