| Issue |
175162
|
| Summary |
[X86] X86TTIImpl::instCombineIntrinsic - attempt to use llvm::computeKnownFPClass to generalise SSE/AVX FP scalar MAX/MIN intrinsics
|
| Labels |
good first issue,
backend:X86,
llvm:instcombine
|
| Assignees |
|
| Reporter |
RKSimon
|
Followup to #173270, with suitable DemandedElts masks we can handle the scalar intrinsics:
```
x86_sse_max_ss
x86_sse_min_ss
x86_sse2_max_sd
x86_sse2_min_sd
```
However, these will require special expansion to 2*extractelement/maxnum/insertelement as only the lowest element is actually called and the upper elements are passed through from the first operand:
https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#text=_mm_max_ss&ig_expand=4391,4391
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