vshll.u16 workaround for https://lists.freedesktop.org/archives/pixman/2011-March/001110.html

objdump2s.rb

#!/usr/bin/env ruby

$data = {}
$func_name = nil

# binutils confuses the sizes of the first and the second arguments
# this function contains a fixup workaround
def fixup_vshll(l)
  if l =~ /(.*vshll.u16\s+)d(\d+),\s*q(\d+)(.*)/
    reg1 = $2.to_i
    reg2 = $3.to_i
    sprintf("%sq%d, d%d%s", $1, reg1 / 2, reg2 * 2, $4)
  else
    l
  end
end

File.open(ARGV[0]).each_line {|l|
    if l =~ /[0-9a-fA-f]{8} \<(.*)\>/ then
    $func_name = $1
    $data[$func_name] = [] if !$data.has_key?($func_name)
    else
    if $func_name && l =~ /\s*\w+\:\s+\w+\s+/ then
        $data[$func_name].push(l.strip)
    end
    end
}

def process_func(func_name, a)
    # collect information about labels
    labels = {}
    label_index = 0
    a.each {|l|
    next if not l =~ /(\w+)\s+\<([^\+]+).*\>$/
    if $2 != func_name then
        printf("\n/* %s has an external reference - skipped */\n", func_name)
        return
    end
    if !labels.has_key?($1) then
        labels[$1] = label_index
        label_index += 1
    end
    }
    # print code
    printf("\n.global %s\n", func_name)
    printf("%s:\n", func_name)
    a.each {|l|
    next if not l =~ /\s*(\w+)\:\s+\w+\s+(.*)/
    addr = $1
    cmd = $2
    if labels.has_key?(addr) then
        printf("%d:", labels[addr])
    end
    if cmd =~ /(.*?)(\w+)\s+\<.*\>$/ then
        prefix = $1
        target_addr = $2
        if target_addr.to_i(16) > addr.to_i(16) then
	cmd = prefix + labels[target_addr].to_s + "f"
        else
	cmd = prefix + labels[target_addr].to_s + "b"
        end
    end
    cmd.gsub!(/\s*\;\s*\w+/, "")
    printf("\t%s\n", fixup_vshll(cmd))
    }
end

printf(".text\n")
printf(".fpu neon\n")
printf(".syntax unified\n\n")

$data.each {|func_name, a|
    process_func(func_name, a)
}