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[RVV] Update ARGBAttenuateRow_RVV implementation

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Bug: libyuv:956
Change-Id: Ib539c2196767e88fa6e419ed2f22d95b6deaf406
Signed-off-by: Bruce Lai <bruce.lai@sifive.com>
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/4623172
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
Commit-Queue: Frank Barchard <fbarchard@chromium.org>
This commit is contained in:
Bruce Lai 2023-06-16 19:09:17 -07:00 committed by libyuv LUCI CQ
parent 7939e039e7
commit 4472b5b849
1 changed files with 12 additions and 5 deletions
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17
source/row_rvv.cc
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@ -924,24 +924,31 @@ void RAWToYRow_RVV(const uint8_t* src_raw, uint8_t* dst_y, int width) {
RGBToYMatrixRow_RVV(src_raw, dst_y, width, &kRawI601Constants);
}
// Attenuate: (f * a + 255) >> 8
void ARGBAttenuateRow_RVV(const uint8_t* src_argb,
uint8_t* dst_argb,
int width) {
size_t w = (size_t)width;
// To match behavior on other platforms, vxrm (fixed-point rounding mode
// register) is set to round-to-nearest-up(0).
asm volatile("csrwi vxrm, 0");
// register) is set to round-down(2).
asm volatile("csrwi vxrm, 2");
do {
vuint8m2_t v_b, v_g, v_r, v_a;
vuint16m4_t v_ba_16, v_ga_16, v_ra_16;
size_t vl = __riscv_vsetvl_e8m2(w);
__riscv_vlseg4e8_v_u8m2(&v_b, &v_g, &v_r, &v_a, src_argb, vl);
// f * a
v_ba_16 = __riscv_vwmulu_vv_u16m4(v_b, v_a, vl);
v_ga_16 = __riscv_vwmulu_vv_u16m4(v_g, v_a, vl);
v_ra_16 = __riscv_vwmulu_vv_u16m4(v_r, v_a, vl);
v_b = __riscv_vnclipu_wx_u8m2(v_ba_16, 8, vl);
v_g = __riscv_vnclipu_wx_u8m2(v_ga_16, 8, vl);
v_r = __riscv_vnclipu_wx_u8m2(v_ra_16, 8, vl);
// f * a + 255
v_ba_16 = __riscv_vadd_vx_u16m4(v_ba_16, 255u, vl);
v_ga_16 = __riscv_vadd_vx_u16m4(v_ga_16, 255u, vl);
v_ra_16 = __riscv_vadd_vx_u16m4(v_ra_16, 255u, vl);
// (f * a + 255) >> 8
v_b = __riscv_vnsrl_wx_u8m2(v_ba_16, 8, vl);
v_g = __riscv_vnsrl_wx_u8m2(v_ga_16, 8, vl);
v_r = __riscv_vnsrl_wx_u8m2(v_ra_16, 8, vl);
__riscv_vsseg4e8_v_u8m2(dst_argb, v_b, v_g, v_r, v_a, vl);
w -= vl;
src_argb += vl * 4;