Class: Wardite::F32

Inherits:
Object
  • Object
show all
Includes:
ValueHelper
Defined in:
lib/wardite/value.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ValueHelper

#F32, #F64, #I32, #I64

Instance Attribute Details

#value ⇒ Object

: Float



400
401
402
 
# File 'lib/wardite/value.rb', line 400

def value
  @value
end

Class Method Details

.from_bytes(str) ⇒ Object 



404
405
406
407
408
409
410
 
# File 'lib/wardite/value.rb', line 404

def self.from_bytes(str)
  v = str.unpack("e")[0]
  if !v.is_a?(Float)
    raise "broken string or unsupported size: #{str.inspect} -> 4"
  end
  Wardite::F32(v)
end

Instance Method Details

#==(other) ⇒ Object 



597
598
599
 
# File 'lib/wardite/value.rb', line 597

def ==(other)
  return self.class == other.class && self.value == other.value
end

#convert_s(to:) ⇒ Object

Raises:



542
543
544
 
# File 'lib/wardite/value.rb', line 542

def convert_s(to:)
  raise EvalError, "unsupported operation"
end

#convert_u(to:) ⇒ Object

Raises:



548
549
550
 
# File 'lib/wardite/value.rb', line 548

def convert_u(to:)
  raise EvalError, "unsupported operation"
end

#demote(to:) ⇒ Object

Raises:



554
555
556
 
# File 'lib/wardite/value.rb', line 554

def demote(to:)
  raise EvalError, "unsupported operation"
end

#extend_s(to:) ⇒ Object

Raises:



440
441
442
 
# File 'lib/wardite/value.rb', line 440

def extend_s(to:)
  raise EvalError, "unsupported operation"
end

#extend_u(to:) ⇒ Object

Raises:



446
447
448
 
# File 'lib/wardite/value.rb', line 446

def extend_u(to:)
  raise EvalError, "unsupported operation"
end

#extendN_s(from:, to:) ⇒ Object

Raises:



577
578
579
 
# File 'lib/wardite/value.rb', line 577

def extendN_s(from:, to:)
  raise EvalError, "unsupported operation"
end

#inspect ⇒ Object 



593
594
595
 
# File 'lib/wardite/value.rb', line 593

def inspect
  "F32(#{@value})"
end

#memsize ⇒ Object 



413
414
415
 
# File 'lib/wardite/value.rb', line 413

def memsize
  32
end

#packed(size: nil) ⇒ Object 



428
429
430
 
# File 'lib/wardite/value.rb', line 428

def packed(size: nil)
  [self.value].pack("e")
end

#promote(to:) ⇒ Object

Raises:



560
561
562
563
 
# File 'lib/wardite/value.rb', line 560

def promote(to:)
  raise EvalError, "unsupported operation" if to != :f64
  F64(value)
end

#reinterpret(to:) ⇒ Object

Raises:



567
568
569
570
571
572
 
# File 'lib/wardite/value.rb', line 567

def reinterpret(to:)
  raise EvalError, "unsupported operation" if to != :i32
  v = [value].pack("f").unpack("I!")[0]
  raise EvalError, "[BUG] String#unpack is broke, really?" if !v.is_a?(Integer)
  I32(v)
end

#sign ⇒ Object 



418
419
420
421
422
423
424
 
# File 'lib/wardite/value.rb', line 418

def sign
  upper = [0.0].pack("G")[0]&.ord&.<<(7)
  if !upper
    raise "[BUG] Array#pack looks broken?"
  end
  upper.zero? ? :positive : :negative
end

#trunc_s(to:, saturating: false) ⇒ Object

TODO:

need more testcase…

See Also:



456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
 
# File 'lib/wardite/value.rb', line 456

def trunc_s(to:, saturating: false)
  v = value.to_i
  case to
  when :i32
    if v >= 0
      i32_signed_max = I32::I32_MAX >> 1
      if saturating
        v = i32_signed_max if v > i32_signed_max
      else
        v = v & i32_signed_max
      end
      I32(v & i32_signed_max)
    else
      i32_signed_min = -(I32::I32_MAX >> 1) - 1
      if saturating
        v = i32_signed_min if v < i32_signed_min
      else
        v = v & I32::I32_MAX
        if (v >> 31).zero?
          raise EvalError, "[undefined behavior] detected overflow: #{value}"
        end
      end
      I32(v)
    end
  when :i64
    if v >= 0
      i64_signed_max = I64::I64_MAX >> 1
      if saturating
        v = i64_signed_max if v > i64_signed_max
      else
        v = v & i64_signed_max
      end
      I64(v & i64_signed_max)
    else
      i64_signed_min = -(I64::I64_MAX >> 1) - 1
      if saturating
        v = i64_signed_min if v < i64_signed_min
      else
        v = v & I64::I64_MAX
        if (v >> 63).zero?
          raise EvalError, "[undefined behavior] detected overflow: #{value}"
        end
      end
      I64(v)
    end
  else
    raise EvalError, "unsupported operation to: #{to}"
  end
end

#trunc_sat_s(to:) ⇒ Object 



589
590
591
 
# File 'lib/wardite/value.rb', line 589

def trunc_sat_s(to:)
  trunc_s(to: to, saturating: true)
end

#trunc_sat_u(to:) ⇒ Object 



583
584
585
 
# File 'lib/wardite/value.rb', line 583

def trunc_sat_u(to:)
  trunc_u(to: to, saturating: true)
end

#trunc_u(to:, saturating: false) ⇒ Object

See Also:



511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
 
# File 'lib/wardite/value.rb', line 511

def trunc_u(to:, saturating: false)
  v = value.to_i
  if v < 0
    if saturating
      v = 0
    else
      raise EvalError, "[undefined behavior] unexpected negative value"
    end
  end
  case to
  when :i32
    if saturating
      v = I32::I32_MAX if v > I32::I32_MAX
    else
      v = v & I32::I32_MAX
    end
    I32(v)
  when :i64
    if saturating
      v = I64::I64_MAX if v > I64::I64_MAX
    else
      v = v & I64::I64_MAX
    end
    I64(v)
  else
    raise EvalError, "unsupported operation to: #{to}"
  end
end

#wrap(to:) ⇒ Object

Raises:



434
435
436
 
# File 'lib/wardite/value.rb', line 434

def wrap(to:)
  raise EvalError, "unsupported operation"
end