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nir: Skip common instructions when comparing deref paths

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Deref paths may share the same deref instructions in their chains,
e.g.

    ssa_100 = deref_var A
    ssa_101 = deref_struct "array_field" of ssa_100
    ssa_102 = deref_array "[1]" of ssa_101
    ssa_103 = deref_struct "field_a" of ssa_102
    ssa_104 = deref_struct "field_a" of ssa_103

when comparing the two last deref instructions, their paths will share
a common sequence ssa_100, ssa_101, ssa_102.  This patch skips to next
iteration if the deref instructions are the same.  Path[0] (the var)
is still handled specially, so in the case above, only ssa_101 and
ssa_102 will be skipped.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Caio Marcelo de Oliveira Filho 2018-08-10 16:04:04 -07:00
parent 5196041e93
commit 8364ec3fce
1 changed files with 3 additions and 0 deletions
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3
src/compiler/nir/nir_deref.c
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@ -294,6 +294,9 @@ nir_compare_deref_paths(nir_deref_path *a_path,
nir_deref_instr *a_tail = *(a_p++);
nir_deref_instr *b_tail = *(b_p++);
if (a_tail == b_tail)
continue;
switch (a_tail->deref_type) {
case nir_deref_type_array:
case nir_deref_type_array_wildcard: {