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Define icmp and fcmp comparison instructions.

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Add new intcc and floatcc operand types for the immediate condition codes on
these instructions.

Add new IntCompare and FloatCompare instruction formats.

Add a generic match_enum() parser function that can match any identifier-like
enumerated operand kind that implements FromStr.

Define the icmp and fcmp instructions in case.py. Include documentation for the
condition codes with these two instructions.
This commit is contained in:
Jakob Stoklund Olesen
2016-07-07 11:20:56 -07:00
parent 90bb2fd27d
commit 86688053a6
9 changed files with 218 additions and 52 deletions
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57
docs/langref.rst
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@@ -270,6 +270,14 @@ indicate the different kinds of immediate operands on an instruction.
bits of the operand are interpreted as if the SIMD vector was loaded from
memory containing the immediate.
.. type:: intcc
An integer condition code. See the :inst:`icmp` instruction for details.
.. type:: floatcc
A floating point condition code. See the :inst:`fcmp` instruction for details.
The two IEEE floating point immediate types :type:`ieee32` and :type:`ieee64`
are displayed as hexadecimal floating point literals in the textual IL format.
Decimal floating point literals are not allowed because some computer systems
@@ -676,29 +684,7 @@ Vector operations
Integer operations
------------------
.. inst:: a = icmp Cond, x, y
Integer comparison.
:arg Cond: Condition code determining how ``x`` and ``y`` are compared.
:arg Int x: First value to compare.
:arg Int y: Second value to compare.
:result Logic a: With the same number of lanes as ``x`` and ``y``.
The condition code determines if the operands are interpreted as signed or
unsigned integers.
====== ======== =========
Signed Unsigned Condition
====== ======== =========
eq eq Equal
ne ne Not equal
slt ult Less than
sge uge Greater than or equal
sgt ugt Greater than
sle ule Less than or equal
====== ======== =========
.. autoinst:: icmp
.. autoinst:: iadd
.. autoinst:: iadd_imm
.. autoinst:: isub
@@ -784,30 +770,7 @@ Floating point operations
These operations generally follow IEEE 754-2008 semantics.
.. inst:: a = fcmp Cond, x, y
Floating point comparison.
:arg Cond: Condition code determining how ``x`` and ``y`` are compared.
:arg x,y: Floating point scalar or vector values of the same type.
:rtype: :type:`b1` or :type:`b1xN` with the same number of lanes as
``x`` and ``y``.
An 'ordered' condition code yields ``false`` if either operand is Nan.
An 'unordered' condition code yields ``true`` if either operand is Nan.
======= ========= =========
Ordered Unordered Condition
======= ========= =========
ord uno None (ord = no NaNs, uno = some NaNs)
oeq ueq Equal
one une Not equal
olt ult Less than
oge uge Greater than or equal
ogt ugt Greater than
ole ule Less than or equal
======= ========= =========
.. autoinst:: fcmp
.. inst:: fadd x,y