https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114988
Bug ID: 114988
Summary: RISC-V: ICE in intrinsic __riscv_vfwsub_wf_f32mf2
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: juzhe.zhong at rivai dot ai
Target Milestone: ---
https://godbolt.org/z/ncxrx3fK9
#include <stdint.h>
#include <riscv_vector.h>
vfloat32mf2_t test_vfwsub_wf_f32mf2(vfloat32mf2_t vs2, _Float16 rs1, size_t vl)
{
return __riscv_vfwsub_wf_f32mf2(vs2, rs1, vl);
}
with -march=rv64gcv -O3:
<source>:6:1: error: unrecognizable insn:
6 | }
| ^
(insn 8 5 12 2 (set (reg:RVVMF2SF 134 [ <retval> ])
(if_then_else:RVVMF2SF (unspec:RVVMF64BI [
(const_vector:RVVMF64BI repeat [
(const_int 1 [0x1])
])
(reg/v:DI 137 [ vl ])
(const_int 2 [0x2]) repeated x2
(const_int 0 [0])
(const_int 7 [0x7])
(reg:SI 66 vl)
(reg:SI 67 vtype)
(reg:SI 69 frm)
] UNSPEC_VPREDICATE)
(minus:RVVMF2SF (reg/v:RVVMF2SF 135 [ vs2 ])
(float_extend:RVVMF2SF (vec_duplicate:RVVMF4HF (reg/v:HF 136 [
rs1 ]))))
(unspec:RVVMF2SF [
(reg:DI 0 zero)
] UNSPEC_VUNDEF))) "<source>":5:10 -1
(nil))
FP16 vector need zvfh, so such intrinsic should be reported as illegal
intrinsic in frontend instead of an ICE.
with -rv64gcv_zvfh:
It can be compiled:
vsetvli zero,a0,e16,mf4,ta,ma
vfwsub.wf v8,v8,fa0
ret
