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Diffstat (limited to 'docs/LangRef.rst')
| -rw-r--r-- | docs/LangRef.rst | 33 |
1 files changed, 15 insertions, 18 deletions
diff --git a/docs/LangRef.rst b/docs/LangRef.rst index 2e339183ef11..e063f6bd35fe 100644 --- a/docs/LangRef.rst +++ b/docs/LangRef.rst @@ -6691,15 +6691,14 @@ Semantics: The value produced is ``op1`` \* 2\ :sup:`op2` mod 2\ :sup:`n`, where ``n`` is the width of the result. If ``op2`` is (statically or dynamically) equal to or larger than the number of bits in -``op1``, the result is undefined. If the arguments are vectors, each -vector element of ``op1`` is shifted by the corresponding shift amount -in ``op2``. +``op1``, this instruction returns a :ref:`poison value <poisonvalues>`. +If the arguments are vectors, each vector element of ``op1`` is shifted +by the corresponding shift amount in ``op2``. -If the ``nuw`` keyword is present, then the shift produces a :ref:`poison -value <poisonvalues>` if it shifts out any non-zero bits. If the -``nsw`` keyword is present, then the shift produces a :ref:`poison -value <poisonvalues>` if it shifts out any bits that disagree with the -resultant sign bit. +If the ``nuw`` keyword is present, then the shift produces a poison +value if it shifts out any non-zero bits. +If the ``nsw`` keyword is present, then the shift produces a poison +value it shifts out any bits that disagree with the resultant sign bit. Example: """""""" @@ -6742,13 +6741,12 @@ Semantics: This instruction always performs a logical shift right operation. The most significant bits of the result will be filled with zero bits after the shift. If ``op2`` is (statically or dynamically) equal to or larger -than the number of bits in ``op1``, the result is undefined. If the -arguments are vectors, each vector element of ``op1`` is shifted by the -corresponding shift amount in ``op2``. +than the number of bits in ``op1``, this instruction returns a :ref:`poison +value <poisonvalues>`. If the arguments are vectors, each vector element +of ``op1`` is shifted by the corresponding shift amount in ``op2``. If the ``exact`` keyword is present, the result value of the ``lshr`` is -a :ref:`poison value <poisonvalues>` if any of the bits shifted out are -non-zero. +a poison value if any of the bits shifted out are non-zero. Example: """""""" @@ -6793,13 +6791,12 @@ Semantics: This instruction always performs an arithmetic shift right operation, The most significant bits of the result will be filled with the sign bit of ``op1``. If ``op2`` is (statically or dynamically) equal to or larger -than the number of bits in ``op1``, the result is undefined. If the -arguments are vectors, each vector element of ``op1`` is shifted by the -corresponding shift amount in ``op2``. +than the number of bits in ``op1``, this instruction returns a :ref:`poison +value <poisonvalues>`. If the arguments are vectors, each vector element +of ``op1`` is shifted by the corresponding shift amount in ``op2``. If the ``exact`` keyword is present, the result value of the ``ashr`` is -a :ref:`poison value <poisonvalues>` if any of the bits shifted out are -non-zero. +a poison value if any of the bits shifted out are non-zero. Example: """""""" |