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mandelbrot.S
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#if 0
void
mandelbrot_rvv(size_t width, size_t maxIter, uint32_t *res)
{
size_t VL2 = __riscv_vsetvlmax_e32m2();
vfloat32m2_t v4 = __riscv_vfmv_v_f_f32m2(4, VL2);
vuint32m2_t vid = __riscv_vid_v_u32m2(VL2);
vfloat32m2_t cx, cy, zx, zy, zx2, zy2;
for (size_t y = 0; y < width; ++y) {
cy = __riscv_vfmv_v_f_f32m2(y, VL2);
cy = __riscv_vfadd(__riscv_vfmul(cy, 2.0f / width, VL2), -1, VL2);
for (size_t vl, x = 0, n = width; n > 0; n -= vl, res += vl, x += vl) {
vl = __riscv_vsetvl_e32m2(n);
cx = __riscv_vfcvt_f(__riscv_vadd(vid, x, vl), vl);
cx = __riscv_vfadd(__riscv_vfmul(cx, 2.0f / width, vl), -1.5f, vl);
size_t iter = 0;
vuint32m2_t viter = __riscv_vmv_v_x_u32m2(0, vl);
vbool16_t mask = __riscv_vmset_m_b16(vl);
zx = zy = zx2 = zy2 = __riscv_vfmv_v_f_f32m2(0, vl);
do {
mask = __riscv_vmflt(__riscv_vfadd(zx2, zy2, vl), v4, vl);
viter = __riscv_vadc(viter, 0, mask, vl);
zy = __riscv_vfmacc(cy, __riscv_vfadd(zx, zx, vl), zy, vl);
zx = __riscv_vfadd(__riscv_vfsub(zx2, zy2, vl), cx, vl);
zx2 = __riscv_vfmul(zx, zx, vl);
zy2 = __riscv_vfmul(zy, zy, vl);
++iter;
} while (iter < maxIter && __riscv_vfirst(mask, vl) >= 0);
__riscv_vse32(res, viter, vl);
}
}
}
#endif
#if MX_N > 0 && MX_N <= 2
#if IF_VF16(1)+0
.global MX(mandelbrot_rvv_f16_) # generated by clang
.balign 2
MX(rvv_f16_m1p5):
.half 0xbe00 # half -1.5
MX(rvv_f16_m1):
.half 0xbc00 # half -1
MX(rvv_f16_p4):
.half 0x4400 # half 4
MX(mandelbrot_rvv_f16_):
beqz a0, 9f
li a6, 0
vsetvli a3, zero, e16, MX(), ta, ma
fcvt.s.wu fa5, a0
la a3, MX(rvv_f16_p4)
flh fa4, (a3)
lui a3, 262144
fmv.w.x fa3, a3
fdiv.s fa3, fa3, fa5
la a3, MX(rvv_f16_m1)
flh fa5, (a3)
vfmv.v.f v8, fa4
la a3, MX(rvv_f16_m1p5)
flh fa4, (a3)
addi a3, a1, -1
sltu a1, a1, a3
addi a1, a1, -1
and a1, a1, a3
vsetvli zero, zero, e32, MX2(), ta, ma
vid.v v12
fcvt.h.s fa3, fa3
addi a7, a1, 1
j 2f
1:
addi a6, a6, 1
beq a6, a0, 9f
2:
li a4, 0
fcvt.h.wu fa2, a6
vsetvli a1, zero, e16, MX(), ta, ma
vfmv.v.f v10, fa2
vfmul.vf v10, v10, fa3
vfadd.vf v10, v10, fa5
mv a5, a0
j 4f
3:
vsetvli zero, zero, e32, MX2(), ta, ma
vse32.v v16, (a2)
sub a5, a5, t0
slli a1, t0, 2
add a2, a2, a1
add a4, a4, t0
beqz a5, 1b
4:
vsetvli t0, a5, e32, MX2(), ta, ma
vadd.vx v16, v12, a4
vsetvli zero, zero, e16, MX(), ta, ma
vmv.v.i v22, 0
vfncvt.f.xu.w v20, v16
vfmul.vf v16, v20, fa3
vfadd.vf v20, v16, fa4
vsetvli zero, zero, e32, MX2(), ta, ma
vmv.v.i v16, 0
mv a1, a7
vmv2r.v v26, v22
vmv2r.v v24, v22
vmv2r.v v28, v22
5:
vsetvli zero, zero, e16, MX(), ta, ma
vfadd.vv v30, v26, v22
vmflt.vv v0, v30, v8
addi a1, a1, -1
vsetvli zero, zero, e32, MX2(), ta, ma
vadc.vim v16, v16, 0, v0
beqz a1, 3b
vsetvli zero, zero, e16, MX(), ta, ma
vfadd.vv v28, v28, v28
vfsub.vv v22, v26, v22
vfmadd.vv v24, v28, v10
vfadd.vv v28, v22, v20
vfmul.vv v22, v24, v24
vfirst.m a3, v0
vfmul.vv v26, v28, v28
bgez a3, 5b
j 3b
9:
ret
#endif
.global MX(mandelbrot_rvv_f32_) # generated by clang
MX(mandelbrot_rvv_f32_):
beqz a0, 9f
li a6, 0
vsetvli a3, zero, e32, MX(), ta, ma
lui a3, 264192
fcvt.s.wu fa4, a0
vmv.v.x v8, a3
lui a3, 262144
fmv.w.x fa3, a3
lui a3, 784384
fmv.w.x fa5, a3
lui a3, 785408
fdiv.s fa4, fa3, fa4
fmv.w.x fa3, a3
addi a3, a1, -1
sltu a1, a1, a3
addi a1, a1, -1
and a1, a1, a3
vid.v v10
addi a7, a1, 1
j 2f
1:
addi a6, a6, 1
beq a6, a0, 9f
2:
li a4, 0
fcvt.s.wu fa2, a6
vsetvli a1, zero, e32, MX(), ta, ma
vfmv.v.f v12, fa2
vfmul.vf v12, v12, fa4
vfadd.vf v12, v12, fa5
mv a5, a0
j 4f
3:
vse32.v v14, (a2)
sub a5, a5, t0
slli a1, t0, 2
add a2, a2, a1
add a4, a4, t0
beqz a5, 1b
4:
vsetvli t0, a5, e32, MX(), ta, ma
vadd.vx v14, v10, a4
vmv.v.i v18, 0
vfcvt.f.xu.v v14, v14
vfmul.vf v14, v14, fa4
vfadd.vf v16, v14, fa3
vmv.v.i v14, 0
mv a1, a7
vmv.v.i v22, 0
vmv.v.i v20, 0
vmv.v.i v24, 0
5:
vfadd.vv v26, v22, v18
vmflt.vv v0, v26, v8
addi a1, a1, -1
vadc.vim v14, v14, 0, v0
beqz a1, 3b
vfadd.vv v24, v24, v24
vfsub.vv v18, v22, v18
vfmadd.vv v20, v24, v12
vfadd.vv v24, v18, v16
vfmul.vv v18, v20, v20
vfirst.m a3, v0
vfmul.vv v22, v24, v24
bgez a3, 5b
j 3b
9:
ret
#if IF_VF64(1)+0
.balign 8
.global MX(mandelbrot_rvv_f64_) # generated by clang
MX(rvv_f64_m1p5):
.quad 0xbff8000000000000 # double -1.5
MX(rvv_f64_m1):
.quad 0xbff0000000000000 # double -1
MX(rvv_f64_p4):
.quad 0x4010000000000000 # double 4
MX(mandelbrot_rvv_f64_):
beqz a0, 9f
li a6, 0
vsetvli a3, zero, e64, MX(), ta, ma
fcvt.s.wu fa5, a0
la a3, MX(rvv_f64_p4)
fld fa4, (a3)
lui a3, 262144
fmv.w.x fa3, a3
fdiv.s fa3, fa3, fa5
la a3, MX(rvv_f64_m1)
fld fa5, (a3)
vfmv.v.f v8, fa4
la a3, MX(rvv_f64_m1p5)
fld fa4, (a3)
addi a3, a1, -1
sltu a1, a1, a3
addi a1, a1, -1
and a1, a1, a3
vid.v v10
fcvt.d.s fa3, fa3
addi a7, a1, 1
j 2f
1:
addi a6, a6, 1
beq a6, a0, 9f
2:
li a4, 0
fcvt.d.lu fa2, a6
vsetvli a1, zero, e64, MX(), ta, ma
vfmv.v.f v12, fa2
vfmul.vf v12, v12, fa3
vfadd.vf v12, v12, fa5
mv a5, a0
j 4f
3:
#if HAS_RVV_1_0 || MX_N >= 2
vsetvli zero, zero, e32, MXf2(), ta, ma
#else
vsetvli zero, zero, e32, m1, ta, ma
#endif
vse32.v v14, (a2)
sub a5, a5, t0
slli a1, t0, 2
add a2, a2, a1
add a4, a4, t0
beqz a5, 1b
4:
vsetvli t0, a5, e64, MX(), ta, ma
vadd.vx v14, v10, a4
vmv.v.i v18, 0
vfcvt.f.xu.v v14, v14
vfmul.vf v14, v14, fa3
vfadd.vf v16, v14, fa4
#if HAS_RVV_1_0 || MX_N >= 2
vsetvli zero, zero, e32, MXf2(), ta, ma
#else
vsetvli zero, zero, e32, m1, ta, ma
#endif
vmv.v.i v14, 0
mv a1, a7
vmv2r.v v22, v18
vmv2r.v v20, v18
vmv2r.v v24, v18
5:
vsetvli zero, zero, e64, MX(), ta, ma
vfadd.vv v26, v22, v18
vmflt.vv v0, v26, v8
addi a1, a1, -1
#if HAS_RVV_1_0 || MX_N >= 2
vsetvli zero, zero, e32, MXf2(), ta, ma
#else
vsetvli zero, zero, e32, m1, ta, ma
#endif
vadc.vim v14, v14, 0, v0
beqz a1, 3b
vsetvli zero, zero, e64, MX(), ta, ma
vfadd.vv v24, v24, v24
vfsub.vv v18, v22, v18
vfmadd.vv v20, v24, v12
vfadd.vv v24, v18, v16
vfmul.vv v18, v20, v20
vfirst.m a3, v0
vfmul.vv v22, v24, v24
bgez a3, 5b
j 3b
9:
ret
#endif
#endif