pftbest

static const uint8_t reverse_lookup[16] = {
    0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
    0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf,
};

uint8_t reverse_bits(uint8_t n)
{
    return (reverse_lookup[n & 0xf] << 4) | reverse_lookup[n >> 4];
}

pftbest

/*===- TableGen'erated file -------------------------------------*- C++ -*-===*\
|*                                                                            *|
|* DAG Instruction Selector for the MSP430 target                             *|
|*                                                                            *|
|* Automatically generated file, do not edit!                                 *|
|*                                                                            *|
\*===----------------------------------------------------------------------===*/

// *** NOTE: This file is #included into the middle of the target
// *** instruction selector class.  These functions are really methods.

pftbest

target triple = "msp430-none-elf"

@bar = global i32 0, align 2

define void @foo() {
start:
  %0 = load i32, i32* @bar, align 2
  %1 = add i32 %0, 1
  store i32 %1, i32* @bar, align 2
  ret void

pftbest

diff --git a/lib/Target/MSP430/MSP430InstrInfo.td b/lib/Target/MSP430/MSP430InstrInfo.td
index cec43040f60..44869e78649 100644
--- a/lib/Target/MSP430/MSP430InstrInfo.td
+++ b/lib/Target/MSP430/MSP430InstrInfo.td
@@ -1178,6 +1178,8 @@ def : Pat<(store (addc (load addr:$dst), GR16:$src), addr:$dst),
           (ADD16mr addr:$dst, GR16:$src)>;
 def : Pat<(store (addc (load addr:$dst), (i16 (load addr:$src))), addr:$dst),
           (ADD16mm addr:$dst, addr:$src)>;
+def : Pat<(store (addc (load addr:$dst), (i16 imm:$src)), addr:$dst),
+          (ADD16mi addr:$dst, imm:$src)>;

pftbest

//===-- MSP430InstrInfo.td - MSP430 Instruction defs -------*- tablegen -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source 
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file describes the MSP430 instructions in TableGen format.

pftbest

$ ./llvm-build/bin/llc func.ll -debug-only=isel



=== foo
Initial selection DAG: BB#0 'foo:start'
SelectionDAG has 9 nodes:
  t2: i16 = Constant<0>
    t0: ch = EntryToken
  t4: i32,ch = load<LD4[@bar](align=2)(dereferenceable)> t0, GlobalAddress:i16<i32* @bar> 0, undef:i16

pftbest

extern crate core;

use core::default::Default;
use core::sync::atomic::{AtomicUsize, Ordering};
use core::cell::UnsafeCell;

const RING_SIZE: usize = 32;

pub struct Ring<T: Clone + Copy> {
    head: AtomicUsize,

pftbest

#include "ring.h"

int ring_add(ring_t *ring, ring_data_t data)
{
    ring_pos_t next_head = (ring->head + 1) % RING_SIZE;
    if (next_head != ring->tail) {
        ring->data[ring->head] = data;
        ring->head = next_head;
        return 0;
    } else {

pftbest

use std::str;
use std::process;
use std::fs::File;
use std::io::{BufRead, BufReader};
use std::collections::HashMap;

fn main() {
    let mut args = std::env::args();
    if args.len() < 4 {
        let prog = args.next().unwrap();

pftbest

From b239677c8dd4a574ab7407a4a2539d3f15857c91 Mon Sep 17 00:00:00 2001
From: Vadzim Dambrouski <[email protected]>
Date: Thu, 18 May 2017 20:51:55 +0300
Subject: [PATCH] [MSP430] Add subtarget features for hardware multiplier.

---
 lib/Target/MSP430/MSP430.td              | 15 ++++++++++++++-
 lib/Target/MSP430/MSP430ISelLowering.cpp | 27 +++------------------------
 lib/Target/MSP430/MSP430Subtarget.cpp    | 27 ++++++++++++++++++++++++++-
 lib/Target/MSP430/MSP430Subtarget.h      | 11 +++++++++++