arsenm retitled this revision from "Add documentation for bitreverse builtins" to "Add missing __builtin_bitreverse8". arsenm updated the summary for this revision. arsenm updated this revision to Diff 49960.
http://reviews.llvm.org/D16993 Files: docs/LanguageExtensions.rst include/clang/Basic/Builtins.def test/CodeGen/builtins.c Index: test/CodeGen/builtins.c =================================================================== --- test/CodeGen/builtins.c +++ test/CodeGen/builtins.c @@ -117,9 +117,11 @@ P(bswap32, (N)); P(bswap64, (N)); + // CHECK: @llvm.bitreverse.i8 // CHECK: @llvm.bitreverse.i16 // CHECK: @llvm.bitreverse.i32 // CHECK: @llvm.bitreverse.i64 + P(bitreverse8, (N)); P(bitreverse16, (N)); P(bitreverse32, (N)); P(bitreverse64, (N)); Index: include/clang/Basic/Builtins.def =================================================================== --- include/clang/Basic/Builtins.def +++ include/clang/Basic/Builtins.def @@ -409,6 +409,7 @@ BUILTIN(__builtin_bswap32, "UiUi", "nc") BUILTIN(__builtin_bswap64, "ULLiULLi", "nc") +BUILTIN(__builtin_bitreverse8, "UcUc", "nc") BUILTIN(__builtin_bitreverse16, "UsUs", "nc") BUILTIN(__builtin_bitreverse32, "UiUi", "nc") BUILTIN(__builtin_bitreverse64, "ULLiULLi", "nc") Index: docs/LanguageExtensions.rst =================================================================== --- docs/LanguageExtensions.rst +++ docs/LanguageExtensions.rst @@ -1505,6 +1505,33 @@ Query for this feature with ``__has_builtin(__builtin_convertvector)``. +``__builtin_bitreverse`` +--------------------- + +* ``__builtin_bitreverse8`` +* ``__builtin_bitreverse16`` +* ``__builtin_bitreverse32`` +* ``__builtin_bitreverse64`` + +**Syntax**: + +.. code-block:: c++ + __builtin_bitreverse32(x) + +**Examples**: + +.. code-block:: c++ + uint8_t rev_x = __builtin_bitreverse8(x); + uint16_t rev_x = __builtin_bitreverse16(x); + uint32_t rev_y = __builtin_bitreverse32(y); + uint64_t rev_z = __builtin_bitreverse64(z); + +**Description**: + +The '``__builtin_bitreverse``' family of builtins is used to reverse +the bitpattern of an integer value; for example ``0b1234567`` becomes +``0b7654321``. + ``__builtin_unreachable`` -------------------------
Index: test/CodeGen/builtins.c =================================================================== --- test/CodeGen/builtins.c +++ test/CodeGen/builtins.c @@ -117,9 +117,11 @@ P(bswap32, (N)); P(bswap64, (N)); + // CHECK: @llvm.bitreverse.i8 // CHECK: @llvm.bitreverse.i16 // CHECK: @llvm.bitreverse.i32 // CHECK: @llvm.bitreverse.i64 + P(bitreverse8, (N)); P(bitreverse16, (N)); P(bitreverse32, (N)); P(bitreverse64, (N)); Index: include/clang/Basic/Builtins.def =================================================================== --- include/clang/Basic/Builtins.def +++ include/clang/Basic/Builtins.def @@ -409,6 +409,7 @@ BUILTIN(__builtin_bswap32, "UiUi", "nc") BUILTIN(__builtin_bswap64, "ULLiULLi", "nc") +BUILTIN(__builtin_bitreverse8, "UcUc", "nc") BUILTIN(__builtin_bitreverse16, "UsUs", "nc") BUILTIN(__builtin_bitreverse32, "UiUi", "nc") BUILTIN(__builtin_bitreverse64, "ULLiULLi", "nc") Index: docs/LanguageExtensions.rst =================================================================== --- docs/LanguageExtensions.rst +++ docs/LanguageExtensions.rst @@ -1505,6 +1505,33 @@ Query for this feature with ``__has_builtin(__builtin_convertvector)``. +``__builtin_bitreverse`` +--------------------- + +* ``__builtin_bitreverse8`` +* ``__builtin_bitreverse16`` +* ``__builtin_bitreverse32`` +* ``__builtin_bitreverse64`` + +**Syntax**: + +.. code-block:: c++ + __builtin_bitreverse32(x) + +**Examples**: + +.. code-block:: c++ + uint8_t rev_x = __builtin_bitreverse8(x); + uint16_t rev_x = __builtin_bitreverse16(x); + uint32_t rev_y = __builtin_bitreverse32(y); + uint64_t rev_z = __builtin_bitreverse64(z); + +**Description**: + +The '``__builtin_bitreverse``' family of builtins is used to reverse +the bitpattern of an integer value; for example ``0b1234567`` becomes +``0b7654321``. + ``__builtin_unreachable`` -------------------------
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