forked from OSchip/llvm-project
39 lines
1.6 KiB
LLVM
39 lines
1.6 KiB
LLVM
; RUN: opt -passes=print-access-info %s -disable-output 2>&1 | FileCheck %s
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; This test defends against accidentally using alloc size instead of store size when performing run-time
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; boundary check of memory accesses. The IR in this file is based on
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; llvm/test/Analysis/LoopAccessAnalysis/memcheck-off-by-one-error.ll.
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; Here, we use i19 instead of i64 because it has a different alloc size to its store size.
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;CHECK: function 'fastCopy':
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;CHECK: (Low: %op High: (27 + %op))
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;CHECK: (Low: %src High: (27 + %src))
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define void @fastCopy(i8* nocapture readonly %src, i8* nocapture %op) {
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entry:
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br label %while.body.preheader
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while.body.preheader: ; preds = %entry
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br label %while.body
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while.body: ; preds = %while.body.preheader, %while.body
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%len.addr.07 = phi i32 [ %sub, %while.body ], [ 32, %while.body.preheader ]
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%op.addr.06 = phi i8* [ %add.ptr1, %while.body ], [ %op, %while.body.preheader ]
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%src.addr.05 = phi i8* [ %add.ptr, %while.body ], [ %src, %while.body.preheader ]
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%0 = bitcast i8* %src.addr.05 to i19*
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%1 = load i19, i19* %0, align 8
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%2 = bitcast i8* %op.addr.06 to i19*
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store i19 %1, i19* %2, align 8
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%add.ptr = getelementptr inbounds i8, i8* %src.addr.05, i19 8
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%add.ptr1 = getelementptr inbounds i8, i8* %op.addr.06, i19 8
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%sub = add nsw i32 %len.addr.07, -8
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%cmp = icmp sgt i32 %len.addr.07, 8
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br i1 %cmp, label %while.body, label %while.end.loopexit
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while.end.loopexit: ; preds = %while.body
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br label %while.end
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while.end: ; preds = %while.end.loopexit, %entry
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ret void
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}
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