https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116604
Bug ID: 116604
Summary: [15 regression] regressions on aarch64 since
r15-1619-g3b9b8d6cfdf593
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Keywords: testsuite-fail
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: thiago.bauermann at linaro dot org
CC: jskumari at gcc dot gnu.org
Target Milestone: ---
Target: aarch64
Since commit r15-1619-g3b9b8d6cfdf593 we see this vectorization regression on
aarch64-linux-gnu:
Running gcc:gcc.target/aarch64/sve/pcs/aarch64-sve-pcs.exp ...
FAIL: gcc.target/aarch64/sve/pcs/args_1.c -march=armv8.2-a+sve
-fno-stack-protector check-function-bodies callee_pred
The failure is:
body: \taddvl sp, sp, #-1
\tstr p[0-9]+, \[sp\]
\tstr p[0-9]+, \[sp, #1, mul vl\]
\tldr (p[0-9]+), \[x0\]
\tldr (p[0-9]+), \[x1\]
\tbrkpa (p[0-7])\.b, p0/z, p1\.b, p2\.b
\tbrkpb (p[0-7])\.b, \3/z, p3\.b, \1\.b
\tbrka p0\.b, \4/z, \2\.b
\tldr p[0-9]+, \[sp\]
\tldr p[0-9]+, \[sp, #1, mul vl\]
\taddvl sp, sp, #1
\tret
against: addvl sp, sp, #-1
str p14, [sp]
str p15, [sp, #1, mul vl]
mov p14.b, p3.b
ldr p15, [x0]
ldr p3, [x1]
brkpa p0.b, p0/z, p1.b, p2.b
brkpb p0.b, p0/z, p14.b, p15.b
brka p0.b, p0/z, p3.b
ldr p14, [sp]
ldr p15, [sp, #1, mul vl]
addvl sp, sp, #1
ret
The difference in expected vs actual is that there's an extra instruction "mov
p14.b, p3.b", and also in the brkpb instruction p14.b is used instead of the
expected p3.b.
We also see regressions in other testcases on arm-linux-gnueabihf and yet
others on arm-none-eabi, but I'll file separate bugzillas for those.
