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pan/bi: Lower FEXP2 with a table 

Connor's code, not the blob's, amusingly.

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 16:02:46 -05:00 committed by Marge Bot
parent 10b1f26687
commit d4c028f770
1 changed files with 34 additions and 0 deletions
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34
src/panfrost/bifrost/bifrost_compile.c
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@ -1002,6 +1002,40 @@ bi_lower_frsq_32(bi_builder *b, bi_index dst, bi_index s0)
BI_ROUND_NONE, BI_SPECIAL_N);
}
/* More complex transcendentals, see
* https://gitlab.freedesktop.org/panfrost/mali-isa-docs/-/blob/master/Bifrost.adoc
* for documentation */
static void
bi_lower_fexp2_32(bi_builder *b, bi_index dst, bi_index s0)
{
bi_index t1 = bi_temp(b->shader);
bi_instr *t1_instr = bi_fadd_f32_to(b, t1,
s0, bi_imm_u32(0x49400000), BI_ROUND_NONE);
t1_instr->clamp = BI_CLAMP_CLAMP_0_INF;
bi_index t2 = bi_fadd_f32(b, t1, bi_imm_u32(0xc9400000), BI_ROUND_NONE);
bi_instr *a2 = bi_fadd_f32_to(b, bi_temp(b->shader),
s0, bi_neg(t2), BI_ROUND_NONE);
a2->clamp = BI_CLAMP_CLAMP_M1_1;
bi_index a1t = bi_fexp_table_u4(b, t1, BI_ADJ_NONE);
bi_index t3 = bi_isub_u32(b, t1, bi_imm_u32(0x49400000), false);
bi_index a1i = bi_arshift_i32(b, t3, bi_null(), bi_imm_u8(4));
bi_index p1 = bi_fma_f32(b, a2->dest[0], bi_imm_u32(0x3d635635),
bi_imm_u32(0x3e75fffa), BI_ROUND_NONE);
bi_index p2 = bi_fma_f32(b, p1, a2->dest[0],
bi_imm_u32(0x3f317218), BI_ROUND_NONE);
bi_index p3 = bi_fmul_f32(b, a2->dest[0], p2);
bi_instr *x = bi_fma_rscale_f32_to(b, bi_temp(b->shader),
p3, a1t, a1t, a1i, BI_ROUND_NONE, BI_SPECIAL_NONE);
x->clamp = BI_CLAMP_CLAMP_0_INF;
bi_instr *max = bi_fmax_f32_to(b, dst, x->dest[0], s0);
max->sem = BI_SEM_NAN_PROPAGATE;
}
static void
bi_emit_alu(bi_builder *b, nir_alu_instr *instr)
{