Behalf Of Song, Ruiling
Sent: Wednesday, December 18, 2013 10:06 AM
To: Gong, Zhigang; beignet@lists.freedesktop.org
Cc: Gong, Zhigang
Subject: Re: [Beignet] [PATCH 2/2] GBE: fix a corner case which refer to a
undefined value.
Really strange corner case, I thought that normally the basic blocks
:26 PM
To: beignet@lists.freedesktop.org
Cc: Gong, Zhigang
Subject: [Beignet] [PATCH 2/2] GBE: fix a corner case which refer to a
undefined value.
Clang/llvm may generate some code similar to the following IRs:
... (there is no definition of %7)
br label 2
label1:
%10 = add %7, %6
...
ret
Clang/llvm may generate some code similar to the following IRs:
... (there is no definition of %7)
br label 2
label1:
%10 = add %7, %6
...
ret
label2:
%7 = ...
br label1
The value %7 is assigned after label2 but is referred at label1.
>From the control flow, the IRs is valid. As th
