https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115068
Bug ID: 115068
Summary: RISC-V: Illegal instruction of vfwadd
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: ---
#include <stdint.h>
#include <riscv_vector.h>
vfloat64m8_t test_vfwadd_wf_f64m8_m(vbool8_t vm, vfloat64m8_t vs2, float rs1,
size_t vl) {
return __riscv_vfwadd_wf_f64m8_m(vm, vs2, rs1, vl);
}
char global_memory[1024];
void *fake_memory = (void *)global_memory;
int main ()
{
asm volatile("fence":::"memory");
vfloat64m8_t vfwadd_wf_f64m8_m_vd =
test_vfwadd_wf_f64m8_m(__riscv_vreinterpret_v_i8m1_b8(__riscv_vundefined_i8m1()),
__riscv_vundefined_f64m8(), 1.0, __riscv_vsetvlmax_e64m8());
asm volatile(""::"vr"(vfwadd_wf_f64m8_m_vd):"memory");
return 0;
}
https://compiler-explorer.com/z/rq7K33zE5
main:
fence
lui a5,%hi(.LC0)
flw fa5,%lo(.LC0)(a5)
vsetvli a5,zero,e32,m4,ta,ma
vfwadd.wf v0,v8,fa5,v0.t ---> vd should not be v0.
li a0,0
ret
