diff options
Diffstat (limited to 'src/devices/cpu/rsp/vmull.h')
-rw-r--r-- | src/devices/cpu/rsp/vmull.h | 44 |
1 files changed, 0 insertions, 44 deletions
diff --git a/src/devices/cpu/rsp/vmull.h b/src/devices/cpu/rsp/vmull.h deleted file mode 100644 index e54399b01da..00000000000 --- a/src/devices/cpu/rsp/vmull.h +++ /dev/null @@ -1,44 +0,0 @@ -// license:BSD-3-Clause -// copyright-holders:Tyler J. Stachecki,Ryan Holtz - -inline rsp_vec_t vec_vmadl_vmudl(uint32_t iw, rsp_vec_t vs, rsp_vec_t vt, rsp_vec_t zero, rsp_vec_t *acc_lo, rsp_vec_t *acc_md, rsp_vec_t *acc_hi) -{ - rsp_vec_t hi = _mm_mulhi_epu16(vs, vt); - - if (iw & 0x8) // VMADL - { - // Tricky part: start accumulating everything. - // Get/keep the carry as we'll add it in later. - rsp_vec_t overflow_mask = _mm_adds_epu16(*acc_lo, hi); - *acc_lo = _mm_add_epi16(*acc_lo, hi); - - overflow_mask = _mm_cmpeq_epi16(*acc_lo, overflow_mask); - overflow_mask = _mm_cmpeq_epi16(overflow_mask, zero); - hi = _mm_sub_epi16(zero, overflow_mask); - - // Check for overflow of the upper sum. - // - // TODO: Since hi can only be {0,1}, we should - // be able to generalize this for performance. - overflow_mask = _mm_adds_epu16(*acc_md, hi); - *acc_md = _mm_add_epi16(*acc_md, hi); - - overflow_mask = _mm_cmpeq_epi16(*acc_md, overflow_mask); - overflow_mask = _mm_cmpeq_epi16(overflow_mask, zero); - - // Finish up the accumulation of the... accumulator. - // Since the product was unsigned, only worry about - // positive overflow (i.e.: borrowing not possible). - *acc_hi = _mm_sub_epi16(*acc_hi, overflow_mask); - - return uclamp_acc(*acc_lo, *acc_md, *acc_hi, zero); - } - else // VMUDL - { - *acc_lo = hi; - *acc_md = zero; - *acc_hi = zero; - - return hi; - } -} |