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nir/cf: add split_block_cursor()

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This is a helper that will be shared between the new control flow
insertion and modification code.

Signed-off-by: Connor Abbott <connor.w.abbott@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Connor Abbott 2015-07-21 19:54:32 -07:00 • committed by Kenneth Graunke
parent 58a360c6b8
commit d356f84d4c
1 changed files with 48 additions and 0 deletions
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48
src/glsl/nir/nir_control_flow.c
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@ -394,6 +394,54 @@ split_block_before_instr(nir_instr *instr)
return new_block;
}
/* Splits a basic block at the point specified by the cursor. The "before" and
* "after" arguments are filled out with the blocks resulting from the split
* if non-NULL. Note that the "beginning" of the block is actually interpreted
* as before the first non-phi instruction, and it's illegal to split a block
* before a phi instruction.
*/
static void
split_block_cursor(nir_cursor cursor,
nir_block **_before, nir_block **_after)
{
nir_block *before, *after;
switch (cursor.option) {
case nir_cursor_before_block:
after = cursor.block;
before = split_block_beginning(cursor.block);
break;
case nir_cursor_after_block:
before = cursor.block;
after = split_block_end(cursor.block);
break;
case nir_cursor_before_instr:
after = cursor.instr->block;
before = split_block_before_instr(cursor.instr);
break;
case nir_cursor_after_instr:
/* We lower this to split_block_before_instr() so that we can keep the
* after-a-jump-instr case contained to split_block_end().
*/
if (nir_instr_is_last(cursor.instr)) {
before = cursor.instr->block;
after = split_block_end(cursor.instr->block);
} else {
after = cursor.instr->block;
before = split_block_before_instr(nir_instr_next(cursor.instr));
}
break;
}
if (_before)
*_before = before;
if (_after)
*_after = after;
}
/**
* Inserts a non-basic block between two basic blocks and links them together.
*/