conversion code do we really need?
- S.append_uint(N) can be replaced with 'raw_svector_ostream(S) << N' which is
somewhat slower due to the extra set up cost, but still plenty fast
(especially if the svector set up cost can be amortized).
llvm-svn: 79450
- These allow clients to make use of the extra elements in the vector which
have already been allocated, without requiring them to be value initialized.
llvm-svn: 79433
the darwin version string. This should help consolidate
the variety of weird functions we have scattered around the
codebase that do stuff like this.
llvm-svn: 78792
This is not just a matter of passing in the target triple from the module;
currently backends are making decisions based on the build and host
architecture. The goal is to migrate to making these decisions based off of the
triple (in conjunction with the feature string). Thus most clients pass in the
target triple, or the host triple if that is empty.
This has one important change in the way behavior of the JIT and llc.
For the JIT, it was previously selecting the Target based on the host
(naturally), but it was setting the target machine features based on the triple
from the module. Now it is setting the target machine features based on the
triple of the host.
For LLC, -march was previously only used to select the target, the target
machine features were initialized from the module's triple (which may have been
empty). Now the target triple is taken from the module, or the host's triple is
used if that is empty. Then the triple is adjusted to match -march.
The take away is that -march for llc is now used in conjunction with the host
triple to initialize the subtarget. If users want more deterministic behavior
from llc, they should use -mtriple, or set the triple in the input module.
llvm-svn: 77946
- Provides static constructors for doing number to string conversions without
using temporaries.
- There are several ways to do this, I think given the Twine constraints this
is the simplest one.
- One FIXME for fast number -> hex conversion.
- Added another comment on one last major bit of perf work Twines need, which
is to make raw_svector_ostream more efficient.
llvm-svn: 77445
but this ends up compiling code like this:
int foo(const StringRef &R) {
return R == "food";
}
to use a constant sized memcmp instead of a variable memcmp.
llvm-svn: 77160
- Yay for '-'s and simplifications!
- I kept StringMap::GetOrCreateValue for compatibility purposes, this can
eventually go away. Likewise the StringMapEntry Create functions still follow
the old style.
- NIFC.
llvm-svn: 76888
