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Add a llvm.copysign intrinsic

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This adds a llvm.copysign intrinsic; We already have Libfunc recognition for
copysign (which is turned into the FCOPYSIGN SDAG node). In order to
autovectorize calls to copysign in the loop vectorizer, we need a corresponding
intrinsic as well.

In addition to the expected changes to the language reference, the loop
vectorizer, BasicTTI, and the SDAG builder (the intrinsic is transformed into
an FCOPYSIGN node, just like the function call), this also adds FCOPYSIGN to a
few lists in LegalizeVector{Ops,Types} so that vector copysigns can be
expanded.

In TargetLoweringBase::initActions, I've made the default action for FCOPYSIGN
be Expand for vector types. This seems correct for all in-tree targets, and I
think is the right thing to do because, previously, there was no way to generate
vector-values FCOPYSIGN nodes (and most targets don't specify an action for
vector-typed FCOPYSIGN).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188728 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
2013-08-19 23:35:46 +00:00
parent 30cbccb029
commit 66d1fa6f4b
10 changed files with 117 additions and 0 deletions
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36
docs/LangRef.rst
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@@ -7353,6 +7353,42 @@ Semantics:
This function returns the same values as the libm ``fabs`` functions
would, and handles error conditions in the same way.
'``llvm.copysign.*``' Intrinsic
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Syntax:
"""""""
This is an overloaded intrinsic. You can use ``llvm.copysign`` on any
floating point or vector of floating point type. Not all targets support
all types however.
::
declare float @llvm.copysign.f32(float %Mag, float %Sgn)
declare double @llvm.copysign.f64(double %Mag, double %Sgn)
declare x86_fp80 @llvm.copysign.f80(x86_fp80 %Mag, x86_fp80 %Sgn)
declare fp128 @llvm.copysign.f128(fp128 %Mag, fp128 %Sgn)
declare ppc_fp128 @llvm.copysign.ppcf128(ppc_fp128 %Mag, ppc_fp128 %Sgn)
Overview:
"""""""""
The '``llvm.copysign.*``' intrinsics return a value with the magnitude of the
first operand and the sign of the second operand.
Arguments:
""""""""""
The arguments and return value are floating point numbers of the same
type.
Semantics:
""""""""""
This function returns the same values as the libm ``copysign``
functions would, and handles error conditions in the same way.
'``llvm.floor.*``' Intrinsic
^^^^^^^^^^^^^^^^^^^^^^^^^^^^