fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2026-01-03 22:20:09 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

pan/bi: Lower frsq to Newton-Raphson

Browse source 
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Acked-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8894>
This commit is contained in:
Alyssa Rosenzweig 2021-01-15 15:46:39 -05:00 • committed by Marge Bot
parent c5e5d11599
commit 10b1f26687
1 changed files with 13 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

13
src/panfrost/bifrost/bifrost_compile.c
View file

@ -989,6 +989,19 @@ bi_lower_frcp_32(bi_builder *b, bi_index dst, bi_index s0)
BI_ROUND_NONE, BI_SPECIAL_NONE);
}
static void
bi_lower_frsq_32(bi_builder *b, bi_index dst, bi_index s0)
{
bi_index x1 = bi_frsq_approx_f32(b, s0);
bi_index m = bi_frexpm_f32(b, s0, false, true);
bi_index e = bi_frexpe_f32(b, bi_neg(s0), false, true);
bi_index t1 = bi_fmul_f32(b, x1, x1);
bi_index t2 = bi_fma_rscale_f32(b, m, bi_neg(t1), bi_imm_f32(1.0),
bi_imm_u32(-1), BI_ROUND_NONE, BI_SPECIAL_N);
bi_fma_rscale_f32_to(b, dst, t2, x1, x1, e,
BI_ROUND_NONE, BI_SPECIAL_N);
}
static void
bi_emit_alu(bi_builder *b, nir_alu_instr *instr)
{