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expand constant load

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slightly hacky, but in good tradition
previous implementation only worked until 16 significant bits, which is getting to little
this one just keeps adding more instructions to arrive at the constant by force
There are surely cleverer ways of doing this, ie by using the barrel shifter
A start on #15, admittedly a hack
This commit is contained in:
Torsten Ruger
2018-08-31 23:28:31 +03:00
parent b2339dc330
commit c3b026a180
2 changed files with 30 additions and 17 deletions
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10
test/arm/test_logic.rb
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@ -76,11 +76,11 @@ module Arm
code = @machine.add( :r1 , :r2 , :r3 , shift_lsr: 8)
assert_code code , :add , [0x23,0x14,0x92,0xe0] #e0 92 14 23
end
def test_big_add
def test_add_big
code = @machine.add :r1 , :r1, 0x220
assert_code code , :add , [0x22,0x1e,0x91,0xe2] #e2 91 1e 22
end
def test_too_big_add
def test_add_2ins
code = @machine.add :r1 , :r1, 0x222
Risc::Position.create(code).set(0)
# add 0x02 (first instruction) and then 0x220 shifted
@ -88,6 +88,12 @@ module Arm
# added extra instruction to add "extra"
assert_code code.next , :add , [0x22,0x10,0x91,0xe2] #e2 91 10 22
end
def test_add_3ins
code = @machine.add :r1 , :r1, 0x29d84
assert_code code , :add , [0x02,0x18,0x91,0xe2]
assert_code code.next , :add , [0x9d,0x1c,0x91,0xe2]
assert_code code.next.next , :add , [0x84,0x10,0x91,0xe2]
end
def label( pos = 0x22 + 8)
addr = FakeAddress.new(pos)