Mesa (master): nir/from_ssa: Don't rewrite derefs destinations to registers
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Tue Oct 2 15:25:14 UTC 2018
Module: Mesa
Branch: master
Commit: 00f385e6d457d9b57f683ea52157e1620b96fa8c
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=00f385e6d457d9b57f683ea52157e1620b96fa8c
Author: Jason Ekstrand <jason.ekstrand at intel.com>
Date: Sat Sep 22 06:59:22 2018 -0500
nir/from_ssa: Don't rewrite derefs destinations to registers
We already call nir_rematerialize_derefs_in_use_blocks_impl prior to
calling nir_lower_ssa_defs_to_regs_block so the assertion that all deref
uses in the block should hold. This fixes the following CTS test when
SPIR-V optimization recipe 1:
dEQP-VK.glsl.struct.local.loop_nested_struct_array_vertex
Fixes: 606eb56ab9449b "intel/nir: Only lower load/store derefs"
Reviewed-by: Iago Toral Quiroga <itoral at igalia.com>
---
src/compiler/nir/nir_from_ssa.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/src/compiler/nir/nir_from_ssa.c b/src/compiler/nir/nir_from_ssa.c
index 19d4bc3382..08d480f119 100644
--- a/src/compiler/nir/nir_from_ssa.c
+++ b/src/compiler/nir/nir_from_ssa.c
@@ -976,6 +976,12 @@ nir_lower_ssa_defs_to_regs_block(nir_block *block)
mov->dest.dest = nir_dest_for_reg(reg);
mov->dest.write_mask = (1 << reg->num_components) - 1;
nir_instr_insert(nir_after_instr(&load->instr), &mov->instr);
+ } else if (instr->type == nir_instr_type_deref) {
+ /* Derefs should always be SSA values, don't rewrite them. */
+ nir_deref_instr *deref = nir_instr_as_deref(instr);
+ nir_foreach_use_safe(use, &deref->dest.ssa)
+ assert(use->parent_instr->block == block);
+ assert(list_empty(&deref->dest.ssa.if_uses));
} else {
nir_foreach_dest(instr, dest_replace_ssa_with_reg, &state);
}
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