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agx: Implement scalar load/store_preamble

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These need to copy values between GPRs and uniform registers. This is pretty
easy in either direction. This implements scalar versions of the intrinsics. A
backend NIR pass will scalarize for us.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18813>
This commit is contained in:
Alyssa Rosenzweig
2022-09-25 20:02:48 -04:00
parent 14fe5bc598
commit 056280a4a1
1 changed files with 24 additions and 0 deletions
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24
src/asahi/compiler/agx_compile.c
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@@ -584,6 +584,24 @@ agx_emit_load_ubo(agx_builder *b, agx_index dst, nir_intrinsic_instr *instr)
return NULL;
}
/* Preambles write directly to uniform registers, so move from uniform to GPR */
static agx_instr *
agx_emit_load_preamble(agx_builder *b, agx_index dst, nir_intrinsic_instr *instr)
{
assert(nir_dest_num_components(instr->dest) == 1 && "already scalarized");
return agx_mov_to(b, dst, agx_uniform(nir_intrinsic_base(instr), dst.size));
}
static agx_instr *
agx_emit_store_preamble(agx_builder *b, nir_intrinsic_instr *instr)
{
assert(nir_src_num_components(instr->src[0]) == 1 && "already scalarized");
agx_index value = agx_src_index(&instr->src[0]);
agx_index offset = agx_immediate(nir_intrinsic_base(instr));
return agx_uniform_store(b, value, offset);
}
/*
* Emit code to generate gl_FragCoord. The xy components are calculated from
* special registers, whereas the zw components are interpolated varyings.
@@ -712,6 +730,12 @@ agx_emit_intrinsic(agx_builder *b, nir_intrinsic_instr *instr)
case nir_intrinsic_load_instance_id:
return agx_mov_to(b, dst, agx_abs(agx_instance_id(b)));
case nir_intrinsic_load_preamble:
return agx_emit_load_preamble(b, dst, instr);
case nir_intrinsic_store_preamble:
return agx_emit_store_preamble(b, instr);
case nir_intrinsic_load_blend_const_color_r_float: return agx_blend_const(b, dst, 0);
case nir_intrinsic_load_blend_const_color_g_float: return agx_blend_const(b, dst, 1);
case nir_intrinsic_load_blend_const_color_b_float: return agx_blend_const(b, dst, 2);