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Currently, if you have BitCode that does not
specify a target, it gets a default architecture.
This is especially odd if you are doing
llvm-ld -native
but it first applies optimizations for
a target other than what it is currently compiling for.
Ideally, target-specific optimizations wouldn't be
applied until a target was given.
This would allow simple programs to be target-agnostic.
(And therefore more likely to work for newcomers.)
Why is there a default target?
Why can't those optimizations just be skipped until there is one?
(To be clear: I am assuming there is a reason for this.
I am asking what it is.)
Especially in the case of llvm-ld -native,
why doesn't it set the target to the platform
it is compiling for?
Failing that, it could use the platform it is
currently running on as the target.
- --
main(){char s[]="+~{Y$-:>2vp5z^",c=244,i;int j=44404;
for(;j>0;j--)for(i=0;i<14;i++)c+=s[i]-=c;puts(s);}
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Hi S3,> Currently, if you have BitCode that does not > specify a target, it gets a default architecture. > This is especially odd if you are doing > llvm-ld -native > but it first applies optimizations for > a target other than what it is currently compiling for.there has been some work on this, especially for "opt", but I don't know the status. Ciao, Duncan.
On Feb 21, 2010, at 4:10 PM, S3 wrote:> > Why is there a default target? > Why can't those optimizations just be skipped until there is one? > (To be clear: I am assuming there is a reason for this. > I am asking what it is.)This has recently been fixed on trunk. The opt tool no longer adds a default target if a Module has no target attributes, and the optimizers now know how to be conservative when there's no target information.> Especially in the case of llvm-ld -native, > why doesn't it set the target to the platform > it is compiling for?This sounds like it could be called a bug. Please file a bugzilla report. Dan
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1>> Why is there a default target? >> Why can't those optimizations just be skipped until there is one? >> (To be clear: I am assuming there is a reason for this. >> I am asking what it is.)> This has recently been fixed on trunk. The opt tool no longer adds a > default target if a Module has no target attributes, and the optimizers > now know how to be conservative when there's no target information.Great. That should make everything a lot easier.>> Especially in the case of llvm-ld -native, >> why doesn't it set the target to the platform >> it is compiling for?> This sounds like it could be called a bug. Please file a bugzilla report.Filed: http://llvm.org/bugs/show_bug.cgi?id=6401 - -- ++++++++++++[->+++++++>+++++++++<<]>-.>[->+>+>+>+>+ <<<<<]>++++++++.>-------.<--.>>.---.>++.>-----.>+++ +++++[->++++<]>.<<<<<<<<.>>++.>.>.>.>>++++++++++. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkuDhSIACgkQxzVgPqtIcfupCwCfRs9HlLHu4fXjr5tRRORIkI2R YcAAn2VYga4ykTbx2+9zlJwgv0+PgNPD =00oU -----END PGP SIGNATURE-----