[llvm-dev] llvm.localsescape/recover

[Carlo Kok via llvm-dev]

That's quite likely.  I can reproduce this issue with llvm 6.0 though. I'll try with svn HEAD.

On Tue, Apr 3, 2018, at 19:22, Reid Kleckner wrote:
> I would guess that %threedoubles has a large alignment and that is making things go wrong. I thought we fixed this bug, though. I can't find it in the tracker, but it's in there. Someone used __try with local variables of type 'double' on 32-bit and things didn't work out. I'm pretty sure we fixed it though.
> 
> On Tue, Apr 3, 2018 at 4:53 AM Carlo Kok via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>> I 'm using locals recover to have a seh finally in a separate function:
>>  
>>    %1 = alloca i8*, align 4
>>    store i8* %0, i8** %1
>>    %2 = alloca i32
>>    store i32 0, i32* %2
>>  call void (...) @llvm.localescape(i8** %1, i32* %2)
>>  
>>  call my finaly like:
>>  
>>    %loctmp = call i8* @llvm.localaddress()
>>  call void @"TEST$Fin0"(i8 0, i8* %loctmp)
>>  
>>  and recover it with:
>>  
>>   %2 = call i8* @llvm.localrecover(i8* bitcast (void (i8*)* @TEST to i8*), i8* %1, i32 0)
>>    %3 = bitcast i8* %2 to i8**
>>  %4 = load i8*, i8** %3
>>  
>>  I get the right value passed to my original function (ie %1)
>>  
>>  If I however *just* add a struct with 3 doubles alloca in it and localsescape those too:
>>  
>>    %3 = alloca %threedoubles
>>   store %threedoubles zeroinitializer, %threedoubles* %3
>>   call void (...) @llvm.localescape(i8** %1, i32* %2, %threedoubles* %3)
>>  
>>  I get a different value (full testcase here)
>>  
>>  https://gist.github.com/carlokok/e1c9aef9c8a382afdb280385a422f913
>>  
>>  What am I doing wrong here?
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