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The Apple ld (shipped with Xcode, open-source) saves the 3 files if
-save-temps is applied:<br>
- xxx.lto.bc : the merged bit-code before IPA<br>
- xxx.lto.opt.bc: the optimized bit-code of the *.lto.bc<br>
- xxx.lto.o : the object file of xxx.lto.bc<br>
<br>
I think it is better way to go, often time we need IR both after and
after the transformation. <br>
<br>
<div class="moz-cite-prefix">On 6/4/13 3:37 AM, Jonas Wagner wrote:<br>
</div>
<blockquote
cite="mid:CAMRJFfJOups=ivsaKZpPOfHOBpbMQMP20pH5ULCXmx+c+1dZpg@mail.gmail.com"
type="cite">
<div dir="ltr">
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><span
style="color:rgb(80,0,80)">> I often use the gold
plugin's also-emit-llvm option to verify the final LLVM</span></blockquote>
<div class="gmail_extra">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="im">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
bitcode of a program. However, I realized that the
gold plugin generates the<br>
bitcode file before running LTO optimizations, such
that the changes performed<br>
by LTO are not reflected in the bitcode file.<br>
<br>
What is the reason for this behavior?<br>
</blockquote>
<br>
</div>
my guess: if the LTO optimizers crash, this is very
helpful for debugging<br>
because it gives you the input to the optimizers.<br>
</blockquote>
<div><br>
</div>
<div style="">This is true. It also means that if the LTO
optimizers don't crash, the bitcode is out of sync with
the program. And not crashing is more common than crashing
;)</div>
<div style=""><br>
</div>
<div style="">The question is whether also-emit-llvm is an
option intended for LTO debuggers or for LLVM end-users.
I'd argue that it is very useful for end-users, and that
LTO developers could get the bitcode through other means
if they are researching a crash. At least from my personal
point of view, I use also-emit-llvm frequently despite not
working on LTO. How do other people use this?</div>
<div style=""><br>
</div>
<div style="">Best,</div>
<div style="">Jonas</div>
</div>
</div>
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</blockquote>
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