Differential D132793 Diff 456383 llvm/docs/LangRef.rst

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llvm/docs/LangRef.rst

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""""""""""		""""""""""

Return the same value as a corresponding libm '``fma``' function but without		Return the same value as a corresponding libm '``fma``' function but without
trapping or setting ``errno``.		trapping or setting ``errno``.

When specified with the fast-math-flag 'afn', the result may be approximated		When specified with the fast-math-flag 'afn', the result may be approximated
using a less accurate calculation.		using a less accurate calculation.

		.. _int_fabs:

'``llvm.fabs.*``' Intrinsic		'``llvm.fabs.*``' Intrinsic
^^^^^^^^^^^^^^^^^^^^^^^^^^^		^^^^^^^^^^^^^^^^^^^^^^^^^^^

Syntax:		Syntax:
"""""""		"""""""

This is an overloaded intrinsic. You can use ``llvm.fabs`` on any		This is an overloaded intrinsic. You can use ``llvm.fabs`` on any
floating-point or vector of floating-point type. Not all targets support		floating-point or vector of floating-point type. Not all targets support
▲ Show 20 Lines • Show All 4,649 Lines • ▼ Show 20 Lines	.. code-block:: llvm

%r = call <4 x float> @llvm.vp.fneg.v4f32(<4 x float> %a, <4 x i1> %mask, i32 %evl)		%r = call <4 x float> @llvm.vp.fneg.v4f32(<4 x float> %a, <4 x i1> %mask, i32 %evl)
;; For all lanes below %evl, %r is lane-wise equivalent to %also.r		;; For all lanes below %evl, %r is lane-wise equivalent to %also.r

%t = fneg <4 x float> %a		%t = fneg <4 x float> %a
%also.r = select <4 x i1> %mask, <4 x float> %t, <4 x float> undef		%also.r = select <4 x i1> %mask, <4 x float> %t, <4 x float> undef


		.. _int_vp_fabs:

		'``llvm.vp.fabs.*``' Intrinsics
		^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

		Syntax:
		"""""""
		This is an overloaded intrinsic.

		::

		declare <16 x float> @llvm.vp.fabs.v16f32 (<16 x float> <op>, <16 x i1> <mask>, i32 <vector_length>)
		declare <vscale x 4 x float> @llvm.vp.fabs.nxv4f32 (<vscale x 4 x float> <op>, <vscale x 4 x i1> <mask>, i32 <vector_length>)
		declare <256 x double> @llvm.vp.fabs.v256f64 (<256 x double> <op>, <256 x i1> <mask>, i32 <vector_length>)

		Overview:
		"""""""""

		Predicated floating-point absolute value of a vector of floating-point values.


		Arguments:
		""""""""""

		The first operand and the result have the same vector of floating-point type.
		The second operand is the vector mask and has the same number of elements as the
		result vector type. The third operand is the explicit vector length of the
		operation.

		Semantics:
		""""""""""

		The '``llvm.vp.fabs``' intrinsic performs floating-point absolute value
		(:ref:`fabs <int_fabs>`) of the first vector operand on each enabled lane. The
		result on disabled lanes is undefined.

		Examples:
		"""""""""

		.. code-block:: llvm

		%r = call <4 x float> @llvm.vp.fabs.v4f32(<4 x float> %a, <4 x i1> %mask, i32 %evl)
		;; For all lanes below %evl, %r is lane-wise equivalent to %also.r

		%t = call <4 x float> @llvm.fabs.v4f32(<4 x float> %a)
		%also.r = select <4 x i1> %mask, <4 x float> %t, <4 x float> undef


.. _int_vp_fma:		.. _int_vp_fma:

'``llvm.vp.fma.*``' Intrinsics		'``llvm.vp.fma.*``' Intrinsics
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^		^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Syntax:		Syntax:
"""""""		"""""""
This is an overloaded intrinsic.		This is an overloaded intrinsic.
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