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Clarify the difference between ISD::BITCAST and the bitcast instruction from LLVM-IR. 

Subscribers: llvm-commits, hfinkel

Differential Revision: http://reviews.llvm.org/D16464

llvm-svn: 269031
This commit is contained in:
Daniel Sanders 2016-05-10 09:01:54 +00:00
parent 5471829351
commit 5cdb9d9ddb
1 changed files with 6 additions and 0 deletions
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6
llvm/include/llvm/CodeGen/ISDOpcodes.h
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@ -486,6 +486,12 @@ namespace ISD {
/// the same bit size (e.g. f32 <-> i32). This can also be used for
/// int-to-int or fp-to-fp conversions, but that is a noop, deleted by
/// getNode().
///
/// This operator is subtly different from the bitcast instruction from
/// LLVM-IR since this node may change the bits in the register. For
/// example, this occurs on big-endian NEON and big-endian MSA where the
/// layout of the bits in the register depends on the vector type and this
/// operator acts as a shuffle operation for some vector type combinations.
BITCAST,
/// ADDRSPACECAST - This operator converts between pointers of different