ruby-x/rubyx
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

use arm shift at runtime

Browse Source 
arm indexes are in bytes (x4) at compile time
but at runtime we only have the array indexes, iw word indexes
arm has the nice barrel shifter to save us an extra instruction
This commit is contained in:
Torsten Ruger 2015-11-19 12:48:13 +02:00
parent 4871a52d37
commit a8453c126d
2 changed files with 3 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Gemfile.lock
View File

@ -1,6 +1,6 @@
GIT
remote: git://github.com/salama/salama-arm.git
revision: 0a950de25a9d286fccf7d33834534a0c3a6d2682
revision: 00beb3703b57702e6d8d4743abf7eac2504a3c83
specs:
salama-arm (0.3.0)

6
lib/arm/translator.rb
View File

@ -38,20 +38,18 @@ module Arm
end
def translate_GetSlot code
# times 4 because arm works in bytes, but vm in words
if(code.index.is_a? Numeric)
ArmMachine.ldr( code.register , code.array , arm_index(code) )
else
ArmMachine.ldr( code.register , code.array , code.index )
ArmMachine.ldr( code.register , code.array , code.index , :shift_lsl => 2 )
end
end
def translate_SetSlot code
# times 4 because arm works in bytes, but vm in words
if(code.index.is_a? Numeric)
ArmMachine.str( code.register , code.array , arm_index(code) )
else
ArmMachine.str( code.register , code.array , code.index )
ArmMachine.str( code.register , code.array , code.index , :shift_lsl => 2 )
end
end