| Issue |
143140
|
| Summary |
[X86] lowerBuildVectorAsBroadcast - remove constant handling
|
| Labels |
backend:X86
|
| Assignees |
|
| Reporter |
RKSimon
|
Prematurely converting uniform constants to constant pool VBROADCAST_LOAD nodes can prevent further optimizations, but also results in codegen problems such as immediately spilling broadcasted constants (#30679).
X86FixupVectorConstants can handle converting constant loads to broadcasts and other datasize saving formats, including if they are load-folded into a AVX512 instruction.
But without lowerBuildVectorAsBroadcast we are missing OptSize handling - we need some way to unfold constant pool loads that X86FixupVectorConstants would be able to handle if it would reduce total data/code size - this could possibly be performed by MachineLICM which already does similar unfolds.
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