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agx: Handle ssa_undef as zero

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Masked stores may result in undefs after optimization. Rather than call
lower_undef_to_zero late (but get no benefit), we may as well handle ourselves
to prepare for proper undef support down the line.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21431>
This commit is contained in:
Alyssa Rosenzweig 2023-02-17 18:35:40 -05:00 • committed by Marge Bot
parent eab4d6a96f
commit 5e031867fe
1 changed files with 14 additions and 0 deletions
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14
src/asahi/compiler/agx_compile.c
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@ -1533,6 +1533,16 @@ agx_emit_phis_deferred(agx_context *ctx)
}
}
static void
agx_emit_undef(agx_builder *b, nir_ssa_undef_instr *instr)
{
/* For now, just lower undefs to zero. This doesn't matter too much, since
* the lowering happens in NIR and this just allows for late lowering passes
* to result in undefs.
*/
agx_mov_imm_to(b, agx_nir_ssa_index(&instr->def), 0);
}
static void
agx_emit_instr(agx_builder *b, struct nir_instr *instr)
{
@ -1561,6 +1571,10 @@ agx_emit_instr(agx_builder *b, struct nir_instr *instr)
agx_emit_phi(b, nir_instr_as_phi(instr));
break;
case nir_instr_type_ssa_undef:
agx_emit_undef(b, nir_instr_as_ssa_undef(instr));
break;
default:
unreachable("should've been lowered");
}