http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59289
Bug ID: 59289
Summary: [ARM] regression on unsigned-extend-2.c
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: christophe.lyon at st dot com
Since commit 203160 (New rtx costs infrastructure for ARM), I have noticed that
gcc.target/arm/unsigned-extend-2.c scan-assembler ands
gcc.target/arm/unsigned-extend-2.c scan-assembler-not cmp
now FAIL (used to PASS).
I have configured GCC as:
target: arm-none-linux-gnueabihf
mode: thumb
cpu: cortex-a15
fpu: neon-vfpv4
With r203159:
movs r3, #8
.L3:
lsrs r0, r0, #1
subs r3, r3, #1
ands r3, r3, #255
bne .L3
bx lr
with r203160:
movs r3, #0
.L3:
lsrs r0, r0, #1
adds r3, r3, #1
cmp r3, #8
bne .L3
bx lr
It seems that code gen has slightly evolved in trunk since r203160, but the
test still fails.
The code sequence does not seem really worse than the original one, but the
testcase should at least be updated.
