[all-commits] [llvm/llvm-project] acac29: [DAGCombiner] Don't fold FCOPYSIGN vector sign ope...
Luís Marques via All-commits
all-commits at lists.llvm.org
Wed Feb 10 06:26:35 PST 2021
Branch: refs/heads/main
Home: https://github.com/llvm/llvm-project
Commit: acac29ca4250281358ccdf6a258597a68999cd2d
https://github.com/llvm/llvm-project/commit/acac29ca4250281358ccdf6a258597a68999cd2d
Author: Luís Marques <luismarques at lowrisc.org>
Date: 2021-02-10 (Wed, 10 Feb 2021)
Changed paths:
M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
M llvm/test/CodeGen/AArch64/vector-fcopysign.ll
M llvm/test/CodeGen/X86/combine-fcopysign.ll
Log Message:
-----------
[DAGCombiner] Don't fold FCOPYSIGN vector sign operand casts
Avoid doing the following combine for vector types:
```
copysign(x, fp_extend(y)) -> copysign(x, y)
copysign(x, fp_round(y)) -> copysign(x, y)
```
That combine seemed to impede the selection of vector instruction and cause
a mess in some circumstances.
Differential Revision: https://reviews.llvm.org/D96037
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