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nir: Add a nir_instr_move helper

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Removes an instruction from one place and inserts it at another while
working around a weird cursor corner-case.

v2: change return value to bool (Daniel Schürmann)

Reviewed-by: Timur Kristóf <timur.kristof@gmail.com> (v1)
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10522>
This commit is contained in:
Jason Ekstrand 2018-07-04 09:10:28 -07:00 • committed by Marge Bot
parent 3701cb9439
commit f97fb1fa55
2 changed files with 18 additions and 0 deletions
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16
src/compiler/nir/nir.c
View file

@ -958,6 +958,22 @@ nir_instr_insert(nir_cursor cursor, nir_instr *instr)
impl->valid_metadata &= ~nir_metadata_instr_index;
}
bool
nir_instr_move(nir_cursor cursor, nir_instr *instr)
{
/* If the cursor happens to refer to this instruction (either before or
* after), don't do anything.
*/
if ((cursor.option == nir_cursor_before_instr ||
cursor.option == nir_cursor_after_instr) &&
cursor.instr == instr)
return false;
nir_instr_remove(instr);
nir_instr_insert(cursor, instr);
return true;
}
static bool
src_is_valid(const nir_src *src)
{

2
src/compiler/nir/nir.h
View file

@ -3826,6 +3826,8 @@ nir_after_cf_list(struct exec_list *cf_list)
*/
void nir_instr_insert(nir_cursor cursor, nir_instr *instr);
bool nir_instr_move(nir_cursor cursor, nir_instr *instr);
static inline void
nir_instr_insert_before(nir_instr *instr, nir_instr *before)
{