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Add rotate and shift instructions with immediate amounts.

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This commit is contained in:
Jakob Stoklund Olesen
2016-08-19 14:27:29 -07:00
parent 202088837b
commit 08168e9d50
1 changed files with 38 additions and 7 deletions
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45
meta/cretonne/base.py
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@@ -444,6 +444,8 @@ bnot = Instruction(
# Shift/rotate. # Shift/rotate.
x = Operand('x', Int, doc='Scalar or vector value to shift') x = Operand('x', Int, doc='Scalar or vector value to shift')
y = Operand('y', iB, doc='Number of bits to shift') y = Operand('y', iB, doc='Number of bits to shift')
Y = Operand('Y', imm64)
a = Operand('a', Int) a = Operand('a', Int)
rotl = Instruction( rotl = Instruction(
@@ -462,6 +464,18 @@ rotr = Instruction(
""", """,
ins=(x, y), outs=a) ins=(x, y), outs=a)
rotl_imm = Instruction(
'rotl_imm', r"""
Rotate left by immediate.
""",
ins=(x, Y), outs=a)
rotr_imm = Instruction(
'rotr_imm', r"""
Rotate right by immediate.
""",
ins=(x, Y), outs=a)
ishl = Instruction( ishl = Instruction(
'ishl', r""" 'ishl', r"""
Integer shift left. Shift the bits in ``x`` towards the MSB by ``y`` Integer shift left. Shift the bits in ``x`` towards the MSB by ``y``
@@ -474,9 +488,6 @@ ishl = Instruction(
.. math:: .. math::
s &:= y \pmod B, \\ s &:= y \pmod B, \\
a &:= x \cdot 2^s \pmod{2^B}. a &:= x \cdot 2^s \pmod{2^B}.
.. todo:: Add ``ishl_imm`` variant with an immediate ``y``.
""", """,
ins=(x, y), outs=a) ins=(x, y), outs=a)
@@ -493,8 +504,6 @@ ushr = Instruction(
.. math:: .. math::
s &:= y \pmod B, \\ s &:= y \pmod B, \\
a &:= \lfloor x \cdot 2^{-s} \rfloor. a &:= \lfloor x \cdot 2^{-s} \rfloor.
.. todo:: Add ``ushr_imm`` variant with an immediate ``y``.
""", """,
ins=(x, y), outs=a) ins=(x, y), outs=a)
@@ -505,11 +514,33 @@ sshr = Instruction(
shift*. shift*.
The shift amount is masked to the size of the register. The shift amount is masked to the size of the register.
.. todo:: Add ``sshr_imm`` variant with an immediate ``y``.
""", """,
ins=(x, y), outs=a) ins=(x, y), outs=a)
ishl_imm = Instruction(
'ishl_imm', r"""
Integer shift left by immediate.
The shift amount is masked to the size of ``x``.
""",
ins=(x, Y), outs=a)
ushr_imm = Instruction(
'ushr_imm', r"""
Unsigned shift right by immediate.
The shift amount is masked to the size of the register.
""",
ins=(x, Y), outs=a)
sshr_imm = Instruction(
'sshr_imm', r"""
Signed shift right by immediate.
The shift amount is masked to the size of the register.
""",
ins=(x, Y), outs=a)
# #
# Bit counting. # Bit counting.
# #