It's the warning I see every time I build GCC:
In file included from /home/marxin/Programming/gcc/gcc/coretypes.h:478,
from /home/marxin/Programming/gcc/gcc/expmed.cc:26:
In function ‘poly_uint16 mode_to_bytes(machine_mode)’,
inlined from ‘typename if_nonpoly<typename T::measurement_type>::type
GET_MODE_SIZE(const T&) [with T = scalar_int_mode]’ at
/home/marxin/Programming/gcc/gcc/machmode.h:647:24,
inlined from ‘rtx_def* emit_store_flag_1(rtx, rtx_code, rtx, rtx,
machine_mode, int, int, machine_mode)’ at
/home/marxin/Programming/gcc/gcc/expmed.cc:5728:56:
/home/marxin/Programming/gcc/gcc/machmode.h:550:49: warning: ‘*(unsigned
int*)((char*)&int_mode + offsetof(scalar_int_mode, scalar_int_mode::m_mode))’
may be used uninitialized [-Wmaybe-uninitialized]
550 | ? mode_size_inline (mode) : mode_size[mode]);
| ^~~~
/home/marxin/Programming/gcc/gcc/expmed.cc: In function ‘rtx_def*
emit_store_flag_1(rtx, rtx_code, rtx, rtx, machine_mode, int, int,
machine_mode)’:
/home/marxin/Programming/gcc/gcc/expmed.cc:5657:19: note: ‘*(unsigned
int*)((char*)&int_mode + offsetof(scalar_int_mode, scalar_int_mode::m_mode))’
was declared here
5657 | scalar_int_mode int_mode;
| ^~~~~~~~
Can we please mitigate it?
gcc/ChangeLog:
* expmed.cc (emit_store_flag_1): Mitigate -Wmaybe-uninitialized
warning.
---
gcc/expmed.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/expmed.cc b/gcc/expmed.cc
index 41738c1efe9..f23d63471ea 100644
--- a/gcc/expmed.cc
+++ b/gcc/expmed.cc
@@ -5654,7 +5654,7 @@ emit_store_flag_1 (rtx target, enum rtx_code code, rtx
op0, rtx op1,
/* If we are comparing a double-word integer with zero or -1, we can
convert the comparison into one involving a single word. */
- scalar_int_mode int_mode;
+ scalar_int_mode int_mode = {};
if (is_int_mode (mode, &int_mode)
&& GET_MODE_BITSIZE (int_mode) == BITS_PER_WORD * 2
&& (!MEM_P (op0) || ! MEM_VOLATILE_P (op0)))
--
2.36.1
