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[SelectionDAG] Don't scalarize vector fpround sources that don't need it. #2764

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Merged
merged 1 commit into from
Mar 30, 2021

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ornata
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@ornata ornata commented Mar 30, 2021

… it.

Similar to the workaround code in ScalarizeVecRes_UnaryOp, ScalarizeVecRes_SETCC
, ScalarizeVecRes_VSELECT, etc.

If we have a case like this:

define <1 x half> @func(<1 x float> %x) {
  %tmp = fptrunc <1 x float> %x to <1 x half>
  ret <1 x half> %tmp
}

On AArch64, the <1 x float> is legal. So, this will crash if we call
GetScalarizedVector on it.

Differential Revision: https://reviews.llvm.org/D98208

… it.

Similar to the workaround code in ScalarizeVecRes_UnaryOp, ScalarizeVecRes_SETCC
, ScalarizeVecRes_VSELECT, etc.

If we have a case like this:

```
define <1 x half> @func(<1 x float> %x) {
  %tmp = fptrunc <1 x float> %x to <1 x half>
  ret <1 x half> %tmp
}
```

On AArch64, the <1 x float> is legal. So, this will crash if we call
GetScalarizedVector on it.

Differential Revision: https://reviews.llvm.org/D98208
@ornata
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ornata commented Mar 30, 2021

@swift-ci please test

@ornata ornata merged commit 960fd47 into apple/stable/20210107 Mar 30, 2021
@ornata ornata deleted the fix-fp-round-20210107 branch March 30, 2021 23:53
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