derek.holloway
7502bf64a4
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54 lines
1.6 KiB
LLVM
54 lines
1.6 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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target triple = "x86_64-apple-macosx10.4.0"
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; __stack_chk_guard must be loaded for twice, once for setting up the canary,
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; another time for performing the check. It is because if we reuse the same
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; stack guard value, it may get spilled to the stack, then the for loop may
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; corrupt it.
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;
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; bool Bar(int*);
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; bool Foo(int n) {
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; int a[10];
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; for (int i = 0; i < n; i++) {
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; a[i] = 0;
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; }
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; return Bar(a);
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; }
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;
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; CHECK: movq ___stack_chk_guard
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; CHECK: movq ___stack_chk_guard
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define zeroext i1 @_Z3Fooi(i32 %n) sspstrong {
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entry:
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%n.addr = alloca i32, align 4
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%a = alloca [10 x i32], align 16
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%i = alloca i32, align 4
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store i32 %n, ptr %n.addr, align 4
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store i32 0, ptr %i, align 4
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br label %for.cond
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for.cond: ; preds = %for.inc, %entry
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%tmp = load i32, ptr %i, align 4
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%tmp1 = load i32, ptr %n.addr, align 4
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%cmp = icmp slt i32 %tmp, %tmp1
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br i1 %cmp, label %for.body, label %for.end
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for.body: ; preds = %for.cond
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%tmp2 = load i32, ptr %i, align 4
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%idxprom = sext i32 %tmp2 to i64
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%arrayidx = getelementptr inbounds [10 x i32], ptr %a, i64 0, i64 %idxprom
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store i32 0, ptr %arrayidx, align 4
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br label %for.inc
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for.inc: ; preds = %for.body
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%tmp3 = load i32, ptr %i, align 4
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%inc = add nsw i32 %tmp3, 1
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store i32 %inc, ptr %i, align 4
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br label %for.cond
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for.end: ; preds = %for.cond
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%call = call zeroext i1 @_Z3BarPi(ptr %a)
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ret i1 %call
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}
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declare zeroext i1 @_Z3BarPi(ptr)
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