From: David Malcolm <dmalcolm@redhat.com>
To: Dibyendu Majumdar <mobile@majumdar.org.uk>
Cc: jit@gcc.gnu.org
Subject: Re: Filed PR jit/66812 for the code generation issue
Date: Thu, 01 Jan 2015 00:00:00 -0000 [thread overview]
Message-ID: <1436382217.24803.101.camel@surprise> (raw)
In-Reply-To: <CACXZuxdi+M+Ttgszi9hqDvT1V-NrQKxD3dTM6TOO2m3dzaz34g@mail.gmail.com>
On Wed, 2015-07-08 at 20:01 +0100, Dibyendu Majumdar wrote:
> On 8 July 2015 at 18:46, David Malcolm <dmalcolm@redhat.com> wrote:
> > Dibyendu: what Lua code generated the reproducer? What is the code
> > meant to be doing?
> >
>
> Hi Dave - the Lua test is this:
>
> function x()
> local IX
> if ((10 or true) and false) then
> IX = true
> end;
> return ((10 or true) and false)
> end
> assert(x() == false)
>
> In the original test IX is an upvalue - i.e. a variable in outer
> scope. This is my standalone version of the test. The original test is
> generated as part of the Lua test suite - its purpose is to test
> various permutations of boolean operators.
>
> The original test compares IX and the function return.
>
> The issue is that this test should return false - if you see the
> return statement. However when -O2 or -O3 is enabled it returns true.
>
> The if statement is indeed redundant in this cut down version as IX is
> a local variable. But the return statement is not redundant.
Thanks. What does this look like as bytecodes?
next prev parent reply other threads:[~2015-07-08 19:11 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-01 0:00 A possible " Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Filed PR jit/66811: jit jumps aren't compilable as C (Re: A possible code generation issue) David Malcolm
2015-01-01 0:00 ` Filed PR jit/66811: jit dumps " David Malcolm
2015-01-01 0:00 ` A possible code generation issue Dibyendu Majumdar
2015-01-01 0:00 ` PR jit/66783 (Re: A possible code generation issue) David Malcolm
2015-01-01 0:00 ` [PATCH, committed] PR jit/66783: prevent use of opaque structs David Malcolm
2015-01-01 0:00 ` Filed PR jit/66812 for the code generation issue David Malcolm
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` David Malcolm [this message]
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` [PATCH] PR jit/66812: Candidate fix for for the code generation issue, v1 David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Filed PR jit/66812 for the code generation issue Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` David Malcolm
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
2015-01-01 0:00 ` Dibyendu Majumdar
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