[llvm] [LoongArch] Fix fp_to_uint/fp_to_sint conversion errors for lasx (PR #137129)

[via llvm-commits]

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@@ -31,9 +31,9 @@ define void @fptoui_v4f64_v4i32(ptr %res, ptr %in){
 ; CHECK-LABEL: fptoui_v4f64_v4i32:
 ; CHECK:       # %bb.0:
 ; CHECK-NEXT:    xvld $xr0, $a1, 0
+; CHECK-NEXT:    xvftintrz.lu.d $xr0, $xr0
 ; CHECK-NEXT:    xvpermi.d $xr1, $xr0, 238
-; CHECK-NEXT:    xvfcvt.s.d $xr0, $xr1, $xr0
-; CHECK-NEXT:    xvftintrz.w.s $xr0, $xr0
+; CHECK-NEXT:    xvpickev.w $xr0, $xr1, $xr0
 ; CHECK-NEXT:    vst $vr0, $a0, 0
----------------
heiher wrote:

LGTM.

```
d: float64
l: int64

*a1: d0, d1, d2, d3 // (little-endian)
xr0: d3, d2, d1, d0 // xvld $xr0, $a1, 0
xr0: l3, l2, l1, l0 // xvftintrz.lu.d $xr0, $xr0
xr0: {l3h,l3l}, {l2h,l2l}, {l1h,l1l}, {l0h,l0l}
xr1: l3, l2, l3, l2 // xvpermi.d $xr1, $xr0, 238
xr1: {l3h,l3l}, {l2h,l2l}, {l3h,l3l}, {l2h,l2l}
xr0: l3l, l2l, l3l, l2l, l3l, l2l, l1l, l0l // xvpickev.w $xr0, $xr1, $xr0
vr0: l3l, l2l, l1l, l0l // vst $vr0, $a0, 0
*a0: l0l, l1l, l2l, l3l // (little-endian)
```

https://github.com/llvm/llvm-project/pull/137129