diff options
Diffstat (limited to 'llvm/docs/LangRef.rst')
| -rw-r--r-- | llvm/docs/LangRef.rst | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst index 0e4eae0df80..5273bf0ac11 100644 --- a/llvm/docs/LangRef.rst +++ b/llvm/docs/LangRef.rst @@ -10417,6 +10417,34 @@ Bit Manipulation Intrinsics LLVM provides intrinsics for a few important bit manipulation operations. These allow efficient code generation for some algorithms. +'``llvm.bitreverse.*``' Intrinsics +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Syntax: +""""""" + +This is an overloaded intrinsic function. You can use bitreverse on any +integer type. + +:: + + declare i16 @llvm.bitreverse.i16(i16 <id>) + declare i32 @llvm.bitreverse.i32(i32 <id>) + declare i64 @llvm.bitreverse.i64(i64 <id>) + +Overview: +""""""""" + +The '``llvm.bitreverse``' family of intrinsics is used to reverse the +bitpattern of an integer value; for example ``0b1234567`` becomes +``0b7654321``. + +Semantics: +"""""""""" + +The ``llvm.bitreverse.iN`` intrinsic returns an i16 value that has bit +``M`` in the input moved to bit ``N-M`` in the output. + '``llvm.bswap.*``' Intrinsics ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
