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1; RUN: llc < %s | FileCheck %s2target triple = "x86_64-apple-macosx10.4.0"3 4; __stack_chk_guard must be loaded for twice, once for setting up the canary,5; another time for performing the check. It is because if we reuse the same6; stack guard value, it may get spilled to the stack, then the for loop may7; corrupt it.8;9; bool Bar(int*);10; bool Foo(int n) {11; int a[10];12; for (int i = 0; i < n; i++) {13; a[i] = 0;14; }15; return Bar(a);16; }17;18; CHECK: movq ___stack_chk_guard19; CHECK: movq ___stack_chk_guard20define zeroext i1 @_Z3Fooi(i32 %n) sspstrong {21entry:22 %n.addr = alloca i32, align 423 %a = alloca [10 x i32], align 1624 %i = alloca i32, align 425 store i32 %n, ptr %n.addr, align 426 store i32 0, ptr %i, align 427 br label %for.cond28 29for.cond: ; preds = %for.inc, %entry30 %tmp = load i32, ptr %i, align 431 %tmp1 = load i32, ptr %n.addr, align 432 %cmp = icmp slt i32 %tmp, %tmp133 br i1 %cmp, label %for.body, label %for.end34 35for.body: ; preds = %for.cond36 %tmp2 = load i32, ptr %i, align 437 %idxprom = sext i32 %tmp2 to i6438 %arrayidx = getelementptr inbounds [10 x i32], ptr %a, i64 0, i64 %idxprom39 store i32 0, ptr %arrayidx, align 440 br label %for.inc41 42for.inc: ; preds = %for.body43 %tmp3 = load i32, ptr %i, align 444 %inc = add nsw i32 %tmp3, 145 store i32 %inc, ptr %i, align 446 br label %for.cond47 48for.end: ; preds = %for.cond49 %call = call zeroext i1 @_Z3BarPi(ptr %a)50 ret i1 %call51}52 53declare zeroext i1 @_Z3BarPi(ptr)54