[Bug target/83768] ARM: wrong optimization
ktkachov at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Wed Jan 10 16:16:00 GMT 2018
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83768
ktkachov at gcc dot gnu.org changed:
What |Removed |Added
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CC| |ktkachov at gcc dot gnu.org
--- Comment #1 from ktkachov at gcc dot gnu.org ---
I can't reproduce it with a 5.4.1, I get:
.cpu arm10tdmi
.fpu vfp
.eabi_attribute 20, 1
.eabi_attribute 21, 1
.eabi_attribute 23, 3
.eabi_attribute 24, 1
.eabi_attribute 25, 1
.eabi_attribute 26, 2
.eabi_attribute 30, 2
.eabi_attribute 34, 0
.eabi_attribute 18, 4
.arm
.syntax divided
.file "away.c"
.text
.align 2
.global clean
.type clean, %function
clean:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
@ link register save eliminated.
cmp r1, #0
addgt r3, r0, r1
movgt r2, #0
ble .L7
.L4:
strb r2, [r0], #1
cmp r3, r0
bne .L4
bx lr
.L7:
bx lr
.size clean, .-clean
.ident "GCC: 5.4.1 20170805"
.section .note.GNU-stack,"",%progbits
I also can't reproduce with any compiler I have access to from 4.8 until
current trunk. Do you see this with an earlier compiler like 4.9 as well?
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