derek.holloway
7502bf64a4
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52 lines
1.5 KiB
LLVM
52 lines
1.5 KiB
LLVM
; RUN: opt -O2 -mtriple=bpf-pc-linux -S -o - %s | FileCheck %s
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;
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; Check that stores from zero offset are not modified by bpf-preserve-static-offset.
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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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; int a;
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; } __ctx;
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;
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; void bar(struct foo *p) {
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; p->a = 0;
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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=function(sroa) -S -o -
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%struct.foo = type { i32 }
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; Function Attrs: nounwind
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define dso_local void @bar(ptr noundef %p) #0 {
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entry:
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%0 = call ptr @llvm.preserve.static.offset(ptr %p)
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%a = getelementptr inbounds %struct.foo, ptr %0, i32 0, i32 0
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store i32 0, ptr %a, align 4, !tbaa !2
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ret void
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}
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; CHECK: define dso_local void @bar(ptr noundef writeonly captures(none) initializes((0, 4)) %[[p:.*]])
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; CHECK-NEXT: entry:
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; CHECK-NEXT: store i32 0, ptr %[[p]], align 4, !tbaa
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; CHECK-NEXT: ret void
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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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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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!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 0}
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!3 = !{!"foo", !4, i64 0}
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!4 = !{!"int", !5, i64 0}
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!5 = !{!"omnipotent char", !6, i64 0}
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!6 = !{!"Simple C/C++ TBAA"}
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