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i965/vec4: prevent copy-propagation from values with a different type size

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Because the meaning of the swizzles and writemasks involved is different,
so replacing the source would lead to different semantics.

Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Iago Toral Quiroga 2016-06-16 13:41:48 +02:00 • committed by Samuel Iglesias Gonsálvez
parent 0fec5e9867
commit 70cc6b0a02
1 changed files with 7 additions and 0 deletions
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7
src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
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@ -324,6 +324,13 @@ try_copy_propagate(const struct gen_device_info *devinfo,
value.file != ATTR)
return false;
/* If the type of the copy value is different from the type of the
* instruction then the swizzles and writemasks involved don't have the same
* meaning and simply replacing the source would produce different semantics.
*/
if (type_sz(value.type) != type_sz(inst->src[arg].type))
return false;
if (devinfo->gen >= 8 && (value.negate || value.abs) &&
is_logic_op(inst->opcode)) {
return false;