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Signed-off-by: Emil Velikov <[email protected]>
Acked-by: Matt Turner <[email protected]>
Acked-by: Jose Fonseca <[email protected]>
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When Connor originally drafted NIR, he copied the same function+overload
system that GLSL IR had with a few names changed. However, this
double-indirection is not really needed and has only served to confuse
people. Instead, let's just have functions which may not have unique names
and may or may not have an implementation. If someone wants to do overload
resolving, they can hav a hash table based function+overload system in the
overload resolving pass. There's no good reason to keep it in core NIR.
Reviewed-by: Connor Abbott <[email protected]>
Acked-by: Kenneth Graunke <[email protected]>
ir3 bits are
Reviewed-by: Rob Clark <[email protected]>
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Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>
Reviewed-by: Eduardo Lima Mitev <[email protected]>
Cc: [email protected]
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Some loops may have phi nodes that look like:
foo = ...
loop {
bar = phi(foo, bar)
...
}
in which case we can remove the phi node and replace all uses of 'bar'
with 'foo'. In particular, there are some L4D2 vertex shaders with loops
that, after optimization, look like:
/* succs: block_1 */
loop {
block block_1:
/* preds: block_0 block_4 */
vec1 ssa_2195 = phi block_0: ssa_2136, block_4: ssa_994
vec1 ssa_7321 = phi block_0: ssa_8195, block_4: ssa_7321
vec1 ssa_7324 = phi block_0: ssa_8198, block_4: ssa_7324
vec1 ssa_7327 = phi block_0: ssa_8174, block_4: ssa_7327
vec1 ssa_8139 = intrinsic load_uniform () () (232)
vec1 ssa_588 = ige ssa_2195, ssa_8139
/* succs: block_2 block_3 */
if ssa_588 {
block block_2:
/* preds: block_1 */
break
/* succs: block_5 */
} else {
block block_3:
/* preds: block_1 */
/* succs: block_4 */
}
block block_4:
/* preds: block_3 */
vec1 ssa_994 = iadd ssa_2195, ssa_2150
/* succs: block_1 */
}
where after removing the second, third, and fourth phi nodes, the loop becomes
entirely dead, and this patch will cause the loop to be deleted entirely.
No piglit regressions.
Shader-db results on bdw:
instructions in affected programs: 5824 -> 5664 (-2.75%)
total loops in shared programs: 2234 -> 2202 (-1.43%)
helped: 32
Reviewed-by: Matt Turner <[email protected]>
Signed-off-by: Connor Abbott <[email protected]>
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Reviewed-by: Thomas Helland <[email protected]>
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This removes phi nodes whose sources all point to the same thing.
Shader-db results:
total NIR instructions in shared programs: 2045293 -> 2041209 (-0.20%)
NIR instructions in affected programs: 126564 -> 122480 (-3.23%)
helped: 615
HURT: 0
total FS instructions in shared programs: 4321840 -> 4320392 (-0.03%)
FS instructions in affected programs: 24622 -> 23174 (-5.88%)
helped: 138
HURT: 0
Reviewed-by: Jason Ekstrand <[email protected]>
Tested-by: Jason Ekstrand <[email protected]>
Signed-off-by: Connor Abbott <[email protected]>
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