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pan/bi: Add special indices

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For fixed registers, uniforms, and constants, which bypass the usual SSA
mechanism to map well to the ISA.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4061>
This commit is contained in:
Alyssa Rosenzweig 2020-03-03 07:45:33 -05:00 • committed by Marge Bot
parent c42002d26f
commit a2c1265dd3
1 changed files with 19 additions and 0 deletions
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19
src/panfrost/bifrost/compiler.h
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@ -202,6 +202,25 @@ typedef struct {
#define BIR_NO_ARG (0)
#define BIR_IS_REG (1)
/* If high bits are set, instead of SSA/registers, we have specials indexed by
* the low bits if necessary.
*
* Fixed register: do not allocate register, do not collect $200.
* Uniform: access a uniform register given by low bits.
* Constant: access the specified constant
* Zero: special cased to avoid wasting a constant
*/
#define BIR_INDEX_REGISTER (1 << 31)
#define BIR_INDEX_UNIFORM (1 << 30)
#define BIR_INDEX_CONSTANT (1 << 29)
#define BIR_INDEX_ZERO (1 << 28)
/* Keep me synced please so we can check src & BIR_SPECIAL */
#define BIR_SPECIAL ((BIR_INDEX_REGISTER | BIR_INDEX_UNIFORM) | \
(BIR_INDEX_CONSTANT | BIR_INDEX_ZERO)
static inline unsigned
bir_ssa_index(nir_ssa_def *ssa)
{