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i965/nir: Add utility method for comparisons

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This method returns the brw_conditional_mod value used when emitting
comparative ALU operations.

It could be moved to brw_nir in the future to reuse it in fs_nir backend.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
This commit is contained in:
Antia Puentes 2015-04-17 17:58:35 +02:00 • committed by Jason Ekstrand
parent dae6025e8e
commit b9c41affcf
1 changed files with 39 additions and 0 deletions
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39
src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
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@ -652,6 +652,45 @@ brw_swizzle_for_nir_swizzle(uint8_t swizzle[4])
return BRW_SWIZZLE4(swizzle[0], swizzle[1], swizzle[2], swizzle[3]);
}
static enum brw_conditional_mod
brw_conditional_for_nir_comparison(nir_op op)
{
switch (op) {
case nir_op_flt:
case nir_op_ilt:
case nir_op_ult:
return BRW_CONDITIONAL_L;
case nir_op_fge:
case nir_op_ige:
case nir_op_uge:
return BRW_CONDITIONAL_GE;
case nir_op_feq:
case nir_op_ieq:
case nir_op_ball_fequal2:
case nir_op_ball_iequal2:
case nir_op_ball_fequal3:
case nir_op_ball_iequal3:
case nir_op_ball_fequal4:
case nir_op_ball_iequal4:
return BRW_CONDITIONAL_Z;
case nir_op_fne:
case nir_op_ine:
case nir_op_bany_fnequal2:
case nir_op_bany_inequal2:
case nir_op_bany_fnequal3:
case nir_op_bany_inequal3:
case nir_op_bany_fnequal4:
case nir_op_bany_inequal4:
return BRW_CONDITIONAL_NZ;
default:
unreachable("not reached: bad operation for comparison");
}
}
void
vec4_visitor::nir_emit_alu(nir_alu_instr *instr)
{