[llvm-dev] segv inside loop on x86_64

[David Majnemer via llvm-dev]

On Tue, Oct 27, 2015 at 9:14 AM, David Majnemer <david.majnemer at gmail.com>
wrote:

>
>
> On Mon, Oct 26, 2015 at 10:13 PM, Matt Arsenault via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>>
>> On Oct 27, 2015, at 12:46 AM, Peter McKinna via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>> label_1:                                          ; preds = %label_2,
>> %entry
>>   %v.87 = load i64, i64* %i, align 8
>>   %abs_icmp = icmp slt i64 %v.87, 0
>>   %itetmp = alloca i64
>>   br i1 %abs_icmp, label %abs_then, label %abs_else
>>
>>
>> You are supposed to have all allocas in the entry block, although I’m not
>> sure if this is not expected to work.
>>
>
> You can have allocas outside the entry block *but* they are not statically
> allocated, they are dynamically allocated.
>
> What this loop is running out of stack because it is allocating 8 bytes on
> each iteration and executing ~500000 iterations.
>

Apologies for the noise, I didn't see the follow on mails... My mail client
must be misconfigured....


>
>
>>
>>
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