| Issue |
63435
|
| Summary |
[VE] Inefficient code for icmp i128
|
| Labels |
|
| Assignees |
|
| Reporter |
efriedma-quic
|
As discussed on https://reviews.llvm.org/D151358, the VE backend generates inefficient code for something like the following:
```
target triple = "ve"
define i64 @f(i64 %x, i64 %y, i128 %a, i128 %b) {
%c = icmp ugt i128 %a, %b
%d = select i1 %c, i64 %y, i64 %x
ret i64 %d
}
```
This currently generates 8 instructions, but it can be done in 4 instructions. We currently use 4 extra instructions to translate the result of cmpu into a boolean.
With D151358, this also impacts the efficiency of i128 smin/smax/umin/umax.
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