[PowerPC] Add the support for __builtin_setrnd() in clang
Summary:
PowerPC64/PowerPC64le supports the builtin function __builtin_setrnd to set the floating point rounding mode. This function will use the least significant two bits of integer argument to set the floating point rounding mode.
double __builtin_setrnd(int mode);
The effective values for mode are:
0 - round to nearest
1 - round to zero
2 - round to +infinity
3 - round to -infinity
Note that the mode argument will modulo 4, so if the int argument is greater than 3, it will only use the least significant two bits of the mode. Namely, builtin_setrnd(102)) is equal to builtin_setrnd(2).
Reviewed By: jsji
Differential Revision: https://reviews.llvm.org/D59403
llvm-svn: 357242
diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst
index d4c40b2..d79d412 100644
--- a/clang/docs/LanguageExtensions.rst
+++ b/clang/docs/LanguageExtensions.rst
@@ -2376,6 +2376,78 @@
movl %gs:(%eax), %eax
ret
+PowerPC Language Extensions
+------------------------------
+
+Set the Floating Point Rounding Mode
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+PowerPC64/PowerPC64le supports the builtin function ``__builtin_setrnd`` to set
+the floating point rounding mode. This function will use the least significant
+two bits of integer argument to set the floating point rounding mode.
+
+.. code-block:: c++
+
+ double __builtin_setrnd(int mode);
+
+The effective values for mode are:
+
+ - 0 - round to nearest
+ - 1 - round to zero
+ - 2 - round to +infinity
+ - 3 - round to -infinity
+
+Note that the mode argument will modulo 4, so if the int argument is greater
+than 3, it will only use the least significant two bits of the mode.
+Namely, ``__builtin_setrnd(102))`` is equal to ``__builtin_setrnd(2)``.
+
+PowerPC Language Extensions
+------------------------------
+
+Set the Floating Point Rounding Mode
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+PowerPC64/PowerPC64le supports the builtin function ``__builtin_setrnd`` to set
+the floating point rounding mode. This function will use the least significant
+two bits of integer argument to set the floating point rounding mode.
+
+.. code-block:: c++
+
+ double __builtin_setrnd(int mode);
+
+The effective values for mode are:
+
+ - 0 - round to nearest
+ - 1 - round to zero
+ - 2 - round to +infinity
+ - 3 - round to -infinity
+
+Note that the mode argument will modulo 4, so if the integer argument is greater
+than 3, it will only use the least significant two bits of the mode.
+Namely, ``__builtin_setrnd(102))`` is equal to ``__builtin_setrnd(2)``.
+
+PowerPC Language Extensions
+------------------------------
+
+Set the Floating Point Rounding Mode
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+PowerPC64/PowerPC64le supports the builtin function ``__builtin_setrnd`` to set
+the floating point rounding mode. This function will use the least significant
+two bits of integer argument to set the floating point rounding mode.
+
+.. code-block:: c++
+
+ double __builtin_setrnd(int mode);
+
+The effective values for mode are:
+
+ - 0 - round to nearest
+ - 1 - round to zero
+ - 2 - round to +infinity
+ - 3 - round to -infinity
+
+Note that the mode argument will modulo 4, so if the integer argument is greater
+than 3, it will only use the least significant two bits of the mode.
+Namely, ``__builtin_setrnd(102))`` is equal to ``__builtin_setrnd(2)``.
+
Extensions for Static Analysis
==============================