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nv50/ir: fold fma/mad when all 3 args are immediates

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This happens pretty rarely, but might as well do it when it does.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
This commit is contained in:
Ilia Mirkin 2015-12-02 21:02:12 -05:00
parent 2b98914fe0
commit a3722b81f5
1 changed files with 30 additions and 0 deletions
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30
src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
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@ -670,6 +670,34 @@ ConstantFolding::expr(Instruction *i,
res.data.u32 = ((a->data.u32 << offset) & bitmask) | (c->data.u32 & ~bitmask);
break;
}
case OP_MAD:
case OP_FMA: {
switch (i->dType) {
case TYPE_F32:
res.data.f32 = a->data.f32 * b->data.f32 * exp2f(i->postFactor) +
c->data.f32;
break;
case TYPE_F64:
res.data.f64 = a->data.f64 * b->data.f64 + c->data.f64;
break;
case TYPE_S32:
if (i->subOp == NV50_IR_SUBOP_MUL_HIGH) {
res.data.s32 = ((int64_t)a->data.s32 * b->data.s32 >> 32) + c->data.s32;
break;
}
/* fallthrough */
case TYPE_U32:
if (i->subOp == NV50_IR_SUBOP_MUL_HIGH) {
res.data.u32 = ((uint64_t)a->data.u32 * b->data.u32 >> 32) + c->data.u32;
break;
}
res.data.u32 = a->data.u32 * b->data.u32 + c->data.u32;
break;
default:
return;
}
break;
}
default:
return;
}
@ -684,6 +712,8 @@ ConstantFolding::expr(Instruction *i,
i->setSrc(2, NULL);
i->getSrc(0)->reg.data = res.data;
i->getSrc(0)->reg.type = i->dType;
i->getSrc(0)->reg.size = typeSizeof(i->dType);
i->op = OP_MOV;
}