Displaying 3 results from an estimated 3 matches for "branchweightmetadata".
2015 Oct 27
4
How can I tell llvm, that a branch is preferred ?
If I read the llvm language correctly, it doesn't have a way to specify
the preferred branch, correct ? I see nothing in the specs for "branch"
or "switch". And __buildin_expect does nothing, that I am sure of.
Unfortunately llvm has this knack for ordering my one most crucial part
of code exactly the opposite I want to, it does: (x86_64)
cmpq %r15, (%rax,%rdx)
jne
2011 Aug 31
2
[LLVMdev] Branch transformation with branch-weight metadata
Hello :)
I am looking around __builtin_expect() directive for optimization.
( http://llvm.org/docs/BranchWeightMetadata.html )
Since it is not included in v2.9, I am searching about it on svn trunk.
I found that the lowering phase generates branch-weight metadata node for
that directive.
However, I can't find any code related to the metadata even in the branch
transformation code.
IMHO, in case the branch direc...
2014 Dec 02
7
[LLVMdev] Memset/memcpy: user control of loop-idiom recognizer
Hi,
In feedback from game studios a common issue is the replacement of
loops with calls to memcpy/memset. These loops are often
hand-optimised, and highly-efficient and the developers strongly want
a way to control the compiler (i.e. leave my loop alone).
The culprit is of course the loop-idiom recognizer. This replaces any
loop that looks like a memset/memcpy with calls. This affects loops