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sim: pru: Add support for LMBD instruction

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Binutils support for LMBD instruction was merged [1]. So add it also
to simulator.

LMBD instruction does left-most-bit-detection. It returns 32 if
the given bit value is not found in the provided word value.

[1] https://sourceware.org/pipermail/binutils/2020-October/113901.html

sim/pru/ChangeLog:

	* pru.h (RS1SEL): New macro.
	(RS1_WIDTH): New macro.
	* pru.isa: Describe the LMBD instruction.

sim/testsuite/sim/pru/ChangeLog:

	* lmbd.s: New test.
This commit is contained in:
Dimitar Dimitrov 2020-11-12 22:23:26 +02:00
parent 1350c3b47a
commit e57cf1f2cd
5 changed files with 88 additions and 0 deletions
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6
sim/pru/ChangeLog
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@ -1,3 +1,9 @@
2020-11-12 Dimitar Dimitrov <dimitar@dinux.eu>
* pru.h (RS1SEL): New macro.
(RS1_WIDTH): New macro.
* pru.isa: Describe the LMBD instruction.
2019-09-23 Dimitar Dimitrov <dimitar@dinux.eu>
* Makefile.in: New file.

2
sim/pru/pru.h
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@ -58,6 +58,8 @@
#define XBBO_BASEREG (CPU.regs[GET_INSN_FIELD (RS1, inst)])
#define RS1SEL GET_INSN_FIELD (RS1SEL, inst)
#define RS1_WIDTH regsel_width (RS1SEL)
#define RDSEL GET_INSN_FIELD (RDSEL, inst)
#define RD_WIDTH regsel_width (RDSEL)
#define RD_REGN GET_INSN_FIELD (RD, inst)

15
sim/pru/pru.isa
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@ -247,3 +247,18 @@ INSTRUCTION (iloop,
LOOP_IN_PROGRESS = 1;
PC++;
})
INSTRUCTION (lmbd,
{
int lmbd_i;
OP2 = (IO ? IMM8 : RS2);
for (lmbd_i = RS1_WIDTH - 1; lmbd_i >= 0; lmbd_i--)
{
if (!(((RS1 >> lmbd_i) ^ OP2) & 1))
break;
}
RD = (lmbd_i < 0) ? 32 : lmbd_i;
PC++;
})

4
sim/testsuite/sim/pru/ChangeLog
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@ -1,3 +1,7 @@
2020-11-12 Dimitar Dimitrov <dimitar@dinux.eu>
* lmbd.s: New test.
2019-09-23 Dimitar Dimitrov <dimitar@dinux.eu>
* add.s: New test.

61
sim/testsuite/sim/pru/lmbd.s Normal file
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@ -0,0 +1,61 @@
# Check that lmbd insn works.
# mach: pru
# Copyright (C) 2020 Free Software Foundation, Inc.
# Contributed by Dimitar Dimitrov <dimitar@dinux.eu>
#
# This file is part of the GNU simulators.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
.include "testutils.inc"
start
ldi32 r14, 0xffffffff
ldi32 r15, 0x0
ldi32 r16, 0x40000000
ldi32 r17, 8
lmbd r0, r14, 0
qbne 2f, r0, 32
lmbd r0, r14, 1
qbne 2f, r0, 31
lmbd r0, r15, 1
qbne 2f, r0, 32
lmbd r0, r15, 0
qbne 2f, r0, 31
lmbd r0, r16, r15
qbne 2f, r0, 31
lmbd r0, r16, 1
qbne 2f, r0, 30
lmbd r0, r14.w1, 1
qbne 2f, r0, 15
lmbd r0, r17.b0, 1
qbne 2f, r0, 3
lmbd r0, r17.b0, r15
qbne 2f, r0, 7
1:
pass
2: fail