[llvm-dev] llvm.localsescape/recover

[Reid Kleckner via llvm-dev]

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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