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pan/cs: Add helpers to emit match (AKA switch-case) blocks

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We need for the dynamic scoreboard assignment we will do in panvk.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Rebecca Mckeever <rebecca.mckeever@collabora.com>
Reviewed-by: Mary Guillemard <mary.guillemard@collabora.com>
Reviewed-by: Lars-Ivar Hesselberg Simonsen <lars-ivar.simonsen@arm.com>
Reviewed-by: John Anthony <john.anthony@arm.com>
Acked-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30969>
This commit is contained in:
Boris Brezillon 2024-08-30 17:19:46 +02:00 • committed by Marge Bot
parent 8f825a51a8
commit 1a5ce4a96e
2 changed files with 92 additions and 1 deletions
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7
src/panfrost/.clang-format
View file

@ -6,4 +6,9 @@ AlignConsecutiveBitFields: true
ColumnLimit: 80
BreakStringLiterals: false
SpaceBeforeParens: ControlStatementsExceptControlMacros
ForEachMacros: ['cs_while']
ForEachMacros: [
'cs_case',
'cs_default',
'cs_match',
'cs_while',
]

86
src/panfrost/lib/genxml/cs_builder.h
View file

@ -1216,3 +1216,89 @@ cs_trace_point(struct cs_builder *b, struct cs_index regs,
cs_apply_async(I, async);
}
}
struct cs_match {
struct cs_block block;
struct cs_label break_label;
struct cs_label next_case_label;
struct cs_index val;
struct cs_index scratch_reg;
bool default_emitted;
};
static inline struct cs_match *
cs_match_start(struct cs_builder *b, struct cs_match *match,
struct cs_index val, struct cs_index scratch_reg)
{
*match = (struct cs_match){
.val = val,
.scratch_reg = scratch_reg,
};
cs_block_start(b, &match->block);
cs_label_init(&match->break_label);
cs_label_init(&match->next_case_label);
return match;
}
static inline void
cs_match_case(struct cs_builder *b, struct cs_match *match, uint32_t id)
{
assert(b->blocks.cur && b->blocks.cur == &match->block);
assert(!match->default_emitted || !"default case must be last");
if (match->next_case_label.last_forward_ref != CS_LABEL_INVALID_POS) {
cs_branch_label(b, &match->break_label, MALI_CS_CONDITION_ALWAYS,
cs_undef());
cs_set_label(b, &match->next_case_label);
cs_label_init(&match->next_case_label);
}
if (id)
cs_add32(b, match->scratch_reg, match->val, -id);
cs_branch_label(b, &match->next_case_label, MALI_CS_CONDITION_NEQUAL,
id ? match->scratch_reg : match->val);
}
static inline void
cs_match_default(struct cs_builder *b, struct cs_match *match)
{
assert(b->blocks.cur && b->blocks.cur == &match->block);
assert(match->next_case_label.last_forward_ref != CS_LABEL_INVALID_POS ||
!"default case requires at least one other case");
cs_branch_label(b, &match->break_label, MALI_CS_CONDITION_ALWAYS,
cs_undef());
cs_set_label(b, &match->next_case_label);
cs_label_init(&match->next_case_label);
match->default_emitted = true;
}
static inline void
cs_match_end(struct cs_builder *b, struct cs_match *match)
{
assert(b->blocks.cur && b->blocks.cur == &match->block);
cs_set_label(b, &match->next_case_label);
cs_set_label(b, &match->break_label);
cs_block_end(b);
}
#define cs_match(__b, __val, __scratch) \
for (struct cs_match __match_storage, \
*__match = cs_match_start(__b, &__match_storage, __val, __scratch); \
__match != NULL; cs_match_end(__b, &__match_storage), __match = NULL)
#define cs_case(__b, __ref) \
for (bool __case_defined = ({ \
cs_match_case(__b, __match, __ref); \
false; \
}); \
!__case_defined; __case_defined = true)
#define cs_default(__b) \
for (bool __default_defined = ({ \
cs_match_default(__b, __match); \
false; \
}); \
!__default_defined; __default_defined = true)