16-bit Instructions (vs. 32-bit ARM instructions) Used to improve the code density About 30% reduction over ARM for the same code
Each Thumb instruction mapped to the equivalent ARM instruction: ADD r0, #3
서울대학교 컴퓨터공학부 내장형시스템특강 (L6.1)
2004학년도 제2학기 김지홍 1
Code Size: ARM vs. Thumb C-code if (x>=0) return x; else return -x; ARM assembly version 2 x 4 = 8 bytes iabs CMP r0,#0 ;Compare r0 to zero RSBLT r0,r0,#0 ;If r0 Thumb)
; branch exchange
CODE32 LDR r0, =thumbCode + 1 BLX r0
pc = Rm & 0xfffffffe T = Rm[0]
BLX Rm | label ; branch exchange w/link
lr = inst. addr after BLX + T pc = label, T = label[0] pc = Rm & 0xfffffffe, T = Rm[0]
서울대학교 컴퓨터공학부 내장형시스템특강 (L6.11)
2004학년도 제2학기 김지홍 11
CODE16 thumbCode ADD r1, #1 BX lr 서울대학교 컴퓨터공학부 내장형시스템특강 (L6.12)
2004학년도 제2학기 김지홍 12
BLX Example (Thumb Æ ARM)
Space: About 70% of ARM code # of Instructions: About 140% of ARM code Exec. Time:
CODE16 LDR r0, =ARMCode BLX r0 CODE32 ARMCode ADD r1, #1 BX lr 서울대학교 컴퓨터공학부 내장형시스템특강 (L6.13)
Thumb Advantages
; lr[0] was already set to 1. 2004학년도 제2학기 김지홍 13
With a 32-bit memory, ARM code is about 40% faster over Thumb code With a 16-bit memory, Thumb code is about 45% faster over ARM code
Thumb code consumes about 30% less memory power. 서울대학교 컴퓨터공학부 내장형시스템특강 (L6.14)
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