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Remove unnecessary branch instruction in crt0

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Thomas Winwood 2019-06-04 21:25:57 +01:00
parent 738301d47c
commit 4d3a287c6b
1 changed files with 7 additions and 7 deletions
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14
crt0.s
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@ -25,14 +25,14 @@ __start:
ldr r0, =__data_lma @ source address ldr r0, =__data_lma @ source address
ldr r1, =__data_start @ destination address ldr r1, =__data_start @ destination address
ldr r2, =__data_end ldr r2, =__data_end
sub r2, r2, r1 subs r2, r1 @ length
beq .Lskip @ don't try to copy an empty .data section @ these instructions are only executed if r2 is nonzero
add r2, #3 @ (i.e. don't bother copying an empty .data section)
mov r2, r2, asr #2 @ length (in words) addne r2, #3
add r2, #0x04000000 @ copy by words asrne r2, #2
swi 0xb0000 addne r2, #0x04000000
swine 0xb0000
.Lskip:
@ jump to user code @ jump to user code
ldr r0, =main ldr r0, =main
bx r0 bx r0