Module: Mesa Branch: master Commit: 10b1f266872bd03881b7bd0c7894f0ebf020db42 URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=10b1f266872bd03881b7bd0c7894f0ebf020db42
Author: Alyssa Rosenzweig <[email protected]> Date: Fri Jan 15 15:46:39 2021 -0500 pan/bi: Lower frsq to Newton-Raphson Signed-off-by: Alyssa Rosenzweig <[email protected]> Acked-by: Boris Brezillon <[email protected]> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8894> --- src/panfrost/bifrost/bifrost_compile.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/src/panfrost/bifrost/bifrost_compile.c b/src/panfrost/bifrost/bifrost_compile.c index f73c74b9467..7ea1b5f877e 100644 --- a/src/panfrost/bifrost/bifrost_compile.c +++ b/src/panfrost/bifrost/bifrost_compile.c @@ -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) { _______________________________________________ mesa-commit mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/mesa-commit
