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freedreno/ir3: fold const conversion into consumer

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A sequence like:

  (nop3)cov.f32f16 hr0.x, c0.x
  mul.f hr4.y, hr1.z, hr0.x

can be turned into:

  mul.f hr4.y, hr1.z, hc0.x

Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3737>
This commit is contained in:
Rob Clark
2019-06-20 16:31:00 +00:00
committed by Kristian H. Kristensen
parent 5e2012d5c7
commit 3eca6d9ce1
2 changed files with 20 additions and 1 deletions
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src/freedreno/ir3/ir3.h
+19
View File
@@ -695,6 +695,25 @@ static inline bool is_same_type_mov(struct ir3_instruction *instr)
return true;
}
/* A move from const, which changes size but not type, can also be
* folded into dest instruction in some cases.
*/
static inline bool is_const_mov(struct ir3_instruction *instr)
{
if (instr->opc != OPC_MOV)
return false;
if (!(instr->regs[1]->flags & IR3_REG_CONST))
return false;
type_t src_type = instr->cat1.src_type;
type_t dst_type = instr->cat1.dst_type;
return (type_float(src_type) && type_float(dst_type)) ||
(type_uint(src_type) && type_uint(dst_type)) ||
(type_sint(src_type) && type_sint(dst_type));
}
static inline bool is_alu(struct ir3_instruction *instr)
{
return (1 <= opc_cat(instr->opc)) && (opc_cat(instr->opc) <= 3);
src/freedreno/ir3/ir3_cp.c
+1 -1
View File
@@ -463,7 +463,7 @@ reg_cp(struct ir3_cp_ctx *ctx, struct ir3_instruction *instr,
return true;
}
} else if (is_same_type_mov(src) &&
} else if ((is_same_type_mov(src) || is_const_mov(src)) &&
/* cannot collapse const/immed/etc into meta instrs: */
!is_meta(instr)) {
/* immed/const/etc cases, which require some special handling: */