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ptn: Emit mul+add for MAD

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Unlike fma() in GLSL, MAD in ARB programs is 100% splittable.  Just emit
the split version and let the optimizer fuse them later.

Shader-db results on Haswell:

   total instructions in shared programs: 7560379 -> 7560300 (-0.00%)
   instructions in affected programs: 143928 -> 143849 (-0.05%)
   helped: 443
   HURT: 250

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Jason Ekstrand 2016-05-05 17:14:39 -07:00
parent 1b72c31e1f
commit 47f01e538a
1 changed files with 5 additions and 1 deletions
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6
src/mesa/program/prog_to_nir.c
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@ -666,7 +666,7 @@ static const nir_op op_trans[MAX_OPCODE] = {
[OPCODE_LIT] = 0,
[OPCODE_LOG] = 0,
[OPCODE_LRP] = 0,
[OPCODE_MAD] = nir_op_ffma,
[OPCODE_MAD] = 0,
[OPCODE_MAX] = nir_op_fmax,
[OPCODE_MIN] = nir_op_fmin,
[OPCODE_MOV] = nir_op_fmov,
@ -757,6 +757,10 @@ ptn_emit_instruction(struct ptn_compile *c, struct prog_instruction *prog_inst)
ptn_lrp(b, dest, src);
break;
case OPCODE_MAD:
ptn_move_dest(b, dest, nir_fadd(b, nir_fmul(b, src[0], src[1]), src[2]));
break;
case OPCODE_DST:
ptn_dst(b, dest, src);
break;