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ir3: Add is_reg_special()

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Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11469>
This commit is contained in:
Connor Abbott
2021-06-23 17:51:28 +02:00
committed by Marge Bot
parent dce680737d
commit 2522f387a3
2 changed files with 12 additions and 1 deletions
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11
src/freedreno/ir3/ir3.h
View File

@@ -1006,6 +1006,17 @@ static inline bool writes_pred(struct ir3_instruction *instr)
return false;
}
/* Is it something other than a normal register. Shared regs, p0, and a0/a1
* are considered special here. Special registers are always accessed with one
* size and never alias normal registers, even though a naive calculation
* would sometimes make it seem like e.g. r30.z aliases a0.x.
*/
static inline bool is_reg_special(const struct ir3_register *reg)
{
return (reg->flags & IR3_REG_SHARED) ||
(reg_num(reg) == REG_A0) || (reg_num(reg) == REG_P0);
}
/* returns defining instruction for reg */
/* TODO better name */
static inline struct ir3_instruction *ssa(struct ir3_register *reg)

2
src/freedreno/ir3/ir3_postsched.c
View File

@@ -422,7 +422,7 @@ add_reg_dep(struct ir3_postsched_deps_state *state,
* half-registers don't alias random full registers by pretending that
* they're full registers:
*/
if ((reg->flags & IR3_REG_HALF) && num < regid(48, 0)) {
if ((reg->flags & IR3_REG_HALF) && !is_reg_special(reg)) {
/* single conflict in half-reg space: */
add_single_reg_dep(state, node, num, src_n);
} else {