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nir/lower_doubles: Handle fdiv and fsub directly

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Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Jason Ekstrand
2019-07-11 17:06:31 -05:00
parent d7d35a9522
commit 548da20b22
2 changed files with 17 additions and 2 deletions
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4
src/compiler/nir/nir.h
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@@ -2476,7 +2476,9 @@ typedef enum {
nir_lower_dfract = (1 << 6),
nir_lower_dround_even = (1 << 7),
nir_lower_dmod = (1 << 8),
nir_lower_fp64_full_software = (1 << 9),
nir_lower_dsub = (1 << 9),
nir_lower_ddiv = (1 << 10),
nir_lower_fp64_full_software = (1 << 11),
} nir_lower_doubles_options;
typedef struct nir_shader_compiler_options {

15
src/compiler/nir/nir_lower_double_ops.c
View File

@@ -600,6 +600,8 @@ nir_lower_doubles_op_to_options_mask(nir_op opcode)
case nir_op_ffract: return nir_lower_dfract;
case nir_op_fround_even: return nir_lower_dround_even;
case nir_op_fmod: return nir_lower_dmod;
case nir_op_fsub: return nir_lower_dsub;
case nir_op_fdiv: return nir_lower_ddiv;
default: return 0;
}
}
@@ -673,10 +675,21 @@ lower_doubles_instr(nir_builder *b, nir_instr *instr, void *_data)
case nir_op_fround_even:
return lower_round_even(b, src);
case nir_op_fdiv:
case nir_op_fsub:
case nir_op_fmod: {
nir_ssa_def *src1 = nir_mov_alu(b, alu->src[1],
alu->dest.dest.ssa.num_components);
return lower_mod(b, src, src1);
switch (alu->op) {
case nir_op_fdiv:
return nir_fmul(b, src, nir_frcp(b, src1));
case nir_op_fsub:
return nir_fadd(b, src, nir_fneg(b, src1));
case nir_op_fmod:
return lower_mod(b, src, src1);
default:
unreachable("unhandled opcode");
}
}
default:
unreachable("unhandled opcode");