https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105879
Bug ID: 105879
Summary: DI mode constants are incorrectly loaded into
registers on big-endian xtensa
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: jcmvbkbc at gcc dot gnu.org
Target Milestone: ---
A lot of testsuite tests are failing in big-endian xtensa configuration, e.g.
gcc.c-torture/execute/20001031-1.c
For the following part
long long t4 (void)
{
long long i;
t3 ((i = 4096) + 0x7fffffffULL);
return i;
}
in the generated assembly I see the following:
.literal .LC7, -2147479553
.literal .LC8, t3@PLT
.literal .LC9, 4096
.align 4
.global t4
.type t4, @function
t4:
entry sp, 32
movi.n a3, 0
l32r a10, .LC7
mov.n a11, a3
l32r a8, .LC8
callx8 a8
l32r a2, .LC9
retw.n
(i.e. 0 in a11), while it should've been the following (i.e. 0 in a10):
.literal .LC7, -2147479553
.literal .LC8, t3@PLT
.literal .LC9, 4096
.align 4
.global t4
.type t4, @function
t4:
entry sp, 32
movi.n a2, 0
mov.n a10, a2
l32r a11, .LC7
l32r a8, .LC8
callx8 a8
l32r a3, .LC9
retw.n
This regression clearly traces back to the commit 64a54505ec82 ("gcc: xtensa:
rearrange DI mode constant loading") and is present in gcc-11.1+ and gcc-12.1
