https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121582
Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2025-09-09
Ever confirmed|0 |1
Status|UNCONFIRMED |ASSIGNED
--- Comment #2 from Peter Bergner <bergner at gcc dot gnu.org> ---
Confirmed.
This isn't a Ascalon specific issue, but happens whenever we enable the
zvfbfwma extension while using the -mrvv-vector-bits=zvl option. For example:
linux:~$ gcc -S -O2 -march=rv64gcv_zvfbfwma -mrvv-vector-bits=zvl pr121582.i
pr121582.i: In function 'foo':
pr121582.i:3:22: error: unrecognizable insn:
3 | void foo() { v -= w; }
| ^
(insn 19 18 20 2 (set (reg:RVVMF2BF 149 [ _3 ])
(if_then_else:RVVMF2BF (unspec:RVVMF32BI [
(const_vector:RVVMF32BI [
(const_int 1 [0x1])
(const_int 0 [0]) repeated x3
])
(const_int 1 [0x1])
(const_int 0 [0])
(const_int 2 [0x2])
(const_int 0 [0])
(reg:SI 66 vl)
(reg:SI 67 vtype)
] UNSPEC_VPREDICATE)
(vec_duplicate:RVVMF2BF (reg:BF 160 [ _8 ]))
(reg:RVVMF2BF 149 [ _3 ]))) "pr121582.i":3:16 -1
(nil))
during RTL pass: vregs
