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agx: Ensure we don't overallocate registers

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Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11751>
This commit is contained in:
Alyssa Rosenzweig
2021-07-06 22:11:31 -04:00
committed by Marge Bot
parent 7e65e47d19
commit 1d0008734c
3 changed files with 9 additions and 5 deletions
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1
src/asahi/compiler/agx_compile.c
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@@ -1366,6 +1366,7 @@ agx_compile_shader_nir(nir_shader *nir,
ctx->nir_regalloc[reg->index] = nir_regalloc;
}
ctx->max_register = nir_regalloc;
ctx->alloc += func->impl->ssa_alloc;
emit_cf_list(ctx, &func->impl->body);
break; /* TODO: Multi-function shaders */

3
src/asahi/compiler/agx_compiler.h
View File

@@ -363,6 +363,9 @@ typedef struct {
* driver. YOLO the mapping of nir_register to fixed hardware registers */
unsigned *nir_regalloc;
/* We reserve the top (XXX: that hurts thread count) */
unsigned max_register;
/* Place to start pushing new values */
unsigned push_base;

10
src/asahi/compiler/agx_register_allocate.c
View File

@@ -73,9 +73,9 @@ agx_write_registers(agx_instr *I, unsigned d)
}
static unsigned
agx_assign_regs(BITSET_WORD *used_regs, unsigned count, unsigned align)
agx_assign_regs(BITSET_WORD *used_regs, unsigned count, unsigned align, unsigned max)
{
for (unsigned reg = 0; reg < AGX_NUM_REGS; reg += align) {
for (unsigned reg = 0; reg < max; reg += align) {
bool conflict = false;
for (unsigned j = 0; j < count; ++j)
@@ -95,7 +95,7 @@ agx_assign_regs(BITSET_WORD *used_regs, unsigned count, unsigned align)
/** Assign registers to SSA values in a block. */
static void
agx_ra_assign_local(agx_block *block, uint8_t *ssa_to_reg)
agx_ra_assign_local(agx_block *block, uint8_t *ssa_to_reg, unsigned max_reg)
{
BITSET_DECLARE(used_regs, AGX_NUM_REGS) = { 0 };
@@ -125,7 +125,7 @@ agx_ra_assign_local(agx_block *block, uint8_t *ssa_to_reg)
if (I->dest[d].type == AGX_INDEX_NORMAL) {
unsigned count = agx_write_registers(I, d);
unsigned align = (I->dest[d].size == AGX_SIZE_16) ? 1 : 2;
unsigned reg = agx_assign_regs(used_regs, count, align);
unsigned reg = agx_assign_regs(used_regs, count, align, max_reg);
ssa_to_reg[I->dest[d].value] = reg;
}
@@ -144,7 +144,7 @@ agx_ra(agx_context *ctx)
agx_compute_liveness(ctx);
uint8_t *ssa_to_reg = calloc(ctx->alloc, sizeof(uint8_t));
agx_foreach_block(ctx, block)
agx_ra_assign_local(block, ssa_to_reg);
agx_ra_assign_local(block, ssa_to_reg, ctx->max_register);
/* TODO: Coalesce combines */